Here’s a simple, low cost, and easy to construct infrared remote
control tester. The tester is built around an easily available infrared
receiver module (TSOP 1238).
Circuit Diagram:
IR Remote Control Tester Circuit Diagram
Normally,
data output pin 3 of the IR receiver module is at a high level (5
volts)and as such driver transistor T1 is in cut-off state. Whenever the
IR receiver module receives a valid (modulated) infrared signal, its
data output pin goes low in synchronism with the received infrared
bursts. As a result, transistor T1 conducts during negative pulse period
and the.LED blinks to indicate reception of signals from the remote
such as TV remote control. A miniature active buzzer is connected at the
collector of transistor T1 for audio indication.
The
5V DC for energizing the circuit is directly derived from the 230V AC
mains supply. Unlike the conventional resistive voltage divider, a
capacitive potential divider is used here, which does not radiate any
heat and makes the tester quite compact. Another advantage of this
tester is no false triggering due to the ambient light or electronic
ballast-operated tubelights. A suggested enclosure for the circuit is
shown in Fig. 2.
Author : T.K. Hareendran : Copyright :Electronics For You September 2002
IR Remote Control Tester Circuit Diagram
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