There is a standard used in instrumentation stuff....sort of autovolt on DC. Those devices work on anything from 10 to 30 volts, so it covers at least 12.0, 13.8, 24 and 28 volts.
Those devices are NOT inexpensive, and maybe a manufacturer would think a lot to add some regulator inside the two penny box he markets to allow using it with external power instead of one or two AA cells. I believe it is not a solution for everything, but some low consumption and not inexpensive piece of equipment could benefit from such "standard bus". Say, some receivers, low output power radios, etc. Jose, CO2JA ----- kd4e wrote: > I have an 'oft postponed low voltage bench supply project. > > I'd start with a 24VDC deep-cycle battery, float charged from > auto-controlled solar, pedal-power, and AC sources. > > The front panel would be a series of PowerPole connectors and each > connector would be matched to a switch that steps down from 24VDC to > the common voltages. > > One unresoloved detail was to use resistors, diodes, regulators, etc. > Minimal loss and minimal RFI are design imperatives. > > Also, unresolved are the maximum total and individual current > capacities. > > Possible voltages are 3. 4.5, 5, 6.3, 7.2, 8.4, 9, 12, 14.5, 16, 19, > 22, 24, etc. > > WDYT? > > -- > > Thanks! & 73, doc, KD4E > > > Is there a reason we can't sart some sort of campaign to eliminate > > "wall warts". I have 8 of these things laying on my desk each > > producing a different voltage for a divice that could easily > > operate at 12 volts with the addition of a tiny internal circuit > > costing a few cents at most, and probably less than the hated > > wart.there is a useless and tangle of wires. since I already have a > > big 12volt supply and distribuiton panel. it'd be nice to eliminate > > this dangerous clutter. how does one approach some international > > standards organization to cure the plague of wall warts? 73 Harv, > > N9AI/AI9NL
