This power source was found in a 1968 Electronics World. The transistors are from that time. The current of each output is limited by the transformer.
We found this circuit in the Radio Electronics magazine of December 1972. It generates signals in 6...
With the circuit shown in the figure it is possible to generate signals up to a frequency of 110...
This timer uses common components and can be used for time intervals up to a few hours. The...