红外线远程控制电路

红外线远程控制电路 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.