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.
Unlike the previous one, this circuit uses only one resistor in the base polarization. The...
We found this circuit in an English documentation from the 80's. Transistors can be modern...
Found in the August 1970 Radio Electronics magazine, this circuit uses a CA3018 with the trigger...