Active Antenna using IC (CB6772E)

Found in an American documentation from 1992, this circuit for medium and short waves uses a CI of the time. This component is uncommon today.

Triggered Oscillator 555 (MSB119E)
This circuit shows how to control an astable configuration using the 555 IC. The control signal is...
Continuity Tester (CB4546E)
This continuity tester for low resistances was found in an English magazine from 1978. The circuit...
FM or VHF Receiver (CB4578E)
This 1995 circuit uses an audio amplifier that is no longer common today. However, other...