This circuit, which controls both the temperature and the level of a liquid in a reservoir, was found in an Electronic Design from the 90s. The circuit is based on a double 555.
Interval pulses emitted by this circuit are picked up in a medium wave radio nearby. The circuit is...
This 1970s RCA circuit can be triggered by light or dark, depending on how the LDR is connected....
This circuit, which provides a power of up to 3.5 W, can be supplied with voltages from 9 to 14 V....