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.
We found this protection circuit for the power supply in a 1992 documentation. This circuit has...
This circuit was found in a 1977 Signetics manual. The 556 consists of a 555 double and the...
This traditional configuration of astable was found in a 1965 documentation. Transistors can be...