This circuit was found in a 90s Popular Electronics. It is used for the acoustic transmitters of 40 kHz, as several found in this section. Transistors support current equivalents.
This circuit has an interesting application. If a device with the selector switch in the 110 V...
The basic idea of this circuit is to convert the indication of a magnetic sensor to an audio tone...
This circuit can control the power from 0 to 70% of the maximum power on a load. The circuit was...