This is a circuit that allows remote activation of a power supply. The circuit was used with a timer of the time. It appeared in the November 1973 issue of Radio Electronics magazine.
We found this circuit in a Poptronics from 1998. The circuit can be extended to more competitors...
May 2017 - Mouser Electronics already has Microchip's new MCP14A0451 and MCP14A0452 integrated...
This step of good gain was obtained in an American publication of the 1980s. The circuit can be...