On Jul 10, 1:26*pm, "N_Cook" wrote:
Seemed a neat idea but ...
There is space inside this 1950s dashboard radio for one of those keyfob/
matchbox size FM radios, this one based on a TDA7088T. The original AM radio
works fine, well minimal hash from the buzzer mechanism of the vibrator 12V
to HV supply and the FM works fine with a proper linear mains derived HV
unit and the 12V to 3V ps. But try the FM off the original HV supply and the
hash from the buzzer mechanism makes it unlistenable to. Whatever I try in
the way of screening/ wire routing makes little difference. Any ideas before
rejecting the project?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list onhttp://home.graffiti.net/diverse:graffiti.net/

Most mp3 players derive their radio reception from the headphones.
Isolate and bring out that wireto an external aerial and you will be
good for the strong FM stations. Next, get some filtering caps and put
them across the B+ and grounds of your player. Your audio output
ground will need to be shielded properly. Can you make a Faraday box
inside that radio?

Adam Kb2jpd