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.
We found this symmetrical regulator in a documentation from the 70s. The circuit uses components...
This circuit was found in a 1995 documentation. It drives a set of sequential LEDs from the sound...
This sophisticated remote field strength meter circuit was found in a 73 magazine for radio...