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Linear regulators require at least 2-3 volts higher input than output voltage to work properly, and they need a heat sink. Most circuits the use them also have a capacitor from the input pin to ground pin, and another capacitor from the output pin to ground. I can't remember how to calculate the...

It isn't a 100% efficient conversion from input power to RF power out, plus there are things like meter backlights, the speaker, etc. I seem to remember a typical CB drawing a couple amps when transmitting. I haven't messed with one for years though. Your best bet is to measure the actual...

The CB will draw a lot more current than a LM7812 can handle. At 28.8v input voltage, a LM7812 could only handle a max of 700mA before the 12 watts of maximum power dissipation would be exceeded. You'll have to use one of the DC-DC 24v to 12v buck converters people on here have been talking...

This is certainly the best all around option in my opinion. Small/intermittent loads are fine to be "center tapped" without any additional considerations, but larger and more continuous loads would need an equalizer or converter. A large/robust enough DC-DC buck converter would be expensive, and...

I think it is a little bit presumptuous to say a few amps of imbalance on lead acid batteries in series will "kill"them. I was just saying that it seems like people have been using the low blower motor setting on their five ton trucks for years without causing premature battery failures. Seems...

FYI, this is what they do on the M939 series 5-ton trucks to get low speed for the heater blower. They run the blower on 24v for high speed, and 12v via a wire connected between the batteries for low speed. At just a few amps, it must not be as bad as we would intuitively think.