This interesting digital counter with relays with complementary outputs was found in the Radio Electronics magazine of October 1961. The supply voltage is in accordance with the relays used.
The figure shows how to implement a filter against interference caused by the switching of a...
The pulses applied to input C of the SAA1027 integrated circuit determine the engine speed. Each...
This circuit was obtained from an old publication from 1974 but can still be assembled with some...