1940s commercial receiver (T1618E)

This receiver was found in a Radio Electronics from 1949. It is a superheterodyne of the time using 6 tubes.

700 mW amplifier with LM386 (CB966E)
This is one of the many versions of amplifiers with LM386. This was achieved in an old publication (1981). The...
5-Step Sine Wave Generator (CB24476E)
The figure shows how to generate a sinusoidal signal using 4 flip-flops. The circuit is from a...
Automatic Switch 110 V 220 V (CB17313E)
The integrated circuit, in this 1986 application, is not a very common component today. The...