This circuit for audio signals was found in the March 1990 Radio Electronics magazine. The circuit uses a unusual optocoupler that can be replaced with an equivalent one.
The circuit shown in Figure bellow generates frequencies of 50 Hz, 100 Hz, and 200 Hz. The circuit uses a...
This circuit protects power supply equipment against transients coming from the power line as well as...
This circuit can be used as a shield for microcontrollers such as the Arduino. Frequency is given...