Showing posts with label 100W up. Show all posts
Showing posts with label 100W up. Show all posts
Sunday, July 15, 2007
100W RMS Amplifier
100W RMS Amplifier
This is a 100 watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost.Wednesday, May 30, 2007
300W Power Amplifier OCL by transister
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.
Read more and View Circuit
300W Power Amplifier OCL by transister
Tuesday, May 29, 2007
circuit power amp OTL 100W by transistor 2N3055 (with PCB)
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
Monday, April 30, 2007
100W OCL Amplifier circuit by A1215 / C2921
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