紅外線遠(yuǎn)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

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.