Found in a 90s Radio Electronics, this circuit uses a ceramic capacitor (C1) as a sensor. The operational amplifier is a double 741 of the time.
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...