This timer with two unijunction transistors and one SCR was found in an American documentation from 1964. The unijunction transistors could be the 2N2646.
This source of constant current was obtained in an American documentation of 1973. The transistors can be...
Unlike white noise, pink noise has a spectrum whose amplitude decreases with frequency. This...
This circuit was found in a 1985 English magazine, but it can still be easily assembled, as the...