This powerful pushbutton uses a power MOSFET. We found it in a Popular Electronics magazine from the 90s. The MOSFET must be mounted on a heat sink.
This 1970s RCA circuit can be triggered by light or dark, depending on how the LDR is connected....
Found in a 1980s American documentation, this crystal-controlled oscillator generates 100 MHz...
This flasher circuit consists of an astable multivibrator with the frequencies given by the...