How to Activate Relay using Transistor Circuit Diagram For reasons that have little to do with the static calculations in the other answers, I would use a beefier transistor such as the 600mA 2N4401 or a MOSFET. Switching an inductive load is harder on the transistor than switching a resistive load, even with the diode. At some point the full relay coil current is flowing through the transistor for a short period of time with more than 12V across How to increase the gain Figure 4 is the relay driver circuit that has increasing gain up. In case that very low input current from a digital circuit. We will see that this circuit we use the transistor as a Darlington compound to replace two transistors. In this post we learn how to design and buld a simple transistor relay driver circuit by correctly calculating the transistor driver circuit.
This video will show how to make a relay driver circuit or simple relay driver or how to use relay .It will provide the complete connection diagram and explanation of the circuit. How a typical transistor based relay control circuit works on appliance and HVAC control boards. Detailed information about the transistor driver circuitry, how it interfaces to a microcontroller A pretty good deal for the microcontroller. How a Relay Driver Circuit Works The bipolar transistor based driver circuitry makes use of the transistor´s cutoff and saturation mode to control the relay. In other words, the transistor is used as a ¨switch¨.
Relay Driver Circuits Circuit Diagram
During the transition of light/temperature levels, the relay clicks which may cause sparking of contacts. By using a simple tip, this problem can be avoided. Below is the circuit of a relay driver using the NPN transistor BC 548. The relay is connected between the positive rail and the collector of the transistor. An electronic circuit will normally need a relay driver using a transistor circuit stage in order to converter it's low power DC switching output into a high power mains AC switching output.
