This circuit operates at a frequency of 80 KHz and modulation up to 60 kHz. The circuit is from 1980s documentation. The PUT is an uncommon component today.
This integrated generates all the higher octave frequencies of a common keyboard when a clock...
This circuit was found in a Popular Electronics from the 90s. The frequency depends on the...
This circuit can be controlled by an external signal which allows its use as a shield. The circuit...