1-Ttube reflex receiver (T1555E)

This one-tube circuit is equivalent to the previous one. We find it in a 1924 book by Gernsback, Power is made by batteries.

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...