This timer with two unijunction transistors and one SCR was found in an American documentation from 1964. The unijunction transistors could be the 2N2646.
With this circuit it is possible to monitor the charge and discharge of a battery. The circuit is...
This high pass filter was found in the February 1996 Electronics Now magazine. The circuit...
This automatic nickel-cadmium or NiCad battery charger was found in European documentation from...