Electronics > Beginners
How would you replicate this PSU
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JS:

--- Quote from: rthorntn on June 05, 2018, 08:28:34 am ---Hi,

Would really appreciate some advice.

I have a failed Phihong PSM-5341, basically I want to build a modern replacement.

https://www.exxoshost.co.uk/atari/last/psu/PSM_5341_MegaSTE-TT030_PSU.pdf

+5V - 7.0A
+12 - 2.0A
-5V - 0.4A
-12V - 0.3A

Just spitballing... I could take say a standard AC/DC fixed voltage PSU, I would only need around 3A at 24V and convert it down, or maybe get two 30W dual output (5v/12v) to get the negative voltages?

People are replacing them with power brick + Pico-PSU + a little -5V converter thing from a guy in the UK called Ian, there has to be a nicer way.

http://www.ianstedman.co.uk/Amiga/designs/Amiga_ATX_Adaptor/amiga_atx_adaptor.html

The only thing interesting on this PSU is it has a "power good" signal, I guess that would have to be replicated.

Thanks for looking.

Cheers
Richard

--- End quote ---

What kind of solution are you trying to get with this? beter, more efficent and reliable? cheaper? easy to get up and running?
What about getting a PC PSU, many options out there, from brand new to some AT you can find in the dumpster, that would cover your need without much effort I guess.

JS

wraper:

--- Quote from: james_s on June 05, 2018, 06:06:23 pm ---Would an off the shelf micro ATX PSU fit?

--- End quote ---
Only if some really old (relatively low efficiency) crap. Modern ATX PSUs don't have -5V.
james_s:
Hmm good point. Well there are certainly plenty of power supplies out there with +/- 5V and 12V, and if you have one that has -12V it's easy enough to get -5V.

I would still just repair the original if possible though.
CJay:

--- Quote from: james_s on June 05, 2018, 08:34:58 pm ---Hmm good point. Well there are certainly plenty of power supplies out there with +/- 5V and 12V, and if you have one that has -12V it's easy enough to get -5V.

I would still just repair the original if possible though.

--- End quote ---

Absolutely, repair the original if possible, they're ridiculously simple supplies
stj:
an arcade psu could do it, they are 5v 12A, 12v 2-3A, -5v 1a
the -5 is usually from a 7905 regulator fed with -12 or -15v

but just fix the original - it's not worth bitching about efficiency over something only running a few A
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