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Hi Ray.
I had read so many e mails last evening Ray, that I
forgot who told me about the pwm for dc.
I realize now it was you and not Ian who told me
about the pwm. Thanks.
Ray, do you know if 24 volt pots are made and even
exist? I know 12 volt does, or else
there wouldn't be any volume control pots on a car
radio, but I don't know if 24 volt pots exist.
If they do exist, since you said a dc pot acts as a
variable resistor, would that mean the dc pot
would wastefully eat up some of my battery current
by heating up a resistance coil or heat sink?
Or could I be lucky enough that the dc pot just
allows the current thru that I need, without wasting
any of it thru heat loss? If the 24 volt dc pots do
exist, and do not waste battery electricity by coil or heat
sink burnoff, then it sounds like all I would need
would be a 24 volt pot, a waterproof housing and the
port with O rings and attached stem that Chris told
me about. Does this sound correct to you Ray?
Bill Akins.
----- Original Message -----
Sent: Wednesday, February 08, 2006 12:17
PM
Subject: Re: [PSUBS-MAILIST] variable
speed switch.
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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