Mutchus

INFRARED (IR) FLASHER CIRCUIT is very much important for security or burglar systems. The Circuit is quite simple and easy to do for your projects. As we discussed in my previous posts IR SWITCHING CIRCUIT, Infrared rays are invisible to human eyes. We can only see it through a camera. Circuit diagram of Infrared flasher Circuit Specifications R1- 150K R2- 1.5K C- 0.01μF Ic 555 timer constitutes the heart of this circuit, it is wired as an ASTABLE MULTIVIBRATOR which will produce a Frequency determined by the RC(R1,R2,C) time constant of the circuit. You can use our 555 Frequency Calculator tool to find the output Frequency of this circuit. The output voltage from pin 3 will drive the IR Led to glow. You can use 2 led's in series to increase the brightness. This circuit can be used as a flasher for security cameras at night.

This circuit will allow you to turn on any piece of equipment that operates on 115 volts ac. The receiver circuit is based on the Radio Shack infrared receiver module (MOD), part number 276-137. It is also available from some of the other sources listed on my s page. The MOD accepts a 40khz IR signal that is modulated at 4 khz. Circuit Diagram When a signal is received the MOD will go low. The sensitivity of the MOD is set by different values for R1 and C1. The values for R1 may need to be as high as 10,000 ohms and for C1 40uf. This will prevent the unit from turning on under normal lighting conditions. You will need to experiment with the values that work best for you. The output of the 4013 chip a flip flop toggles on and off with the reception of a IR pulse. The output of the 4013 turns on the MOC optical coupler which in turn switches on the triac and supplies power to the AC load.