Oscillator HA7210 (CB22402E)

This circuit is from an old documentation and can be used to generate signals in different frequency bands.

Portable Amplifier (CB1399E)
This circuit is of an old Argentine magazine of the 70's. The difficulty for its assembly is in...
Regenerative detector (CB20559E)
This circuit for a receiver was found in an English documentation from 1963. The transistor is made of...
Headlight indicator 555 (CB9118E)
This circuit warns when the headlight bulb is on. We found it in a Popular Electronics from the...