hi my internal PSU has finally given up the ghost so will have to order a recap lit in the new year (i dont like ordering over Christmas as temporary postman prat tends to lose or damage stuff ) while waiting i came across some USB c power supplies and various ways to replace the standard PSU which look like fun builds
i want to keep my original PSU , well , original and have one i can use with modern parts to see how r=practical it would be for furture purchases that might need such a thing
what i am after is either
a 3D print of the base mount with the switch and socket outlet (i found a mega st version but the placement of those items is different and im not any good at modelling )
or
an actual base which of course im willing to negotiate on
any help would be great
STe PSU
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rubber_jonnie
- Site Admin

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Re: STe PSU
Don't forget, you will ultimately need both 5v and 12V to be fully functional. so you'll need to have a solution that does all of that.
So consumers of 12v are:
Personally if a recap doesn't do it, then I usually install a Meanwell RD-50A. They fit in place of the old PSU and have both 5v and 12v and more than enough amperage to meet the requirements of the machine.
Whilst I see a lot of USB C solutions out there you can't beat a Meanwell as a solid replacement.
So consumers of 12v are:
- Floppy drive, but only if the drive requires 12v. Not all drives do and Goteks only need 5v.
- The audio amp. Without it the sound output from the RCA jacks will be very quiet.
- The serial port.
Personally if a recap doesn't do it, then I usually install a Meanwell RD-50A. They fit in place of the old PSU and have both 5v and 12v and more than enough amperage to meet the requirements of the machine.
Whilst I see a lot of USB C solutions out there you can't beat a Meanwell as a solid replacement.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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chakobsa
- Posts: 14
- Joined: 20 Feb 2024 20:58
- Location: England
Re: STe PSU
I used the Meanwell RD50 A in my ST and used the following bracket https://www.thingiverse.com/thing:5176234
You need to move your existing psu switch over so you won't have 2 psu s if you recap the original.
The Meanwell is rock solid and stable.
Ive seen good things about the uSB c psu from Sidecartidge.
You need to move your existing psu switch over so you won't have 2 psu s if you recap the original.
The Meanwell is rock solid and stable.
Ive seen good things about the uSB c psu from Sidecartidge.
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moger4
- Posts: 18
- Joined: 29 May 2025 11:33
Re: STe PSU
yes i had been down a rabbit hole with advice on voltages but thanks i had figured out the voltages , im really looking for the metal stand or a 3D print model of such , although the mean well is interesting im fascinated by the USB solution i dont know why , its kind of like blu tooth an obsession !! ha ha harubber_jonnie wrote: 28 Dec 2025 00:08 Don't forget, you will ultimately need both 5v and 12V to be fully functional. so you'll need to have a solution that does all of that.
So consumers of 12v are:
There may be others, but it's late and that's all I can remember!!!
- Floppy drive, but only if the drive requires 12v. Not all drives do and Goteks only need 5v.
- The audio amp. Without it the sound output from the RCA jacks will be very quiet.
- The serial port.
Personally if a recap doesn't do it, then I usually install a Meanwell RD-50A. They fit in place of the old PSU and have both 5v and 12v and more than enough amperage to meet the requirements of the machine.
Whilst I see a lot of USB C solutions out there you can't beat a Meanwell as a solid replacement.
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moger4
- Posts: 18
- Joined: 29 May 2025 11:33
Re: STe PSU
yes i have looked at that and its a nice sturdy looking print , i also found the whole stand for a mega STe PSU which would need adapting but i haven't had any experience of doing design on cad so its a bit beyond me to make a good fist of itchakobsa wrote: 28 Dec 2025 11:44 I used the Meanwell RD50 A in my ST and used the following bracket https://www.thingiverse.com/thing:5176234
You need to move your existing psu switch over so you won't have 2 psu s if you recap the original.
The Meanwell is rock solid and stable.
Ive seen good things about the uSB c psu from Sidecartidge.
https://www.thingiverse.com/thing:7023738
or an actual spare would be great but i simply cant find one out there
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moger4
- Posts: 18
- Joined: 29 May 2025 11:33
Re: STe PSU
sorry i havent replied i have been ill , thanks for the advice i can look into running a 20v laptop PSU with a couple of nice buck converters also need to find a 3d print for a back and something to fill the holesmoger4 wrote: 28 Dec 2025 16:27yes i have looked at that and its a nice sturdy looking print , i also found the whole stand for a mega STe PSU which would need adapting but i haven't had any experience of doing design on cad so its a bit beyond me to make a good fist of itchakobsa wrote: 28 Dec 2025 11:44 I used the Meanwell RD50 A in my ST and used the following bracket https://www.thingiverse.com/thing:5176234
You need to move your existing psu switch over so you won't have 2 psu s if you recap the original.
The Meanwell is rock solid and stable.
Ive seen good things about the uSB c psu from Sidecartidge.
https://www.thingiverse.com/thing:7023738
or an actual spare would be great but i simply cant find one out there
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