This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio Electronics magazine of April 1990.
This control panel allows the use of NO and NC sensors, turning the alarm on after 30 seconds...
This project was published in the April 1989 issue of Radio Electronics magazine. It drives LEDs...
This circuit of old documentation can be implemented with modern operational amplifiers. The...