Simple IR transmitter circuit

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Simple IR transmitter circuit
Transmitter circuit information
This is an IR transmitting circuit which can be used in many projects (I designed this to try to make my
3D glasses wireless). This IR transmitter sends 40 kHz (frequency can be adjusted using R2) carrier
under computer control (computer can turn the IR transmission on and off). IR carriers at around 40
kHz carrier frequency are widely used in TV remote controlling and ICs for receiving these signals are
quite easily available.
The circuit can be controlled using any TTL or RS-232C level control signal which makes the interfacing
very simple. The circuit can be used for example for using computer to generate IR remote control
signals or experimental IR data transmission.
The circuit works so that when the input (LEFT/RIGHT CONTROL) pin is in logic high state (+4..15V)
the transmitter is on and when it is in logic low state (+1V..-15V) the transmitter is off.
Component list for IR transmitter
C1
C2
C3
D1,D2
D3
R1
R2
R3
U1
1 nF
10 nF
220 nF
1N4148
TIL31B (or other suitable IR LED)
1 kohm
22 kohm trimmer
120 ohm
NE555, LM555 or similar
IR receiver and sega glass interface circuit
I designed the circuit to make my Sega 3D glasses wireless, but system did not work as well as I
wanted it to work. I used the circuit below to receiving the IR signals and controlling the IR glasses.
Component list
Amount
2
2
1
1
1
1
1
3
1
1
Component
10 kohm resistor
22 kohm resistor
10 uF electrolytic capacitor
100 nF capacitor
10 nF capacitor
78L05 regulator (normal 7805 works also)
GP1U52X receiver module
1N4148 diode
2N2222 transistor (BC547 works also)
3.5 mm stereo jack
Modification ideas
The circuit can be also used for slow serial data transfer by connecting RS -232 data output to the
transmitter module left/right control pin and connect the output of GP1U52X receiver module to RS -232
data input through suitable RS-232 buffer circuit. Maximum data rates achievable are at around 1200 2400 bps speed.
GP1U52X is quite hard component to get outside USA (in USA Radio Shack sells it cat. No. 276 -0137).
European experiments can try to replace it with SFH 506 or SFH 507 from Siemens. According some
comments I have got none of the components I mentioned (GP1U52H, SFH506, SFH507) are no longer
available, so you might not be able to get those. I don't know what would be a good more modern
component replacement, because I have not tried other types than those myself.
Tomi Engdahl <[email protected]>
Last modified: May 28, 2002
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