Electronic Relay (CB14743E)

This assembly is from 1957 from a Raytheon manual, but can be modernized using a BC548, 6 V power supply and common 100 mA relays.

| Clique na imagem para ampliar |

40 meters band CW transmitter (CB8730E)
We found this circuit in a 90s 73 magazine for radio amateurs. The circuit has 3 W of power and can...
VHF Modulator (CB5365E)
This circuit is from old American documentation, but the transistor used is still very common...
6W amplifier with TDA2613 2 (CB15394E)
This circuit uses a simple power source, having been found in the Philips Databook of 1990....