Transistor Amplifiers continued

Here a design from 1992 after Andre Schmeets published in Elektor employing modern plastic transistors. The schematics show a class AB amplifier design incorporating most modern knowledge and techniques, like "feedforward" in the final section.  

The BF 869/870 can best be replaced by special Toshiba transistors. The amplifier can deliver 250 Watts clean output power. Many commercial class AB amps are based on this schematic principle. The feedforward section can be omitted, distortion goes up in that case.

Look here how this amplifier is set up.

Click here to goto page 7 of this section

©Hans Hilberink PE1MMK 10-09-2001.