Two Transistor Super heterodyne (CB20574E)

This circuit was found in an English publication from 1967. The circuit is for listening on a phone. Transistors are types of germanium of the time.

| Clique na imagem para ampliar |

Flyback Tester (CB23812E)
This circuit appeared in a Radio Electronics magazine in March 1962. The circuit uses two...
Opto-Coupler Tester (NI0023E)
A complete test for opto-couplers can be made using the circuit Bellow. The function generator...
1 A Negative Regulator L79xx (CB15171E)
The integrated circuits of the SGS L79xx series are equivalent to those of the common 79xx series,...