How to trigger a relay using transistor?

How to trigger a relay using transistor?

As well as the standard Common Emitter configuration for a relay switch circuit, the relay coil can also be connected to the Emitter terminal of the transistor to form an Emitter Follower circuit. The input signal is connected directly to the Base, while the output is taken from the Emitter load as shown.

How 5V relay works?

HOW THE 5V RELAY WORKS. The SRD-05VDC-SL-C relay has three high voltage terminals (NC, C, and NO) which connect to the device you want to control. The other side has three low voltage pins (Ground, Vcc, and Signal) which connect to the Arduino. Inside the relay is a 120-240V switch that’s connected to an electromagnet.

How do I create a 5V relay module?

Now we need to check if it is working:

1. first download the relay.
2. connect the Vcc and GND pins of the relay module to the Arduino’s 5 volt pin and gnd pin.
3. then connect the relays input pin(the pin comes from the transistor’s base pin) to the Arduino’s digital pin 13.
4. then upload the code.

Can transistor be used as relay?

A transistor is an electronic device that can work as a switch. It allows control of a large current by a smaller current as does a relay. Unlike a relay, however, a transistor is not mechanical, and can operate much faster than a relay. All transistors have some similar properties though.

What is the output of 5V relay?

This 5V relay module supports 10A maximum output current and maximum contact voltage of 250V AC and 30V DC. If you are using a high AC voltage and high current load with this module, you should use thick main cables.

How do you make a 12V relay module?

DIY Relay Module Making

1. Step 1: 12V Relay. Buying Link.
2. Step 2: PCB Board. I have used Dot PCB Board.
3. Step 3: Any PNP Transistor. Use any PNP Transistor Which Can Handle 20mA At least.
4. Step 4: PC817 Opto-Coupler.
5. Step 5: Resistor.
6. Step 6: PCB Mount Screw Terminal Block.
7. Step 7: Push Switch.
8. Step 8: Indicator LED.

How to use a transistor BC547 as a switch?

Useful Steps 1 Place Transistor on a breadboard 2 Connect Emitter to the ground of the battery 3 Add LED & 330 Ohm Resistor to Collector of BC547 4 Connect 1k Resistor and Switch to Base of transistor 5 Power up the circuit with 9V Battery More

What can you do with a 5V relay?

To show you how to wire the relay, let’s build a temperature controlled relay circuit that will turn off a light bulb when the temperature of a thermistor reaches 150°F. Thermistors are really useful with 5V relays. You can use them to turn off a large motor if gets too hot or turn on a heater if the temperature gets too cold.

Do you need a diode across the relay coil?

You need a diode across the relay coil to handle back EMF or you may destroy the transistor. Ignore the LED in this picture Here is the circuit, but the values should be calculated to adapte your circuit. Not the answer you’re looking for?

How does the SRD 05vdc-sl-C relay work?

The SRD-05VDC-SL-C relay has three high voltage terminals (NC, C, and NO) which connect to the device you want to control. The other side has three low voltage pins (Ground, Vcc, and Signal) which connect to the Arduino. Signal: Carries the trigger signal from the Arduino that activates the relay