25W Mosfet audio amplifier

Posted on Feb 12, 2013

Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. Output power: well in excess of 25Watt RMS @ 8 Ohm (1KHz sinewave) Sensitivity: 200mV input for 25W output Frequency response: 30Hz to 20KHz -1dB

25W Mosfet audio amplifier
Click here to download the full size of the above Circuit.

Q6 & Q7 must have a small U-shaped heatsink. Q8 & Q9 must be mounted on heatsink. Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter in series with Q8 Drain) with no input signal. A correct grounding is very important to elim

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