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Infrared burglar alarm circuit Fig. 1: Infrared Burglar Alarm: Transmitter circuit. The transmitter section is built around IC 555 (IC1), which is wired as an astable multivibrator and produces about ...
Working of the circuit is simple. Initially, when no IR beam is falling on sensor TSOP1738, the relay remains de-energised and the toy car doesn’t move. When switch S1 is pressed, the IR beam falls on ...
Whenever someone moves through this beam, IR rays stops falling on photodiode and Buzzer start beeping. Buzzer automatically stops after some time, as buzzer is connected to 555 timer in monostable ...
This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue (Silicon Chip). In order to make it relatively insensitive to ambient light, it uses a ...
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