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Q: electronic plans (schematics) and kits ( No Answer,   3 Comments )
Subject: electronic plans (schematics) and kits
Category: Science > Instruments and Methods
Asked by: ninap20-ga
List Price: $10.00
Posted: 10 Aug 2005 09:24 PDT
Expires: 09 Sep 2005 09:24 PDT
Question ID: 554015
Looking for electronic plans (schematics) and kits for "mains powered
surveillance transmitters" - devices like the ones at for example, but NOT BUILT (!!)
The supplier must sale overseas.
There is no answer at this time.

Subject: Re: electronic plans (schematics) and kits
From: boyo62-ga on 10 Aug 2005 12:54 PDT
You might try this outfit in the UK:-
Subject: Re: electronic plans (schematics) and kits
From: ninap20-ga on 10 Aug 2005 21:34 PDT
Thanx a lot boyo62-ga for your answer.
I've tried to find before at this particular site and at many others
the "MAINS powered transmitter" without success. The transmitter (as
far as I know is a very simple one, but HAS to work directly from
220V, transformerless, as seen from the example I've sent...
No success finding till now :(
Thank you again,
Subject: Re: electronic plans (schematics) and kits
From: manifromch-ga on 24 Aug 2005 13:42 PDT
Don't give up...
We have used an adapted version of an application on microchips
web-site ""
to suite our customers needs. To run such a circuit off 230V You would
have to use an R and C in series and a bridge rectifier in series to
that to get lower voltage and then regulate that down using a straight
forward LM78L05 or so. That would work like a charm and You could
still program the PIC to suite Your needs...    ;-)

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