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On Sun, 22 Oct 2017 at 10:25 pm, mike brooks<hypercubic at yahoo.co.uk>
wrote: All you need is a 12volt DC to 24 volt DC converter with at least
enough amps for the radio. MGAguru has a great article on this for which here
is a link
http://mgaguru.com/mgtech/electric/et207.htm
In brief, the negative earth radio will have its case bolted to the car
structure as normal. The case will be at +12volt. Providing +24 volts on the
live wire then provides a voltage difference of +12 volts between the live wire
and earth. So the radio gets its 12 volts in the correct sense, while the radio
doesn't need to be isolated from the car chassis.
There's a choice of converters on ebay.
The reason the old "converters" made noises is that they would have used an
oscillator to alternate the DC to AC before transforming and rectifying. Modern
devices are solid state and will be silent.
Rgds
Mike Brooks'56 BN2Scotland
?
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