Infa-Red Remote Control

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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

This is the schematic of the IR Transmitter

Schematic For Receiver

This is the schematic for the IR Receiver

Parts

Part	Total Qty.	Description	Substitutions
R1	1	22K 1/4W Resistor
R2	1	1 Meg 1/4W Resistor
R3	1	1K 1/4W Resistor
R4, R5	2	100K 1/4W Resistor
R6	1	50K Pot
C1, C2	2	0.01uF 16V Ceramic Disk Capacitor
C3	1	100pF 16V Ceramic Disk Capacitor
C4	1	0.047uF 16V Ceramic Disk Capacitor
C5	1	0.1uF 16V Ceramic Disk Capacitor
C6	1	3.3uF 16V Electrolytic Capacitor
C7	1	1.5uF 16V Electrolytic Capacitor
Q1	1	2N2222 NPN Silicon Transistor	2N3904
Q2	1	2N2907 PNP Silicon Transistor
Q3	1	NPN Phototransistor
D1	1	1N914 Silicon Diode
IC1	1	LM308 Op Amp IC
IC2	1	LM567 Tone Decoder
LED1	1	Infa-Red LED
RELAY	1	6 Volt Relay
S1	1	SPST Push Button Switch
B1	1	3 Volt Battery	Two 1.5V batteries in series
MISC	1	Board, Sockets For ICs, Knob For R6, Battery Holder
RELAY	1	6 Volt Relay

Notes

To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6 until you hear the relay click.

You can increase range by using a high output LED for LED1.

Bright light will stop the receiver from responding to the transmitter.

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

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fatha Infa-Red Remote Control Monday, July 12, 2010 8:02:22 AM

what kind of NPN PHOTOTRANSISTOR IS USED HERE? is there any substitution of LM308?

Lee, Manchester, England Infa-Red Remote Control Sunday, April 18, 2010 6:03:04 PM

I set up the circuit for a small project and it worked very well. In order to function correctly, the reveiver needs to calibrated so as the Centre Frequency of the Tone Decoder, matches the frequency of the output of Pin 6 of the Op Amp. this is acheived by adjusting the Potentiometer to the required resistance (2.275K according to my calculations). if its difficult to set the Potentiomter exactly use a decade counter instead. The Frequencies have to be matched because the Tone Decoder purposefully has the characteristic of a high rejection ratio of intruder IR signals, ie TV Remotes. Also it is advisable to choose an IR Emitting Diode and Phototransistor that are strongly compatible with each other to acheive the best response time. The de-coupling electrolytic capacitors external to the Tone Decoder do not have to be the exact values stated, but as close as possible. Enjoy!

saad Infa-Red Remote Control Wednesday, April 14, 2010 9:17:42 AM

at what frequency does the LED of transmitter circuit emit infrared rays ? can any one help please !!!!

RAVINDER PAL SINGH Infa-Red Remote Control Sunday, April 04, 2010 2:10:12 AM

what kind of NPN PHOTOTRANSISTOR IS USED HERE? what the type (number)of Infa-Red LED ? plz tell

anonymous Infa-Red Remote Control Friday, March 05, 2010 8:42:51 AM

This is great.

sumit Infa-Red Remote Control Saturday, December 05, 2009 8:41:59 AM

what kind of NPN PHOTOTRANSISTOR IS USED HERE? is there any substitution of LM308?

cynic Infa-Red Remote Control Tuesday, October 06, 2009 11:49:37 AM

to mercurt: please, I want your help about what resistor you substitute the 1megOhm? im also constructing this circuit as our project in data communication...please help me, thanks a lot in advance...

william Infa-Red Remote Control Sunday, October 04, 2009 10:24:45 PM

Is there a way to get more than one channel?

majid thakur Infa-Red Remote Control for chanel latced bottan infa-red remote control Tuesday, September 29, 2009 2:46:32 PM

Could someone please help me? I am a beginner at this kind of stuff and i want to make 4 Chanel infrared remote control, depending on the components. Each device output can be configured to be momentary (turned on while you press the button) or latched. Latched outputs can be toggled on/off by one button per channel, or turned on and off by two buttons per channel. i have one 4 x 8 Chanel schematic for infa-red remote control but that its never responded. You can see that web site (Peter’s electronic projects) DIY remote control based on PIC help me with schematic related part.

Bipin kumar infrared remote control Friday, September 18, 2009 1:10:32 AM

1.whether any programming is required for infrared remote control? 2.Hoe power is supplied to infrared controller? 3.How logic circuit is made? I will heartly obliged if u wl sent me the answers as quickly as possible. Thanks

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fatha	Infa-Red Remote Control	Monday, July 12, 2010 8:02:22 AM
what kind of NPN PHOTOTRANSISTOR IS USED HERE? is there any substitution of LM308?
Lee, Manchester, England	Infa-Red Remote Control	Sunday, April 18, 2010 6:03:04 PM
I set up the circuit for a small project and it worked very well. In order to function correctly, the reveiver needs to calibrated so as the Centre Frequency of the Tone Decoder, matches the frequency of the output of Pin 6 of the Op Amp. this is acheived by adjusting the Potentiometer to the required resistance (2.275K according to my calculations). if its difficult to set the Potentiomter exactly use a decade counter instead. The Frequencies have to be matched because the Tone Decoder purposefully has the characteristic of a high rejection ratio of intruder IR signals, ie TV Remotes. Also it is advisable to choose an IR Emitting Diode and Phototransistor that are strongly compatible with each other to acheive the best response time. The de-coupling electrolytic capacitors external to the Tone Decoder do not have to be the exact values stated, but as close as possible. Enjoy!
saad	Infa-Red Remote Control	Wednesday, April 14, 2010 9:17:42 AM
at what frequency does the LED of transmitter circuit emit infrared rays ? can any one help please !!!!
RAVINDER PAL SINGH	Infa-Red Remote Control	Sunday, April 04, 2010 2:10:12 AM
what kind of NPN PHOTOTRANSISTOR IS USED HERE? what the type (number)of Infa-Red LED ? plz tell
anonymous	Infa-Red Remote Control	Friday, March 05, 2010 8:42:51 AM
This is great.
sumit	Infa-Red Remote Control	Saturday, December 05, 2009 8:41:59 AM
what kind of NPN PHOTOTRANSISTOR IS USED HERE? is there any substitution of LM308?
cynic	Infa-Red Remote Control	Tuesday, October 06, 2009 11:49:37 AM
to mercurt: please, I want your help about what resistor you substitute the 1megOhm? im also constructing this circuit as our project in data communication...please help me, thanks a lot in advance...
william	Infa-Red Remote Control	Sunday, October 04, 2009 10:24:45 PM
Is there a way to get more than one channel?
majid thakur	Infa-Red Remote Control for chanel latced bottan infa-red remote control	Tuesday, September 29, 2009 2:46:32 PM
Could someone please help me? I am a beginner at this kind of stuff and i want to make 4 Chanel infrared remote control, depending on the components. Each device output can be configured to be momentary (turned on while you press the button) or latched. Latched outputs can be toggled on/off by one button per channel, or turned on and off by two buttons per channel. i have one 4 x 8 Chanel schematic for infa-red remote control but that its never responded. You can see that web site (Peter’s electronic projects) DIY remote control based on PIC help me with schematic related part.
Bipin kumar	infrared remote control	Friday, September 18, 2009 1:10:32 AM
1.whether any programming is required for infrared remote control? 2.Hoe power is supplied to infrared controller? 3.How logic circuit is made? I will heartly obliged if u wl sent me the answers as quickly as possible. Thanks