Power Amplifier

Mini Audio Amplifier circuit by BC559-BC549

2010-04-15T21:00:00.000-07:00

This is very small audio amplifier circuit which can be handled just with 1.5V DC battery. This circuit just need very small power to work.
The maximum output current is IP=VP/RL=62,5mA. If the transistor beta is B=150 then the maximum base current is about 400µA. This is quite much for an amplifier input so a preceding stage is very useful. IC designers normally would even build a 3 or 4 stage amplifier (and e.g. a 20 transistor bias circuit), but our PA should be as simple as possible. For maximum power gain in a direct coupled (best for low component count) amplifier the common emitter configuration is best suited, and a CB or CC stage is much worse. At low voltages a CC also has the disadvantage that the output voltage smaller than the input voltage by VBE. If you want to drive a CE stage from a CC stage you need an input voltage of 2·VBE»1,4V, which is nearly impossible form a single cell supply. Two CE stages are much easier to connect, but this makes feedback more difficult because the total amplifier will be noninverting. A solution will be a differential pair which has nearly the same characteristics like a single CE stage but features an inverting and a noninerting input. A further advantage is that the inherent temparature compensation makes the biasing more stable.

Source: http://www.weberconnect.de/nfpa2.htm

Digital Volume Control circuit with DS1669

2010-04-15T20:58:00.000-07:00

This is digital volume control circuit which uses DS1669 as the main volume control. This is stereo volume control, you can use stereo push button switch for to control both channel by together.

source: http://audio-circuits.blogspot.com/2009/10/digital-volume-control-circuit-with.html

Laptop Speakers - USB, Portable, Compact, Travel Speaker for PC and Mac - B-Flex 2 Hi-Fi Stereo USB Speaker (Black)

2010-02-02T08:10:00.000-08:00

BUY Laptop Speakers - USB, Portable, Compact, Travel Speaker for PC and Mac - B-Flex 2 Hi-Fi Stereo USB Speaker (Black)

Portable, powerful sound from any USB port

Need better sound from your laptop? The stylish new B-Flex is a compact stereo speaker on a USB flex cable for laptops and desktops. Plug and play for PC and Mac with no batteries or wires. Easy to use, great for travel, mp3 players, DVDs, presentations, and gaming. Features dual 1 watt digital amps and 2 full range paper cone micro drivers for crystal clear sound. The B-Flex digital circuitry even works on computers without sound cards.

The patented flex design allows you to position the speaker for optimum listening enjoyment. The only product of its kind, the B-Flex has been featured in the New York Times, on ABC News, on Gizmodo, and on virtually every gadget site in the world. WIRED magazine says the B-Flex "puts laptop speakers to shame."

160W Mosfet power amplifier by K134+J49

2008-07-11T22:32:00.000-07:00

This the circuit mosfet power amplifier OCL 160Watt sizes are full RMS. For 8ohm size loudspeakers build to sing bail 18 inch sizes well. By use mosfet cherished possession pair the last classic 2SK134 and 2SJ49 then have the durability is superb. Read More

Power Amplifier VMOS OTL 10 Watt by BC512

2008-06-29T21:45:00.000-07:00

Hello! This the circuit amplifies small-sized.it uses the equipment VMOS , number BD512 and BD522. which be pillar heart of the circuit. By it very the circuit is the character of OTL , make build easy and the price economizes. It is giving watt about 10W

Read more and view big size circuit

Simple Phono Preamplifier

2008-06-28T06:59:00.000-07:00

Simple circuitry suitable for moving-magnet cartridges Passive high-frequency equalization. This simple but efficient circuit devised for cheap moving-magnet cartridges, can be used in connection with the audio power amplifiers shown in these webpages, featuring low noise, good RIAA frequency response curve, low distortion and good high frequency transients behavior due to passive equalization in the 1 to 20KHz range. Transistors and associated components provide ±18V supply to the op-amp, improving headroom and maximum output voltage.

Source:http://www.redcircuits.com//Page10.htm

Soundblaster Preamp

2008-06-28T06:57:00.000-07:00

The Sound Blaster 16 PCI and Sound Blaster 16 ISA do not have a very sensitive microphone input. This little one transistor amplifier is powered directly from the microphone jack on the sound card and has LOTS of gain. Just put a 100uF bypass capacitor in parallel with the diode to increase gain even more.

Source: http://members.shaw.ca/novotill/SoundBlasterPreamp/index.htm

Subminiature 40W Stereo Audio Amplifier Module Kit

2008-06-22T01:57:00.001-07:00

The UAM4 is the big brother to Ramsey's extremely popular UAM2. It uses the latest spread spectrum amplifier technology to bring you clear, crisp, high-power audio without any of the heat which is normally associated with such an amplifier.

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10-14W Class A amplifier by TIP3055

2008-06-20T06:32:00.000-07:00

I have built this amplifier and it does sound good. It requires a preamp as it hasn’t got much gain. It requires big heat sinks and a large transformer and a great power supply and careful wiring, but in the end it is extremely simple and it sounds very good.
...

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Power Amplifier Class A 25W

2008-06-20T06:27:00.001-07:00

Musical Fidelity would let you believe that this is a Class A design. However, in common with most commercial amplifiers, it is a class AB amplifier - it simply has a rather high standing current in the output stage, which results in the first 8 watts or so being class A.
...
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Power Amplifier Class A 25W

2008-06-20T06:27:00.000-07:00

200W MOSFET Amplifier Hifi audio powerhouse

2008-06-18T00:05:00.000-07:00

A compact audio powerhouse ideal for guitar or PA work or for use as a general-purpose subwoofer or hifi amplifier. Many people prefer Mosfets because of their legendary ruggedness. Altronics had a Mosfet amplifier module which produced 200W into a 4 Ohm load and so we decided to take a look it.

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Power Amplifier MOSFET HI-FI 300W by 2SK1058, 2SJ162

2008-06-18T00:02:00.000-07:00

The amplifier consists of two completely separate monaural amplifiers each channel has its own power supply, resulting in zero inter-channel cross talk, a common phenomenon in amplifiers sharing the same power supply. In order to obtain the full output power each supply transformer should be rated at 40VAC - 0 - 40VAC at 640VA.

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50 Watt Amplifier with ICL8063 and 2N3055

2008-06-13T11:58:00.000-07:00

This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source.

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Power Amplifier with STK40xx Series Module

2008-06-13T11:56:00.000-07:00

The series STK40xx is power amplifiers in completed form in a nutshell. They are characterized by the very good quality of sound and their low price. It is easy we make a power amplifier using only few external components.

...
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Stereo Headphone Amplifier

2008-05-31T20:37:00.000-07:00

Both halves of the circuit are identical. Both inputs have a dc path to ground via the input 47k control which should be a dual log type potentiometer. The balance control is a single 47k linear potentiometer, which at center adjustment prevents even attenuation to both left and right input signals. If the balance control is moved towards the left side, the left input track has less resistance than the right track and the left channel is reduced more than the right side and vice versa. The preceding 10k resitors ensure that neither input can be "shorted" to earth.

Source: http://english.cxem.net/amplifier/amplifier59.php

Class-A 100W Amplifier

2008-05-31T20:30:00.000-07:00

A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker. This circuit developed out of my 30+ years of JLH class-A based investigations. The original 'simple' 1969 JLH class-A design provided excellent first cycle accuracy through mid and high frequencies (dynamic clarity) because there were no stabilisation components nor a series output choke, whilst the NFB error correction was established via the input emitter (some describe this as current feedback).

Source: http://english.cxem.net/amplifier/amplifier31.php

10 Watt Guitar Amplifier

2008-05-31T20:29:00.000-07:00

The aim of this design is to reproduce a Combo amplifier of the type very common in the 'sixties and the 'seventies of the past century. It is well suited as a guitar amplifier but it will do a good job with any kind of electronic musical instrument or microphone. 5W power output was a common feature of these widespread devices due to the general adoption of a class A single-tube output stage (see the Vox AC-4 model). Furthermore, nowadays we can do without the old-fashioned Vib-Trem feature frequently included in those designs. The present circuit can deliver 10W of output power when driving an 8 Ohm load, or about 18W @ 4 Ohm.

Source: http://english.cxem.net/amplifier/amplifier16.php

Ultra-low quiescent current AF power amplifier

2008-05-31T20:25:00.000-07:00

This is an audio power amplifier, similar to what is common in transistor radios and other portable audio equipment. This circuit however, has an ultra- low quiescent current of about 250uA, due to a unique bias circuit. I don’t even know of a chip that does that. This circuit also has much higher open-loop gain, due to the bootstrap effect that the circuit provides as a by-product of its operation.

Source: http://discovercircuits.com/Andy/Ultra.pdf (good site)

TBA820 Amplifier

2008-05-06T23:06:00.000-07:00

A very useful audio amp in an 8-pin DIL package. The IC features a very low minimum working supply voltage of 3V, low quiescent current, good ripple rejection, no crossover distortion and low power dissipation. ...
Link : TBA820 Amplifier

Phono Preamps For All

2008-02-13T19:40:00.000-08:00

This is a collection of phono (black vinyl for the youngsters) preamps and equalisation circuits, one of which is sure to meet your requirements. These are not my circuits, but were contributed by a reader (see above), so I am not really in a position to make any specific recommendations. They are provided as a service to the experimenters out there, and may be found useful for other applications as well.

Source: http://sound.westhost.com/project25.htm

Intercom preamp - Universal high quality preamp

2008-02-13T18:26:00.000-08:00

The circuit is so simple that there is little to say about it, but it gives very good results. Tr1 is operated in grounded base mode with input to its emitter to give low impedance input. The values shown give correct operation from 9v. If operating from other voltages you may wish to alter the 1K8 resistor to give symmetrical clipping at high levels. The third circuit is one I was working on as I left the audio company but is seems to be potentially very useful. It should be simple to use it as a low impedance mic amp or as a high input impedance preamp for mic or, with a suitable RIAA equalization, for phono pickup or similar. It can even be used as a balanced input mic preamp.

Source:http://www.4qdtec.com/preamp.html

Audio Preamplifier with Digital Volume

2008-02-13T18:23:00.000-08:00

The circuit is a preamplifier with digital regulation intensity of sound. He is separated in three departments. In first schematic (Fig.1), is found the circuit of control of electronic potesometer. The control become from two pressing switches. The S1 (UP), that put up the intensity of sound and the S2 (DOWN), on the contrary, that lower the intensity, checking them two oscillator follow a bistable multivibrator R-S (ICIC-D), with that determined the direction of counter IC3.. The gate IC2B ensure deactivate the counter in the limits of region of regulation. With the S4 we have the possibility selecting the level of sound, in which it will come back after RESET or when we give supply in the circuit. This operation is very useful when we select null level of sound, then with switch S3 we have the possibility of going to situation MUTE, to rapid nihilism of sound.

Source : http://users.otenet.gr/~athsam/audio_preamplifier_with_digital_volume.htm

Graphic Equaliser

2008-02-08T08:59:00.000-08:00

This equaliser is designed as a preamp suitable for musical instruments - guitar, bass and keyboard in particular. Unlike most conventional graphic equalisers, each slider ranges from fully off to fully on, and not the more conventional +/-12dB or so that is normally available. As a result, there is no flat setting (other than all off!). This graphic is designed to be used to create a sound, and is not suitable for hi-fi. It may be used as an add-on unit to existing instrument amp preamps, tone controls, etc. The flexibility is extraordinary, allowing a hollow "single frequency" type sound, right through to almost any tonal variant imaginable. This is the first of several projects based on the multiple-feedback bandpass filter described in Project 63, it can be made with as many (or as few) filter sections as you want.

Source Circuit:

5 band graphic equalizer using a single IC/chip

2008-02-08T08:57:00.000-08:00

This circuit uses a single chip, IC BA3812L for realizing a 5 band graphic equalizer for use in hi-fi audio systems.The BA3812L is a five-point graphic equalizer that has all the required functions integrated onto one IC. The IC is comprised of the five tone control circuits and input and output buffer amplifiers. The BA3812L features low distortion, low noise, and wide dynamic range, and is an ideal choice for Hi-Fi stereo applica-tions. It also has a wide operating voltage range (3.5V to 16V), which means that it can be adapted for use with most types of stereo equipment.

Source circuit

Microphone pre-amp

2008-02-06T06:33:00.000-08:00

This is an image Schematic. No Description available.

Link : http://www.ee.washington.edu/circuit_archive/circuits/Micro.GIF

All transistor microphone pre-amplifier

2008-02-06T06:18:00.000-08:00

The microphone has high sensitivity in the audio range, but in the ultrasonic range, the sensitivity decreases rapidly. The receiver is very sensitive. To prevent overdriving and feedback due to the high sensitivity of the microphone in the audio range, the gain of the amplifier should be low in the audio range and increase with frequency in the ultrasonic range.

Read More Source: http://bertrik.sikken.nl/bat/preamps.htm

Zeus MOSFET Matching

2007-10-25T21:53:00.000-07:00

L200 current source mosfet matching circuit.

Use 12 volts for IC1 (STMicroelectronics L200) Vsupply.
Digital voltmeter to three decimal places at 2 to 6 volts recommended.
Current set to 500mA (higher current cause device heating).
Mount DUTs on common heatsink as per picture.
Allow reading to stabilize (about 10 seconds) before noting value.
Once close matches have been ascertained retest those matches to get best fits.

Read more source : http://www.susan-parker.co.uk/zeus-mosfet-matching-1.htm

The ORIGINAL ROCKFORD FOSGATE PUNCH AMP/ MOSFET POWER

2007-10-25T21:47:00.000-07:00

This is for a Older model ROCKFORD FOSGATE PUNCH 75 MOSFET AMPLIFIER. This holds power unlike the newer models. The Punch 75 is 37.5 watts RMS continuous power per channel into four phms with less than 05% total hormonic distortion from 20-20000 HZ.
The side shows Bass 0-18+ and Treble 0-12+.

Read more source : http://atlanta.craigslist.org/ele/453888768.html

MOSFET Integrated Amplifier

2007-10-25T21:39:00.000-07:00

This is my first attempt at building a "proper" amplifier for general use, as opposed to the Mixer-Amplifier I had made earlier. This amp was made without too much concern to cost, hence several of the approaches I've taken may be sub-optimal from the cost perspective.

Overview

Microcontroller-controlled preamplifier, with infrared remote control capability. Volume and other settings stored in battery-backed RAM.
LCD Display for volume, etc.
Three general-purpose line-level inputs, one tape input, one tape output.
70W MOSFET-based stereo power amplifier.
Headphone output.
+/-38V at 4A and +/-5V at 500mA power supplies.

Read more source : http://wiredworld.tripod.com/tronics/mosfet_amp.html

High Power, High Fidelity MOSFET Power Amplifier

2007-10-25T21:35:00.000-07:00

In various parts of The Audio Pages, I have said that I am not a fan of MOSFET power amplifiers. Well, this amp has changed my views, and I consider this to be a "reference" system in all respects. The performance is extremely good, with vanishingly low distortion levels, plenty of power, very wide full power bandwidth, and the "self protecting" nature of the MOSFETs themselves.

Read more source : http://sound.westhost.com/project101.htm

Lanzar 4000 watt 2 Channel Car AMP Mosfet POWER

2007-10-25T20:48:00.000-07:00

SPECS
2 x 1000 Watts RMS at 4 Ohms 2 x 2000 Watts Max at 4 Ohms 1 x 4000 Watts Max at 4 Ohms Bridged 2 x 1650 Watts at 2 Ohms RMS Electronic Crossover Network Bass Boost Circuit Variable Phase Shift Control 2 Ohms Stereo Stable Anti-Thump Turn-On Soft Turn On/Off High & Low Level Inputs Blue Light Illuminated Crossover Control Power & Protection LED Indicators Advanced Protection Circuitry Bass Boost Remote Control T.H.D: 0.04% S/N Ratio: 90dB Channel Separation: 65dB Frequency Response: 15Hz- 35kHz Dimensions: 10.47''W x 2.46''H x 21''L

Read more source : http://philadelphia.craigslist.org/ele/459149485.html

App Note 16 - SOA Advantages of MOSFETS

2007-10-23T08:03:00.000-07:00

App Note 16 - SOA Advantages of MOSFETS: Apex Microtechnology Cor.

AN-D26: HT04 Series: High Voltage Isolated MOSFET Driver

2007-10-23T08:02:00.002-07:00

AN-D26: HT04 Series: High Voltage Isolated MOSFET Driver: Supertex Semiconductors

AN-D15: Understanding MOSFET Data

2007-10-23T08:02:00.001-07:00

AN-D15: Understanding MOSFET Data: Supertex Semiconductors

AN898: Determining MOSFET Driver Needs for Motor Drive Applications

2007-10-23T08:01:00.001-07:00

AN898: Determining MOSFET Driver Needs for Motor Drive Applications

AN799: Matching MOSFET Drivers to MOSFETs

2007-10-23T08:00:00.002-07:00

AN799: Matching MOSFET Drivers to MOSFETs

AN798: Universal Power MOSFET Interface IC (TC4420/9)

2007-10-23T08:00:00.001-07:00

AN798: Universal Power MOSFET Interface IC (TC4420/9)

AN786: Considerations for Driving Power MOSFETs in High-Current, Switch Mode Regulators

2007-10-23T07:59:00.001-07:00

AN786: Considerations for Driving Power MOSFETs in High-Current, Switch Mode Regulators

AN763: Latch-Up Protection for MOSFET Drivers

2007-10-23T07:58:00.001-07:00

AN763: Latch-Up Protection for MOSFET Drivers

AN-6005 / Synchronous buck MOSFET loss calculations with Excel model

2007-10-23T07:57:00.000-07:00

AN-6005 / Synchronous buck MOSFET loss calculations with Excel model

AN-558: Introduction to Power MOSFETs and Their Applications

2007-10-23T07:56:00.000-07:00

AN-558: Introduction to Power MOSFETs and Their Applications: National Semiconductor.

AN18 Power MOSFET Gate Driver Circuits using High Current Super-b Transistors: 6A Pulse Rated SOT23 Transistors for High Frequency MOSFET Interfacing

2007-10-23T07:54:00.000-07:00

AN18 Power MOSFET Gate Driver Circuits using High Current Super-b Transistors: 6A Pulse Rated SOT23 Transistors for High Frequency MOSFET Interfacing: Zetec Semiconductors A description of the MOSFET converter circuits' requirement for a high current buffer stage, a suggested range of Zetex high current capable, fast switching transistors, and circuit examples.

AN10 Automotive Relay Drivers using the Zvn4206av: Protection Free Interfacing with Avalanche Rated MOSFETs

2007-10-23T07:52:00.000-07:00

AN10 Automotive Relay Drivers using the Zvn4206av: Protection Free Interfacing with Avalanche Rated MOSFETs: Zetec Semiconductors An alternative solution is provided to the usual large package Darlington effected relay driver. The ZVN4206AV has been designed, processed and rated to withstand significant energy within the breakdown region. This allows the part to absorb back-emf and transient energy, thereby allowing lower component count circuits.

Amplify and Shift EPAD MOSFET Output with an Operational Amplifier

2007-10-23T07:51:00.000-07:00

Amplify and Shift EPAD MOSFET Output with an Operational Amplifier: Circuit Ideas for Designers Advanced Linear Devices, Inc.

Ampli MOSFET

2007-10-23T07:49:00.000-07:00

Ampli MOSFET : DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms

Advanced Polarity Protection with MOSFETs

2007-10-23T07:47:00.000-07:00

Advanced Polarity Protection with MOSFETs: Advanced Power Switching and Polarity Protection for Effects

AB-15 / Using Surface Mount Power MOSFETs in Processor Power Supplies

2007-10-23T07:46:00.000-07:00

AB-15 / Using Surface Mount Power MOSFETs in Processor Power Supplies

A 300w MOSFET Linear Amplifier for 50 Mhz

2007-10-23T07:45:00.001-07:00

A 300w MOSFET Linear Amplifier for 50 Mhz: Advanved Power Technology - APT980

25 Watt MOSFET Amplifier

2007-10-23T07:38:00.000-07:00

25 Watt MOSFET Amplifier: High Quality simple unit. No need for a Preamplifier

2N2222 40 Meter CW/DSB Tranceiver

power Redefined

2007-10-23T07:31:00.000-07:00

The Hx350 is the epitome of power.

With 10 pieces of IRFP240/9240, it is capable of delivering an astounding 600Watts/RMS into 4 W (before clip).

But the Hx350 is more than raw power. It's about the quality of Watts. It has none of the edginess and harshness that proamps are notorious for. When used in the home, the Hx350 is ideally suited for high powered subwoofers or power hungry main speakers.

The Hx350 is the only amplifier in AmpsLab with our Loudspeaker Protection Circuitry (DCpro Kit) on board.

Read more source : http://www.ampslab.com/hx350.htm

Lateral Mosfets

2007-10-23T07:27:00.000-07:00

The Lm60 uses a pair of highly acclaimed Hitachi Lateral Mosfets 2SK1058 & 2SJ162 for the current stage.

These mosfets are reputed to be the only transistors manufactured solely for audio applications. Unlike normal power transistors, the Hitachi Mosfets do not suffer from Secondary Breakdown. Best of all, they are immune to Thermal Runaway.

In musical reproduction, the Lm60 is probably the sweetest sounding amplifier in AmpsLab. Highly recommended for tube aficionados who are migrating to solid state.

Read more source : http://www.ampslab.com/lm60.htm

Switching Mosfets

2007-10-23T07:16:00.000-07:00

The new generation of Switching Mosfets, IRFP240/9240, are making sweeping changes in power amplification.

Since these mosfets do not suffer from Secondary Breakdown, they are fast gaining reputation as the preferred choice in the professional industry.

The Hx series in AmpsLab takes full advantage of this new technology. We highly recommend our Hx amplifiers for Home Theater Systems.The new generation of Switching Mosfets, IRFP240/9240, are making sweeping changes in power amplification.

Read more source : http://www.ampslab.com/hx100.htm

Since these mosfets do not suffer from Secondary Breakdown, they are fast gaining reputation as the preferred choice in the professional industry.

The Hx series in AmpsLab takes full advantage of this new technology. We highly recommend our Hx amplifiers for Home Theater Systems.

LM1875 Channel Stereo Power Amplifier 20 Watt

2007-09-03T01:50:00.000-07:00

LM1875 Channel Stereo Power Amplifier 20 Watt
There are many instances where a simple and reliable power amplifier is needed - rear and centre channel speakers for surround-sound, ...

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Simple Class A Amplifier 10W with MJ480

2007-09-03T01:41:00.000-07:00

10 Watt Power Amplifier:

Simple Class A Amplifier

A 10-W Design giving subjectively better results than class B transistor amplifiers

MJE3055+MJE2955 Power Amplifier 60 Watt Into 8 Ohms

2007-08-23T08:33:00.000-07:00

Introduction
This amplifier does not claim to be "state of the art", and in fact the base design is now over 20 years old. It is a simple amp to build, uses commonly available parts and is stable and reliable.
...

Link : MJE3055+MJE2955 Power Amplifier 60 Watt Into 8 Ohms

TDA2005 - Schematic audio amplifier

2007-07-29T19:07:00.001-07:00

TDA2005 - Schematic audio amplifier

Soft-Start Circuit For Power Amps

2007-07-29T18:18:00.000-07:00

When your monster (or not so monster) power amplifier is switched on, the initial current drawn from the mains is many times that even at full power. There are two main reasons for this, as follows ...

Transformers will draw a very heavy current at switch on, until the magnetic flux has stabilised. The effect is worst when power is applied as the AC voltage passes through zero, and is minimised if power is applied at the peak of the AC waveform. This is exactly the opposite to what you might expect
At power on, the filter capacitors are completely discharged, and act as a short circuit for a brief (but possibly destructive) period

These phenomena are well known to manufacturers of very high power amps used in PA and industrial applications, but 'soft start' circuits are not commonly used in consumer equipment. Anyone who has a large power amp - especially one that uses a toroidal transformer - will have noticed a momentary dimming of the lights when the amp is powered up. The current drawn is so high that other equipment is affected.

READ MORE ...

Audio power amplifier schematics

2007-07-21T09:58:00.000-07:00

Source : http://www.district87.org/staff/waltonm/CircuitAnalysis/Electronic%20circuit%20schematics.htm
Thank you

30 Watt Power Amplifier

2007-07-15T22:51:00.000-07:00

30 Watt Power Amplifier

4QD-TEC: Electronics Circuits Reference Archive
Low distortion audio amplifier

30 Watt Amplifier

2007-07-15T22:46:00.000-07:00

30 Watt Amplifier Schematic

20 Watt Power Amplifier

2007-07-15T22:42:00.000-07:00

20 Watt Power Amplifier
This IC chip was designed specifically for use in power boosting applications in automobiles.

100W RMS Amplifier

2007-07-15T22:37:00.001-07:00

100W RMS Amplifier

This is a 100 watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost.

100W RMS Amplifier

2007-07-15T22:37:00.000-07:00

100W RMS Amplifier

This is a 100 watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost.

100W Guitar Amplifier

2007-07-15T22:34:00.000-07:00

100W Guitar Amplifier Mk II
Rod Elliott (ESP)
New Version Created 27 Jan 2002

Simple Class A Amplifier 10W

2007-07-15T22:27:00.000-07:00

Simple Class A Amplifier

A 10-W Design giving subjectively better results than class B transistor amplifiers

by J. L. Linsley Hood, M.I.E.E.

HA1377 Bridge Amp BCL 17W

2007-06-05T08:26:00.001-07:00

Circuit HA1377 Bridge Amp BCL 17W

PCB HA1377 Bridge Amp BCL 17W

TDA2009 Ampl BCL 18W

2007-06-01T03:27:00.001-07:00

circuit-TDA2009 Ampl BCL (bridge amplifier) 18W ,Supply volt = 23V 2A

TDA2020 power amp 80W hi-fi

2007-06-01T03:23:00.001-07:00

circuit TDA2020 power amp 80W hi-fi
For this application the maximum value of V1 in no-load condition is +/- 45V

TDA2004 Headphone amplifier

2007-05-30T10:22:00.000-07:00

A opamp. medium power, here it�s used as amplifier of headphones with possibility drive low loads. It contains in a nutshell two amplifiers. The voltage gain, has been determined in 40dB, from the R3-4 and R11-12, for each channel, respectively. The restriction of bandwidth for each unit is regulated by the combination of R12, C2 and R13, C15, in 22KHZ. The R5, R10 attend to the adaptation of impedance earphones.

Link: TDA2004 Headphone amplifier

300W Power Amplifier OCL by transister

2007-05-30T09:43:00.000-07:00

Source :: http://users.otenet.gr/~athsam/power_amp_300w.htm

For many application there's no substitute for sheer power- low efficiency speakers, outdoor sound systems, or maybe you like the full flavour of the dynamic range of a high power amp. Whatever your requirement-this super power module should fit the bill. How it works: The amplifier can be divided into three separate parts. These are : the input stage, which consists of Q1-Q9 , a high gain, low power driver; the output or power stage- witch only has a voltage gain of four but enormous power gain; and the power supply. The input stage is a complementary -differential network, each ''side'' with its own current source. Each transistor in this stage is run at a collector currant of about 0.7mA. Emitter resistors are employed to stabilize the gain and improve linearity. The output of Q1-Q5 drives Q7 and Q9. The latter are virtually two constant-current sources run about 7mA collector current. With an input signal these ''current'' sources are modulated out of phase - the collector current of one decreases while the other increases. This configuration provides quite an amount of gain. In between the bases of these two transistors is Q8, the thermal sensing-bias transistor. The voltage across Q8 may be adjusted by TR1, thus setting the quiescent bias current for output stage. The output stage, Q10-Q11, Q13-Q14 and Q16-17, has a gain of about five, set by R44 and R28 plus R29. Diodes D4 and D6 prevent reverse biasing of Q10 and Q11 (otherwise the output would be limited). Protection of the output transistors is provided by Q12 and Q15 which monitor both current and voltage in the output transistors and bypass the base current if the limit is exceeded. Frequency stabilization provided by capacitors C6, C11, C12 and the RC networks R31/C10 plus R46/C15. Frequency response of the amplifier is set by C1 and C7 (lower limit), C6 sets the upper frequency limit. If you want use the Protection DC and Balance/Bridge circuits. All the transistors that are inside the interrupted line are placed on an aluminium corner and he screwed on a suitable heatsink. The transistors Q7,Q10,Q11, Q8, Q9, Q13,Q14,Q16 and Q17 placed on this aluminium corner, with suitable isolation from this.

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300W Power Amplifier OCL by transister

circuit power amp OTL 100W by transistor 2N3055 (with PCB)

2007-05-29T01:05:00.001-07:00

This is Circuit Power Amp OTL 100W by transistor 2N3055.
It easy to build because normal circuit power amp OTL.
To use power supply 98V 5A.
Out put power 100W at Speaker 8 OHM or 120W : 4OHM.

View circuit and PCB power amp OTL 100W by transistor 2N3055 (with PCB)
View Circuit Power Supply 98V 5A FOR power amp OTL 100W by transistor 2N3055

circuit power amp mosfet ocl 60W by K134 and J49

2007-05-29T00:51:00.001-07:00

This is circuit power amp mosfet ocl 60W, it use mosfet K134 and J49.
Out put power 60W at speaker 8 ohm or 120W at 4 ohm.
It easy circuit.
supply volt +49V gnd +49V ,Curent 3-5A.

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Super Small Amp 1.2W by IC TDA7052

2007-05-25T02:07:00.001-07:00

Pre MIC (microphone preamplifier) 3 CH by IC LM348

2007-05-25T01:55:00.001-07:00

Circuit Pre MIC (microphone preamplifier) 3 CH by IC LM348

PCB Pre MIC (microphone preamplifier) 3 CH by IC LM348

Pre Tone Control Stereo by IC NE5532

2007-05-25T01:46:00.001-07:00

Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353

2007-05-24T11:46:00.001-07:00

Circuit Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353

PCB Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353

5 Channels Graphic Equaliser by LA3600

2007-05-14T10:07:00.000-07:00

This circuit 5 Channels 2 Octave Graphic Equaliser,easy to make equalizer,
because using IC LA3600 (easy to use)
Cut at frequencies of 50Hz, 200HZ,800Hz,3.2kHz and 10kHz.
Supply voltage may be anything from +12V.

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5 Channels Graphic Equaliser by LA3600

5 Channels 2 Octave Graphic Equaliser by 4558

2007-05-14T09:57:00.000-07:00

This circuit 5 Channels 2 Octave Graphic Equaliser,easy to make equalizer,
because using IC 4558 or 1458 or LF353 (nice)
Cut at frequencies of 50Hz, 200HZ,800Hz,3.2kHz and 12kHz.
Supply voltage may be anything from -15V GND -15V for IC 4558.

View Circuit 5 Channels 2 Octave Graphic Equaliser by 4558 with PCB

TDA2005 Amplifier Car audio BCL 20W

2007-05-13T05:52:00.000-07:00

The Circuit TDA2005 Amplifier for Car audio BCL (ฺBride Amplifier) 20W.
Volt supply 11V to 14V, Power output 10W+10W#, for Speaker 2-8 ohm.

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TDA2005 Amplifier Car audio BCL 20W

TDA2004 Amplifier Car audio stereo OTL 10W+10W

2007-05-13T05:36:00.000-07:00

The Circuit TDA2004 Amplifier Car audio stereo OTL 10W+10W.
Volt supply 11V to 14V, Power output 10W+10W#, for Speaker 2-8 ohm.

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TDA2004 Amplifier Car audio stereo OTL 10W+10W

TDA2006 Amplifier audio OTL 12W with single power supply

2007-05-13T05:23:00.000-07:00

The Circuit TDA2006 Amplifier audio OTL 12W with single power supply.
Volt supply 11V to 14V, Power output 12W, for Speaker 2-8 ohm.

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TDA2006 Amplifier audio OTL 12W with single power supply

TDA2006 Amplifier audio OTL 12W

2007-05-13T05:12:00.000-07:00

The Circuit TDA2006 Amplifier audio OTL 12W.
Volt supply 11V to 14V, Power output 12W, for Speaker 2-8 ohm.

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TDA2006 Amplifier Car audio OTL 12W

TDA1910 monolithic integrated circuit.

2007-05-12T06:13:00.000-07:00

The circuit TDA1910 monolithic integrated circuit.
* 10 dB 50Hz boost tone control using change of pin 1 resistane (muting fumction)

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TDA1910 monolithic integrated circuit.

TDA1910 Sqelch function in TV

2007-05-12T06:11:00.000-07:00

The circuit TDA1910 Sqelch function in TV, INPUT Sound IF 5.5MHZ.

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TDA1910 Sqelch function in TV

TDA2003 Amplifier BCL (Low cost) 18W for CAR

2007-05-12T06:04:00.000-07:00

The Circuit TDA2003 Amplifier BCL (bridge amplifier) 18W for CAR CAR RADIO AUDIO.
Volt supply 10V-14V, Power output 18W, for Speaker 2-8 ohm.

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TDA2003 Amplifier BCL (low cost) 18W for CAR

TDA2003 Amplifier Car Audio OTL 10W

2007-05-12T05:59:00.000-07:00

The Circuit TDA2003 Amplifier BCL 10W CAR RADIO AUDIO.
Volt supply 10V-14V, Power output 8W, for Speaker 2-8 ohm.

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TDA2003 Amplifier Car Audio OTL 10W

TDA2003 Amplifier Car Audio OTL 10W

2007-05-12T05:55:00.000-07:00

The Circuit TDA2003 Amplifier OTL 10W CAR RADIO AUDIO.
Volt supply 10V-14V, Power output 8W, for Speaker 2-8 ohm.

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TDA2003 Amplifier Car Audio OTL 10W

TDA2002 Amplifier 8W CAR RADIO AUDIO

2007-05-11T21:21:00.000-07:00

The Circuit TDA2002 Amplifier 8W CAR RADIO AUDIO.
Volt supply 10V-14V, Power output 8W, for Speaker 2-8 ohm.

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TDA2002 Amplifier 8W CAR RADIO AUDIO

TDA1910 Amplifier OTL 10W - with muting

2007-05-11T21:15:00.000-07:00

The circuit TDA1910 Amplifier OTL 10W - without muting.
Volt supply 10V-14V, Power output 10W, for Speaker 2-8 ohm.

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TDA1910 Amplifier OTL 10W - with muting

TDA1910 Amplifier OTL 10W - without muting

2007-05-11T20:52:00.000-07:00

The circuit TDA1910 Amplifier OTL 10W - without muting.
Volt supply 10V-14V, Power output 5W, for Speaker 2-8 ohm.

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circuit TDA1908 Amplifier CAR AUDIO OTL 8W

2007-05-11T20:47:00.000-07:00

The circuit TDA1908 Amplifier CAR AUDIO OTL 8W.
Volt supply 10V-14V, Power output 5W, for Speaker 2-8 ohm.

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TDA1908 Amplifier CAR AUDIO OTL 8W

TDA1905 Amplifier CAR Audio OTL 5W

2007-05-11T20:38:00.000-07:00

The circuit TDA1905 Amplifier CAR Audio OTL 5W.
Volt supply 7-14V, Power output 5W, for Speaker 2-8 ohm.

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TDA1905 Amplifier CAR Audio OTL 5W

TDA1904 Audio Amplifier OTL 4W

2007-05-11T20:37:00.000-07:00

Two Microphone Preamplifier by BC109

2007-05-10T19:19:00.000-07:00

Guitar Practice Amplifier

2007-05-10T18:36:00.000-07:00

View circuit Guitar Practice Amplifier

Clipping Amplifier

2007-05-10T18:24:00.000-07:00

View circuit Clipping Amplifier

50W OCL Mosfet (K1058 + J162)

2007-05-09T16:05:00.000-07:00

The 50W OCL Mosfet (K1058 + J162) is easy to build, and very inexpensive.
To use Power Supply +35V -35V >2A.
Mosfet (K1058 + J162) must be mounted on heatsink.
Can be directly connected to CD players, tuners and tape recorders.

View Circuit and PCB 50W OCL Mosfet (K1058 + J162)

40W Amp OCL 2N3055+MJ2955

2007-05-09T16:02:00.000-07:00

The 40W Amp OCL 2N3055+MJ2955 is easy to build, and very inexpensive.
To use Power Supply +35V -35V >2A.
Transistor 2N3055+MJ2955 must be mounted on heatsink.
Can be directly connected to CD players, tuners and tape recorders.

View Circuit and PCB 40W Amp OCL 2N3055+MJ2955

35W Amplifier BCL by TDA2030

2007-05-09T15:56:00.000-07:00

The 35W Amplifier BCL by TDA2030 is easy to build, and very inexpensive,Easy to build.
To use Power Supply +15V -15V >2A.
IC TDA2030 must be mounted on heatsink.
Can be directly connected to CD players, tuners and tape recorders.

View Circuit and PCB 35W Amplifier BCL by TDA2030

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AN786: Considerations for Driving Power MOSFETs in High-Current, Switch Mode Regulators

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AN-6005 / Synchronous buck MOSFET loss calculations with Excel model

AN-558: Introduction to Power MOSFETs and Their Applications

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power Redefined

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30 Watt Power Amplifier

4QD-TEC: Electronics Circuits Reference ArchiveLow distortion audio amplifier

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300W Power Amplifier OCL by transister

circuit power amp OTL 100W by transistor 2N3055 (with PCB)

circuit power amp mosfet ocl 60W by K134 and J49

Super Small Amp 1.2W by IC TDA7052

4QD-TEC: Electronics Circuits Reference Archive
Low distortion audio amplifier