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Infa-Red Remote Control Author

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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.

Schematic For Transmitter

Schematic For Receiver

Parts Total Qty.

Part R1 R2 R3

1 1 1

Description 22K 1/4W Resistor 1 Meg 1/4W Resistor 1K 1/4W Resistor

Substitutions

R4, R5 R6 C1, C2 C3 C4 C5 C6 C7 Q1 Q2 Q3 D1 IC1 IC2 LED1 RELAY S1

2 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1

100K 1/4W Resistor 50K Pot 0.01uF 16V Ceramic Disk Capacitor 100pF 16V Ceramic Disk Capacitor 0.047uF 16V Ceramic Disk Capacitor 0.1uF 16V Ceramic Disk Capacitor 3.3uF 16V Electrolytic Capacitor 1.5uF 16V Electrolytic Capacitor 2N2222 NPN Silicon Transistor 2N2907 PNP Silicon Transistor NPN Phototransistor 1N914 Silicon Diode LM308 Op Amp IC LM567 Tone Decoder Infa-Red LED 6 Volt Relay SPST Push Button Switch

2N3904

B1

1

3 Volt Battery

Two 1.5V batteries in series

MISC

1

RELAY 1

Board, Sockets For ICs, Knob For R6, Battery Holder 6 Volt Relay

Notes 1. To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6 until you hear the relay click. 2. You can increase range by using a high output LED for LED1. 3. Bright light will stop the receiver from responding to the transmitter. 4. There is an error in the schematic. There shuold be a 1 megaohm resistor between pin 3 of IC1 and ground. This provides a 0 volt reference to bias the IC.

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Comments Mercurt Infa-Red Remote Control Wednesday, July 15, 2009 12:58:39 AM Thanks for the great circuit. It worked after I did some tuning of my own.. First the 1 megaohm didnt work for me so I had to find a suitable resistor that worked. Also a precise resistance is required from the resistance pot to make it work.. But overall it worked great.. Thanks again.. Keep it up..

RR S Infa-Red Remote Control Thursday, May 21, 2009 9:27:07 PM I just went to the store ans asked for any phototransistor...The guy said I was crazy because he doesnt know what to sell me from the milluion parts he has. He asked for a part number...can someone give me the pert number they used or tried. The guy wouldnt even sell me a random one...I asked him but he refused. Please someone help me out. anonymous Infa-Red Remote Control Thursday, May 07, 2009 10:04:24 PM Could someone please help me. I am a beginner at this kind of stuff and I just want to make a one button simple IR remote. I have an IR receiver module. Is this an IR triggered switch in itself? vijay Infa-Red Remote Control Thursday, February 05, 2009 2:45:30 AM Its very nice. Dhanasekar P Infa-Red Remote Control Sunday, February 01, 2009 9:15:43 PM Hi I`ve a gradually voltage increased LED on the transmission side. For this i need a IR / RF transmitter and receiver circuit ankit patel Infa-Red Remote Control Wednesday, January 28, 2009 3:46:28 AM i want to set frequency 0f more than 50 what i have to do? KFH Infa-Red Remote Control Saturday, January 24, 2009 3:40:56 PM I'm in my way to finish the connection of the circuit but i'm asking how can i let the NPN phototransistor receive the sign from the infra-red with longer distance pls help me in this thank you... dear sparchead Infa-Red Remote Control Wednesday, January 14, 2009 12:11:54 PM not working for me.. I used NTE3122 phototransistor.. 1 megaohm resistor between pin 3 of IC1 and ground.. tried with and without R6.. all the parts I used are the same as in the list except 2N2222, unfortunately I can't find them here in montreal so I tried PN2222 and 2N3904.. I don't know if the problem is from the transmitter or receiver.. but when I touch the phototransistor pins with a jumper, as soon as I release this jumper, the relay receive a pulse and it activate for a short time, but doesn't stay on.. I also tried many different IR leds on the transmitter.. Nitin Circuit Diagram Saturday, December 06, 2008 3:37:03 AM I have a car which moves forward and back word dirction. But now problem is that it could go backworkd direction the technical details of car as Circuit No JM67 using transistor No. S8050 S8550. can help me regarding circuit diagram of the same, please. Tim Mottram Infa-Red Remote Control Friday, December 05, 2008 7:12:25 PM Hi im trying to build a simple IR remote which sends a short pulse to a receiver, which in turn will send a signal to turn a motor. At the moment i have a debounced switch sending a signal to an IRED. I was then thinking to use a phototransistor (incorprated in a common emitter amplifier) to drive a motor. The circuit here look really good but is more complicated that i invisaged it would be. Can you tell me if there is some thing im missing? Thanks, kind regards. Tim The last 10 comments are currently shown. Show All Comments. If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.

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