[TowerTalk] zero RFI float charger for 12V battery

[jimlux]

On 7/25/20 12:17 PM, jimlux wrote:
> I'm putting some remote gear (tuner & relay boxes) at the antenna base 
> that runs off a standard 12V-7Ah battery (control is via WiFi) that runs 
> the microcontroller and energizes the relays, etc.  Average load is low, 
> peak load is high.
> 
> I've got a nice inexpensive powersonic wallwart fast/float charger, but 
> it's a switcher, and noisy.
> 
> I'm looking for a inexpensive, wall wart style charger that has *some* 
> regulation (AC line voltage will vary, temperature varies, etc.), and 
> I'm not looking to build something. I just want to plug it in and have 
> it work.
> 
> Has anyone run across such a thing? (countless items in catalogs, but 
> nothing talks about RFI.. maybe there's a key term to look for?)
> 

One problem seems to be that conventional linear regulators are too 
inefficient to be sold as consumer products.