Sunday, December 22, 2013

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Wiring Diagram for IR Remote Control Tester

small circuit is ideal for checking the basic operation of an infrared
remote control unit. The circuit is based on the brilliantly simple
idea of connecting a piezo buzzer directly to an IR receiver IC. This
method is almost as simple as connecting a photodiode directly to the
input of an oscilloscope, but has the advantage that no oscilloscope is
needed: the compact unit is always ready to use and much easier to
carry around than bulky test equipment.

IR Remote Control Tester circuit schematic

of the remote control is indicated by the buzzer making a chattering
noise. The circuit is very sensitive and has a range of several meters.
The TSOP1738 integrated IR receiver accepts, amplifies and demodulates
the IR signal from the remote control, producing an output with a
frequency of around 700 Hz. The piezo buzzer is connected to its output,
rendering the signal audible. All the other components are simply
concerned with producing a stable 5 V power supply from the 9V
PP3-(6F22) type battery.

Instead of the TSOP1738 similar devices
from other manufacturers can be used, and of course carrier frequencies
other than 38 kHz can be used. The circuit still works if there is a
mismatch between the nominal carrier frequencies of the transmitter and
receiver IC, but range is reduced. It is still, however, adequate for
determining whether a remote control is producing an IR signal or not.

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