2n3904 relay driver

 · The 2N is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. It is designed for low current and power, medium voltage, and can operate at moderately high speeds.  · The output coming from this optocoupler will not activate the relay directly. that’s why we have used a 2N NPN transistor at the output of this optocoupler. This transistor will receive current at its base and will be activated which drives the relay. The voltage of the relay should be the same as the operating voltage of this www.doorway.ruted Reading Time: 2 mins.  · I have a 12v relay that has a DC coil resistance measuring R, so at (12 - )v, that means about 29mA to actuate it (too much for a CMOS load without a driver). The 2N has a beta / hFE of (max), so the minimum Ib I need for saturation is 29mA / , or 96uA, though it should be higher to be www.doorway.rus: 4.

I have a 12v relay that has a DC coil resistance measuring R, so at (12 - )v, that means about 29mA to actuate it (too much for a CMOS load without a driver). The 2N has a beta / hFE of (max), so the minimum Ib I need for saturation is 29mA / , or 96uA, though it should be higher to be reliable. The output coming from this optocoupler will not activate the relay directly. that’s why we have used a 2N NPN transistor at the output of this optocoupler. This transistor will receive current at its base and will be activated which drives the relay. The voltage of the relay should be the same as the operating voltage of this circuit. Hi: I have a 5 volt relay that requires 70mA of current in order to energize the coil. I am trying to get a driver to work using a 2N transistor, a 1N diode for the flywheel and a 1KΩ resistor on the base. The emitter is grounded. I want a 5 volt level on the base to trigger the relay.

Jual pcs 2n Sot J3y S Smd Npn Transistor Mmbt（1am） Terbaru Online suitable for modern patch circuit board applications, suitable for. Design the switching circuit of Figure 3 to drive a small relay that will be provided Consult the 2N data sheet for the parameters you need in the. These simple optocoupler relay driver circuits can be used in variety of electronic drive the relay due to which we have used a 2N NPN transistor.