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Old 13 August 2019, 04:25   #1
aeberbach
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An Amiga 1200 *internal* power supply

I put a Mean Well RPT-60B where the floppy used to be in my A1200

The whole thing sits in a 3D-printed mount. The power cord and a switch sit at the back right of the machine where you can reach them. It's a tight fit, but after a lot of prototypes I got it to sit nicely with space around it.



A bit more writing and a couple more pictures at http://www.grayunicorn.com
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Old 13 August 2019, 20:12   #2
Marlon_
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Nice! i did something similar with a built-in PicoPSU. Out of curiosity, why did you use a Meanwell instead of a PicoPSU?
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Old 13 August 2019, 22:26   #3
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The PicoPSU is DC-DC, so you need an external converter (a good 12V supply). That means you still have a brick on the floor or a big plugpack at least? I just wanted to plug into the mains same as a Mac mini - single IEC C8 cord.
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Old 13 August 2019, 23:30   #4
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Quote:
Originally Posted by aeberbach View Post
The PicoPSU is DC-DC, so you need an external converter (a good 12V supply). That means you still have a brick on the floor or a big plugpack at least? I just wanted to plug into the mains same as a Mac mini - single IEC C8 cord.
Ah, I see.

I just have a tiny 12VDC adapter for my PicoPSU, way smaller than the original powerbrick anyway.

I personally don't want to mess with mains power (230VAC) as you'd need to be a proper licensed electrician to work with that in Sweden. Messing with something like that and it for some reason fails and causes a fire, it would invalidate my insurance, since I'm not a licensed electrician. :P
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Old 14 August 2019, 13:05   #5
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Nice, note that the Mean Wells are usually specified with a minimum load on the different rails for stable operation. The 5V shouldn't be a problem since almost everything in the amiga draws from the +5V but check the specs for 12V and -12V. You might wanna put a suitable power resistor on each of those lines (to GND) to at least have a "dummy" load above the threshold instead of zero amps.
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Old Yesterday, 16:06   #6
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That looks awesome! Will you provide the .stl files for the frame? I'd love to replace the huge brick sitting under the desk with something like a picoPSU, but this is even better given the fact that I have absolutely no use for the floppy drive.

Cheers.
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Old Today, 00:38   #7
aeberbach
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I will definitely share the model but need to revise one or two things. When you use something for a bit there are always a couple of little improvements to discover.
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