From: Fred Martin (mung@in-touch.net)
Date: Tue May 18 2004 - 06:56:03 PDT
El-cheapo man's converter to change 24 volts to 12...solder a string of
diodes in series...with the thought in mind that each diode reduces the
voltage by .6 (6/10) volt. (yep, it'll take a lot of 'em) Keep adding
them till you get the voltage output that you want. Someone else will
probably show how to use a zener diode to make a similar voltage reducer
as long as it isn't used for more than it is designed for...it will work
and is cheap to make. Fred
Ryan Gill wrote:
> At 1:05 PM -0400 5/17/04, Charles Kealey wrote:
>
>> Ryan,
>>
>> I don't know about 24 volt CB radios but you may want to check with a
>> marine
>> (boat not gun toter) supplier. Some of the older boats were operating
>> in, I
>> believe, the ranges of 24 and 32 volts. Some of the marine suppliers may
>> have radios set up this way.
>
>
> I called a couple of CB retailers and they say there aren't 24 volt cbs
> out there. I'll probably try connecting a CB radio to one of the
> batteries, but, I'll get a DC-DC unit. One company I've bought products
> for work makes a DC-DC (20-34 vdc to 12 vdc) converter that can also be
> configured to charge batteries. That might be the ideal thing. Add a 12
> volt battery into the truck somewhere for accessories and running them
> when the truck is off. The units are marine spec (not water proof, but
> resistant to corrosive salts, etc) and have vibration kits as options.
>
> http://www.newmarpower.com (DC-DC converters Neg Ground)
>
>>
>> The CB does work in the duece but you will also need a way to hear it. I
>> have a 24 volt to 12 volt power inverter in the cab and run the CB off of
>> that. I also put an amplified speaker in the cab which just hangs with
>> cable ties from the rear and uppermost top bow. That also makes it
>> easy to
>> remove when showing off the truck in its natural state. I was running
>> the
>> music radio, CB/amplified speaker and some other gadgets off of one
>> battery
>> but this proved to be a problem on long trips. The batteries that I have
>> are not the full size military ones and have a tendency to run down one
>> battery while charging the other. I know nothing about how electricity
>
>
> Well, when you pull enough amps from one of two sets of batteries in
> series, it puts the lower charged battery into a lesser state of charge.
> As I understand it, as a battery is charged it's internal resistance
> goes down putting less amperage into it to charge. But, when you have a
> lower charged battery in series with another, the battery that's been
> drawn down, pulls more current and as such causes the 'full' battery to
> be over charged, causing it to start to boil dry. I had a battery in the
> Ferret that was down over the other and caused this kind of problem. I
> bought some deep cycle marine batteries that had secondary posts to
> allow individual monitoring and charging of each battery if need be. So
> far I've not had any problems, but the leads are there to tap into and
> check.
>
> Remember, any gauges in the truck are showing the net voltage of the two
> batteries (four in some cases). If they're out of balance, that won't be
> apparent.
>
>
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