Using the 2N2646 this circuit was found in a Radio Electronics magazine from July 1968. The transistors are from the time and the lamp can be replaced by a high-power LED in a current version.
This circuit was found in a 1999 documentation, but it can still be easily assembled today, as the...
This circuit, found in a 1988 documentation consisting of an audio switch that turns off the load...
Launched in 2016 but with documentation reviewed in June 2017, the Texas Instruments TLV854x...