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 |

Power driver (CB8950E)
With an output of 7.5 W at 110 V this circuit was found in a 1968 Motorola documentation. The circuit has...
Isolator Using na Optocoupler (CB431)
This circuit isolates na áudio signal or digital signal up to 100 kHz, applying it to a gain 10...
Tuner with MOSFET (CB6914E)
This circuit serves as a reference for the components used and the time. The circuit is from 1967...