annoying whiney switchy power supply replacement - Page 1
Forum section: electronics / general

author: pepelevamp
author_rank: Regular Contributor
timestamp: July 18, 2019, 12:13:35 pm
content: Hiya guys.I just got myself a brand spanking new battery tester/charger unit from our friends at aliexpress.Comes with a 2amp 12v wall wart.Problem is its driving me up the wall. I have hyperaccusis (its a real thing) where sounds hurt & annoy me, and all i can hear is a robot mouse being tortured inside this black box.Questions is - do you get linear power supplies that can push 2 amps at 12v? I've never searched for wall wart ac/dc adapters before. I have no idea what the name brands are or what not.I'm cool with dc/dc converters that switch way up in the mhz range - cant hear that. But I know nothing about ac/dc converters. Anyone got any suggestions?Center-positive so thats something i suppose.EEEEEEeeeeeeeeeeeeeeeeeeeeeeeeee!!!

author: coppercone2
author_rank: Super Contributor
timestamp: July 18, 2019, 12:21:46 pm
content: if you don't mind the daisy chain, you can connect a random voltage linear supply wall wart to a DC DC converter inside a little containeri.e. 120vac - 48vdc 1A - 5vdc 2a would give you all the margin you want

author: pepelevamp
author_rank: Regular Contributor
timestamp: July 19, 2019, 04:33:00 am
content: oh yeah! now you're playing with power.i have a few higher voltage psus that ive flogged from different things over the years. they don't push out as much current though.got me thinking about a regulator also, but heat.i know its generally true for dc/dc buck converters but am i right in saying that if i need say to output a smaller voltage yet more current with the regulator, the higher voltage will make up for the weaker current supplying this whole thing?

author: Dundarave
author_rank: Regular Contributor
timestamp: July 19, 2019, 04:58:02 am
content: I just googled "12v 2 amp linear power supply" and got plenty of hits: Jameco, Newark, Ebay, etc.I don't think you'll have too much of a problem finding a decent one from one of the established companies. It might be a bit more bulky than the switcher you've got, but not overly so at that power output.: I take that back... following up on the hits I realize that 12V @ 2A linear is not as common as I thought. But Mouser seems to have a couple that might work: "Triad Magnetics 120 VAC 24 W 12 V Wall Mount AC Adapters".

author: pepelevamp
author_rank: Regular Contributor
timestamp: July 19, 2019, 08:43:04 pm
content: hey thanks man i appreciate it. you've got me onto some name brands & a bit of confidence here & there. I'll take it from here.Thanks man

author: edavid
author_rank: Super Contributor
timestamp: July 19, 2019, 09:34:17 pm
content: Just get a better quality switching wall wart. The kind that come with e.g. Seagate or WD external disk drives, or Netgear routers, are all completely silent.The brand that WD usually uses is Asian Power Devices (APD).

author: pepelevamp
author_rank: Regular Contributor
timestamp: July 23, 2019, 10:51:45 am
content: hey cool thanks. thats really helpful.asian power devices almost sounds like a joke.you know this charger / tester thing has USB which is powered from the batteries you put in. has a wee boost in there - and its noisy as hell tooheh.thanks dudes this has been real helpful