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.
This circuit was found in an English magazine from 1978, but it is still current, just change the...
This circuit causes a buzzer to emit an intermittent tone when the temperature sensed by the...
This microcontrolled null adjustment for operational amplifiers was obtained in a Linear...