The relay helps to connect any electrical devises to the circuit and you can control any electrical equipment not only a light.
You must need regulated power supply of 5 volt to do this circuit because TSOP require 5v. Its voltage should not exceed 5V.
- Similar Circuit: Clap switch Circuit
Circuit Diagram of Remote Control Light
- 230v to 6v step down transformer
- 7805 voltage regulator
- TSOP IR receiver
- IC 555
- IC 7474
- BC 187 Transistor
- Diode 1N4007x5
- Resistors (220KΩ, 100Ω)
- Relay (6V)
- Capacitor (1μF, 470μF)
Working of Remote Control Light Switch
- Power supply circuit is not shown here. 1st you build a Rectifier circuit for 6v DC and proceed.
- Maximum voltage of TSOP and 7474 is 5V hence we are using 7805 voltage regulator IC to get constant 5V DC.
- The output of TSOP is always 5V, and the output will be zero when IR rays strikes on it.
- 555 IC biased as a Monostable Multivibrator. Normally its output is 0V (ground potential), provided that voltage at the 2nd pin must be greater than 1/3Vcc.
- When the voltage at the 2nd pin goes below 1/3Vcc output switches to high (5V) for the time T=1.1RC after the time interval output returns to 0V again.
- The D-flip flop7474 is wired as Toggle mode, i.e. Q’ to D input. 555 used as clock generator to the flip flop.
- When it get a clock pulse Output goes to High and remain in that state until it get next pulse.
- On receiving next pulse output goes to low and remain in that state till the next pulse.
- This process will continue.
- Output of 7474 is fed to base terminal of BC 187 which is driver transistor, when it base voltage is high current will flow through the load
- Here relay is the load and it will energize only when the base voltage of BC 187 is high and connects the 230v AC supply to the Bulb or light.
- Diode Df is freewheeling diode used to dissipate the stored energy in the inductor load. It is essential for the smooth working of this circuit