This circuit was found in Electronics Today International of the 80's. The circuit uses still common components, providing the indication through LEDs.
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...