Re: [PSUBS-MAILIST] variable speed switch.

[Ray Keefer <psubs2001@yahoo.com>]

Hi Bill,

A car's radio potentialometer is a variable resistor.
Changing resistance in the circuit changes the amount
of current or voltage that is passed onto to later
stages in the circuit. Thus varying the volume. No
fancy dc to ac to dc conversion.

Regards,
Ray

--- Akins <lakins1@tampabay.rr.com> wrote:

> A thought just occured to me. Wasn't it you Ian who
> told me this evening that dc voltage uses pulse wave
> modulation to enable a variance in the speed switch?
> If that is true then how does a 12 volt dc car
> radio's volume control potentiomenter work? Does it
> somehow convert the dc to ac for it's volume pot to
> work and then
> convert it back to dc again? From what you told me
> earlier about the pwm it is making me wonder now if
> my idea to find a 24 volt dc potentiometer would
> even work.
> Does a dc 24 volt potentiometer even exist or am I
> missing something? A little help?
> Bill Akins.


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