Any high-gain Darlington transistor can be used on this touch circuit. The load can be formed by LEDs and the power supply isolated from the power grid.
This circuit from a 1967 publication turns a short pulse into a square signal whose duration...
This circuit was obtained in the publication 101 Electronic Projects of 1979. The circuit can also...
n be assembled with BC558 transistors for low power transistors and a BD136 for the output. The...