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Circuit Notebook

Interesting circuit ideas which we have checked but not built and tested. Contributions from readers are welcome and will be paid for at standard rates.

Beam-break detector
for camera shutter or
flash control

Click for larger image

This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue. In order to make it relatively insensitive to ambient light, it uses a standard IR
receiver IC such as the Jaycar ZD-1942. This has a high output (+5V) as long as a modulated beam is detected.

The IR detector (IC3) controls an LM­7555 CMOS timer (IC2) which operates in mono­stable mode. When the beam is broken, IC2 is triggered and its pin 3 output goes high for about half a second. This extinguishes LED1 and turns on transistor Q1 to drive a 5V low-power relay.

The circuit is powered from six AA cells and a 78L05 5V regulator (necessary for the receiver IC).

The IR transmitter is also built around an LM7555 (IC1), this time operating in astable mode at low duty
cycle. Its frequency is set to 38kHz with trimpot VR1. The IR diode was salvaged from a defunct remote control but these are readily available new. The transmitter is powered by four AA cells.

The system has a range of several metres and while it is insensitive to the transmitter alignment, the detection window can be narrowed by placing the detector near to the object to be detected and/or using some form of baffle to restrict the window.

Graham Jackman,
Oakleigh East, Vic. ($40)

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