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InfraRed Emitter
I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no accidental activations.
Parts:
R1 ------------22K 1/4Watts
R2-------------1M 1/4Watts
C1_________0.01uF 16V Ceramic Disk Capacitor
Q1____________2N2222 NPN Silicon Transistor
Q2____________2N2907 PNP Silicon Transistor
LED1__________Infa-Red LED
B1_____________3 Volt Battery
S1_____________SPST Push Button Switch
