This circuit uses two relays that switch when the voltage exceeds the value given by zener D2. The circuit is from a Radio Electronics magazine from April 1975.
Using the ICM7556, dual CMOS version of the 555, this circuit generates triangular signals from 1 to...
With this shield circuit, you can control LEDs from an AND gate or microcontroller. When both...
This circuit is from an American publication from the 60's. The power is on the order of 600 mW....