This circuit was found in the 1990 Motorola Dataar Linear. We can mount it with more modern equivalent transistors. Output transistors shall be provided with heat radiators.
This simple circuit, which requires a low current (50mA) relay for 5 to 12V power supplies, was...
We discovered this circuit in an English magazine that no longer exists. The magazine is from...
The source used in this timer is of the type without transformer and regulated by the 7 W zener. The...