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.
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
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
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
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
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
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.
