紅外線遠程控制電路

紅外線遠程控制電路 Infa-Red Remote Control

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

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:
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.