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.
We found this shield circuit in a 1991 technical documentation. The phototransistor can be...
January 2017 - Texas Instruments is making available through Mouser Electronics the new Buck...
The figure shows how to obtain a locking relay for an alarm circuit with sensors in series and in...