80W power amplifier MJ3001 and MJ2501


Posted on Jan 29, 2013

This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like its shown in the table (from 20 W to 80 W RMS). The first thing that you must do, is to measure the end transistors (T3 and T4) amplifying coefficient, the hfe or β. If their disagreement is bigger than 30 %, the amplifier would not give a clear sound. I used MJ3001 and MJ2501 transistors, and this disagreement was around 5%.


80W power amplifier MJ3001 and MJ2501
Click here to download the full size of the above Circuit.

Before the first turning on you must short circuit the inputs of the amp, and put a mA-meter on the output, than turn the amplifier on, and tune the R13 pot, to decrease the DC current on the output, to some uA-s, or in a lucky situation to




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Stereo headphone amplifier
Tremolo
Cigar Lighter Plug to USB Power Socket
LED Emergency Light Circuit With Battery Over Charge Protection
battery meter for pinball machines
random number generator game
2 watt fm transmitter
ML7005 DTMF Transceiver ML7005DTMF Transceiver
Fully Automatic Emergency Light
Op-Amp Microphone Preamp
125 Motorcycle electronic ignition circuit diagram



Top