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055
Simple Remote Control Tester
F. Jensen
+9V
Nearly always when a remote control doesn’t work, the
underlying problem is elementary: the unit does not emit
light. The cause may be dry solder joints, defective LEDs
etc., but also a flat battery (perhaps due to stuck key).
The human eye is unable to perceive infra-red light. By
contrast, an ordinary photo transistor like the BP103 has no
problems working in the infrared spectrum, so in the cir-
cuit here it simply biases the BC558 which, in turn, makes
LED D1 flash in sympathy with the telegram from the
remote control. The preset in the circuit determines the
sensitivity.
P1
T1
100k
R1
10k
R2
BC558
R2
T2
T3
D
1
BC558
BP103
(014073-1)
014073 - 11
7-8/2001
Elektor Electronics
87
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