This 90s Motorola circuit from, has current limiting foldback. The power transistor is from the era, and equivalents can be used. The output is 250 V.
This PWM control was obtained in an English publication in 1989. Transistor Q2 can be the TIP42 for...
This circuit can be used to add a delay to a logic signal as shown by the input and output...
We find this microphone voice effect in 1992 documentation. The vibration of the relay contacts...