Topband: 5V 3A Wall Wart Recommendations?

[Bill Cromwell]

I just love these dim witted touch screens. Apparently I bumped the send icon before it's time. I was going to mention that I have had the pleasure of being in a QSO when the electric utility failed. My all-battery  station did not miss a beat:)

Of course, I do not charge the batteries that are in use. Conducted noise from the power lines ya know.

73,

Bill  KU8H

> On Feb 18, 2025, at 8:00 AM, Bill Cromwell <wrcromwell at gmail.com> wrote:
> 
> 
> Hi,
> 
> This must be the place for me to attach this thread. I started using batteries to power my receivers with vacuum tubes in them. OYYY! That eliminated conducted power line noise completely. It also eliminated annoying frequency changes when the furnace blower or AC kicked on or off.
> 
> More recently the computer hardware has been the sore spot. Once again, batteries to the rescue. I have a very quiet mini PC. Just lucky I suppose. It runs on 12 volts DC but so far I am using with an analog AC energized power supply. I also have a small HDMI monitor that I power from a 12 volt battery. The wall wart that came with it was horrendous! That thing now resides in the landfill. the batteries I use now at full charge when fully charged provide approximately 14 volts and quickly come down into the 13ish volt range. It is possible to find quiet power banks for the "5 Volt" bits but four NiCad cells in series give us 5ish volts and at full charge do not exceed the manufacturer's published specs for maximum power supply voltage. 
> 
>>> On Feb 18, 2025, at 4:44 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:
>>> 
>> On 2/17/2025 10:24 PM, Steve Harrison wrote:
>>> Only those that use a switcher for the regulator.
>> 
>> Exactly, which I assumed Joe and others were smart enough to pick up from my reference. :)  Thanks for filling that in.
>> 
>>> An oscilloscope is often a big
>>> help to find and suppress a noisy regulator chip.
>> 
>> As are battery-operated receivers.
>> 
>> 73, Jim K9YC
>> 
>> 
>> _________________
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