I have here a light detector. As far as I can remember it came from the
It is in a small plastic enclosure, roughly 2 inches by an inch and a
half and about an inch high. It has a sliding cover on the top which
reveals a push button.
Light enters from a tiny hole in one of the sides of the device.
I would like to get hold of some more of these, but like so many other
things, it looks like the RNIB don't have them any more.
Does anybody have any idea of where else they might be available?
There's about a quid's worth of electronic components in it, including
either a 555 timer chip or a 741, a couple of resistors and a
light-dependent resistor. But no doubt it costs an arm and a leg.
Michael A. Ray
Witley, Surrey, South-east UK
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