SPDT 12V 10AMP 5 PIN RELAY IN PAKISTAN
- Model :JQC-3F(T73)
- COIL VOLTAGE =12V
- CURRENT CAPACITY =10AMP
- COIL CURRENT 30mA
A relay is an anelectrically operated switch. Current flowing through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts. The coil current can be on or off so relays have two switch positions and they aredouble throw(changeover) switches.
The relays switch connections are usually labeled
A relay shown in the picture is an electromagnetic or mechanical relay.
Fig. Relay and its symbol
There are 5 Pins in a relay. Two pins A and B are two ends of a coil that are kept inside the relay. The coil is wound on a small rod that gets magnetized whenever current passes through it.
Here is an example,
First of all try the following circuit.
This is a dark sensor circuit.
Fig. Dark sensor using two transistors
Components for this experiment are available at buildcircuit.net.
Output of this circuit: When you block light falling on LDR, the circuit switches on the LED- D1.
Now, replace LED-D1 and R2- 330R with a relay and diode.
Reconfigure the circuit as shown in the figure below:
Note: In R3, you can keep any resistor from 330R to 4.7K, this resistor is for sensitivity of the dark sensor.
The following circuit also works as a dark sensor. When you block light falling on LDR, the relay gets activated and Pole of relay gets connected to
Fig. Dark sensor using two transistorsand a relay.
Light sensor using relay and transistors
In this case, the configuration of relay has been changed. Here,
Fig. Light sensor using two transistors and a relay.