Published in an old Popular Electronics, this circuit makes use of components that are still current. The circuit must be powered with 9 V and eventually adapted to function as a shield.
This counter performs the same function as the 4020, but includes an internal oscillator. The...
This circuit was obtained in a Popular Electronics of the 90s. It against a kitchen hood based on...
This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a...