红外线远程控制电路 Infa-Red Remote Cont
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.
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