In this quick Arduino tutorial I will explain how you can control a relay using the Arduino Board, one 1K and one 10K resistors, 1 BC547 transistor, one 6V or 12V relay, one 1N4007 diode and a 12V fan ...

This prevents A17 Q3 from discharging the +160 volt supply into the A1through A12 Q2 transistors. The coil in the added relay is paralleled with the coil of K4, through a 120 ohm 2 watt resistor as ...

The diagram below is the relay driver circuit with Snap Acting for the clean switching of the relay. When the input signal at the base of T1 decreases, it turns off allowing T2 to conduct by giving ...

This, in turn, switches on the transistor and the following relay, with the relay coil supply to the slave I/O boards restored. So during power-on and power-off transient, this circuit minimizes ...