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035

Infrared Light Switch

B. Kainka

R1

R3

La1

Inexpensive receivers for standard infrared remote control

units for television sets and video recorders are available in

the form of integrated circuits. Normally, a computer or micro-

controller looks after decoding the light signals. However, this

circuit shows that there are alternatives. It reacts to an IR sig-

nal, or at least to a signal sent with a carrier frequency of 36

kHz (other types of ICs are available for other frequencies).

When such a signal is received, the infrared receiver IC dis-

charges the capacitor, causing the ﬁrst transistor to be cut off

100mA

BT1

T2

IC1

T1

BC548

4V5

D1

R2

27k

BC548

C1

220

µ

16V

024062 - 11

12/2002

Elektor Electronics

71

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SMALL CIRCUITS COLLECTION

and the second one to conduct. The lamp goes on and

remains on until the IR signal stops and the capacitor

recharges to the base–emitter voltage of the connected tran-

sistor via the 100-k Ω

SFH506

TSOP1836

SFH505A

PI C12043 S

IS1U60

TFMS5360

SFH5110

TSOP1736

NJL61H380

resistor.

(024062-1)

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