Power Darlington Stage (CB22365E)

This circuit is an alternative to using Darlington power transistors in the previous amplifier. The power is a few watts.

High Quality Headphone Amplifier (CB11998E)
This circuit is from an English magazine from 1980, but it can be easily assembled with more...
Pre-stabilization circuit (CB8802E)
Found in Philips' 1968 documentation, this circuit serves as a 6.3 V reference for high stability. |...
Isolation Circuit for RS-232 (CB23588E)
In critical applications of the RS-232 interface, the danger of induced voltages in the cables must...