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PSU - identify the 34p one
Bit of a scam this as I'm not including the price of the supply before it but one of these three screen dumps is from a variable DC-DC 3A adapter that I purchased ten for less than £4
The other two are the stock 1500mah/5V switcher and a Linear PSU that cost me £80
The supply feeding the DC-DC is a 12V/1A BTW, linear type but nothing special.
When I see PSU noise it is normally down that end and the full spectrum didn't show much more. Yes I know that I live in a noisy place and sorry if the screen looks dark I use F-Lux and was trying to get this tested while my neighbour was out (very rare).
The other two are the stock 1500mah/5V switcher and a Linear PSU that cost me £80
The supply feeding the DC-DC is a 12V/1A BTW, linear type but nothing special.
When I see PSU noise it is normally down that end and the full spectrum didn't show much more. Yes I know that I live in a noisy place and sorry if the screen looks dark I use F-Lux and was trying to get this tested while my neighbour was out (very rare).
Comments
is this linear or switched ?
I checked if these DC-DC where still about the same price (Banggood not Ebay, Ebay are expensive now) and they are a bit more expensive, if someone has £10 they could afford 20 (£9.87 - mp1584en x20), sorry to mislead anyone by 15%!
Also they may need a cap on the output or some other work as my Kwi did the "start but no network" thing which can happen if the voltage dips during boot.
this mainly has to do with the build quality of the smps being used.
the smps I'm using is charger/DC supply for a 90's Sony camcorder I modified.
I hadn't tried these tiny PCB's simply as I had assumed the noise would be too intrusive but a comment on here prompted me to look. Linear supplies are getting harder to find more so considering switchers are often listed a "linear" now. In fact I'm getting annoyed with the amount of fake carp on Ebay, can't trust many listings now around power supplies, I still look for older stuff with full traceable approvals.
Clint
KA7OEI