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Guest
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I have acquired what appears to be a digital clock
with twin ultrasonic transducers facing towards the
front.
When I power it up, it is quiet, but as soon as I move
in front of it, it initiates a loud clicking noise, almost as though
by ticking like a clock it won't warn off intruders, but would
warn the owner that there had been an intrusion. There is
a plastic socket on the front with what appears to be a coupling
coil buit in; perhaps there was some form of electronic master
key to shut the thing off?
Any way, it has the identifying model no "BD100" on the front
and seems to have been manufatured by Fotherby Willis Electronics Ltd
of Leeds, UK, a division of Glynwed.
Any information on it would be gratefully received, failing which it'll
be several hours of tracing the circuit. |
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