Yep - had a Yaesu 727 handheld with that... the cigarette lighter adapter had a dual plug with a coaxial plug for operating the handheld and a 1/8" one for charging the battery. The charger was nothing but a fixed resistor (1/4w !!!) between the 12v input and the hot side of the battery. The cord dropped between the seats in teh truck one day and the tip of the 1/8" plug touched the steel seat slide. POOF! went the 1/4 watt resistor. I replaced it with a LM317 adjustable voltage regulator chip set to result in zero current when the battery was fully charged. And the current was limited to prevent overcurrent damage to the battery. Crude, but effective, and 100% junk box.
Mike At 01:07 PM 03/23/07, you wrote: >Gotta be better then using one of those 'mini' or 'micro' earphone plug >style connectors! >You know where the center pin shorts to the outer contact briefly while >your inserting/removing? >ZAP! >-- >Jim Barbour >WD8CHL > > > >Robin Midgett wrote: > > Personally I don't like the RCA connector for power use. Assuming the > > female is chassis mounted, as it has been on a number of pieces of > > equipment (DEMI transverters come to mind), that means there's a > > mating male connector with +12VDC on the exposed pin, just looking > > for something to short out with. Granted, it may see very few > > insertions/extractions, but when extracted it exposes a live pin. A > > pigtail on the equipment with a male connector could be used, making > > the power source available on a female inline connector. > > PowerPoles are a much better choice IMHO, and they can be chassis > > mounted with some insulating shoulder washers, like power transistors > > & banana connectors often are. > > > > > > At 11:43 AM 3/23/2007, you wrote: > >> How about using an RCA connector for power? I have a TX/RX Systems > >> preamp that has a male RCA plug threaded into the case to supply it > >> with 12 VDC. > >> > >> Chuck > >> WB2EDV > > > > > >Yahoo! Groups Links > > >
