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Schematics Depot >> IR/Ultrasonic >> 555 Timer 40khz Oscillator

555 timer 40khz IR:
555 timer 40khz IR Oscillator

U1555 Timer IC
R147 ohm resistor
R2470 ohm resistor
R35k variable resistor
C10.0047uf ceramic capacitor
LED1,LED2Infrared LED's

This circuit oscillates two infrared LED's at 40 khz. To make sure it is transmitting IR light, you can get a little tool from radio shack for about $5. It is a small sheet of plastic about 1" by 3" with a special strip of material, that when exposed to IR light glows (it's actually kinda cool..) A way to check for 40khz IR light is to build a circuit that lights an led when 40khz light is detected. You can get the schematic by clicking here.

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