12 V x 700 mA variable power supply (CB8676E)

This circuit was found in a 1967 Electronics World. Transistor Q1 can be a TIP321 and Q2 can be a BC558. The indicator lamp is optional.

| Clique na imagem para ampliar |

Audio Leveler (CB6481E)
This circuit was found in an Experimenters Handbook of the 1990s. The purpose of this circuit is to...
49 MHz Receiver (CB18072E)
Signals from old cordless phones can be picked up with this circuit. L1 has 10 to 20 turns of 32...
Series LC Oscillator (CB24027E)
This emitter-coupled transistor LC oscillator circuit was found in the May 1970 issue of Radio...