[Healeys] Re - Radio, changing from positive ground to negative ground?

[mike brooks]

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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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