Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the FET can be equivalent and the operational is general-purpose.
This oscillator for the practice of telegraphy provides a good sound in a loudspeaker, with only...
This ultrasonic insect repellent was found in American documentation from the 1980s. The...
The short-wired circuit is suggested by National Semiconductor in documentation on the LM3909. The power...