Wirefree Doorbell modification

["David Ward" <d.ward@xxxxxxxxxx>]

Wirefree Door Chime modification=20
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Argos  868/1548  Doorman 25m Wire Free Portable Door Chime Kit.  =A37.99
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and
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Argos 868/1366  Doorman 50m Wire Free Portable Door Chime Kit.  =A39.99 
(T=
he pictures are of this one)
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I bought the 50m version from Argos.  I bought a 25m version from Wickes
th=
at was identical inside apart from the length of aerial and no 3vReg was
fi=
tted on the PCB

There are some photos of the insides of the receiver and transmitter
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http://www.flickr.com/photos/30041065@N00/
<http://www.flickr.com/photos/30=
041065@N00/>=20
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The pictures are of the Receiver before modification and the transmitter
wi=
th internal modification.=20
I've moddified two now,  the first is to be used on a remote alarm system
a=
s a wirefree door sensor transmitter.
The receiver part is hidden away and connected to a PIC which controls a
ch=
eap solar Mobile phone for remote monitoring.
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The second transmitter has the one shot circuit outside of the case in a
tu=
be of heatshrink to allow me to position the reed switch more easily.
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Dave
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David F H Ward
Electronics Design Engineer
Surrey Satellite Technology Ltd.
Rayleigh House
Unit 1 & 2
Sevenoaks Enterprise Centre
Bat and Ball Road
Sevenoaks
Kent
TN14 5LJ
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Tel.    +44 (0) 1483 80 4719
E-mail:    D.Ward@xxxxxxx
Web:      http://www.sstl.co.uk/
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