A simple Remote control Tester
Here is a handy gadget for test- ing of infrared (IR) based re- mote control
transmitters used for TVs and VCRs etc. The IR signals from a remote control
transmitter are sensed by the IR sensor module in the tester and its output at
pin 2 goes low. This in turn switches on transistor T1 and causes LED1 to blink.
At the same time, the buzzer beeps at the same rate as the incoming signals from
the remote control transmitter. The pressing of different buttons on the remote
control will result in different pulse rates which would change the rate at
which the LED blinks or the buzzer beeps. When no signal is sensed by the sensor
module, output pin 2 of the sensor goes high and, as a result, transistor T1
switches off and hence LED1 and buzzer BZ1 go off. This circuit requires 5V
regulated power supply which can be obtained from 9V eliminator and connected to
the circuit through a jack. Capacitor C1 smoothes DC input while capacitor C2
suppresses any sudden spikes appearing in the input supply. Here, a plastic
moulded sensor has been used so that it can easily stick out from a cut in the
metal box in which it is housed. It requires less space. Proper grounding of the
metal case will ensure that the electromagnetic emissions which are produced by
tube-lights and electronic ballasts etc (which lie within the bandwidth of
receiver circuit) are effectively grounded and do not interfere with the
functioning of the circuit. The proposed layout of the box containing the
circuit is shown in the figure. The 9-volt DC supply from the eliminator can be
fed into the jack using a banana-type plug.
Tech. Editor’s note: In fact, the complete gadget can be assembled in the
eliminator’s housing itself and a cut can be made in its body for exposing the
IR module’s sensor part.
Title: A simple Remote control Tester
electronic circuit
Source: www.electronic-circuits-diagrams.com
Published on: 2005-02-09
Reads: 1201
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