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Input impedance: >30 kohm
Frequency range (-1,5dB): 10Hz ... 30kHz
Signal to noise: > 93dB
Damping factor: >50
DISTORTION @ 1kHz into 6 ohm
The amplifier is built with least amount of parts making it really simple and cheap to build. However, no compromizes are made and the final performance is surprisinly good. The 4-channel prototype shown below was in heavy use for more than 20 years as a monitor amplifier. Most of the components can be found from a multitude of manufaturers. That makes availability very good. The cost for one channel is less than 10€.
The amplifier is intended for 8 ohm speakers that it can drive with 60W of continuous power with less than 0,12% distortion. Other distortion values above. Diriving loads with a higher resistance is no problen, but when driving 4 ohm speakers must the voltage rails maximum voltage be reduced.
More coming soon...
4-channel amplifier prototype
4-channel power amplifier inner side.
Stereo version innards
Power supply Schematics
PAGE UNDER CONSTRUCTION...
PCB-layout. View is from copper (solder) side.