Found in old documentation, this circuit can use modern equivalent components. The signal has good strength thanks to the use of a power transistor. The Q1 transistor is a unijunction of the time.
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...