Power Darlington Stage (CB22365E)

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

LM741 Second-Order Low-Pass Filter (CB25931E)
This circuit was found in the May 1989 issue of Radio Electronics magazine. The components can be...
1 kHz High Pass Filter (CB24267E)
Using the 741 this basic circuit was found in the November 1973 Radio Electronics magazine. The...
Capacitive Transducer Amplifier (CB10564E)
This circuit came out in an English magazine from 1977, but it can be easily assembled today, as...