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Author Topic: EP128 power supply (Read 396 times)

Offline teo

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EP128 power supply
« on: 2020.November.14. 14:30:58 »
Hi, does anyone have an EP128 power supply for sale or know where to find it?

Thanks,
Marco

Offline geco

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Re: EP128 power supply
« Reply #1 on: 2020.November.14. 14:35:09 »
i do not have, but if i remember well it was mentioned on the forum, speccy psu is good, just the polarity should be changed.

Offline geco

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« Last Edit: 2020.November.14. 15:00:37 by geco »

Online gflorez

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Re: EP128 power supply
« Reply #3 on: 2020.November.14. 16:37:13 »
i do not have, but if i remember well it was mentioned on the forum, speccy psu is good, just the polarity should be changed.

¡NO, please! Spectrum PSUs have the same polarity, Ground at the centre and +9V at the outside ring.

The UK Enterprise came with a 2Amp PSU, and the German one with an 1,3A, as can be seen on this picture:



The gummy Spectrum had a 1A PSU, probably insufficient, but the Spectrum+ and following reincarnations had a better suited PSU that can serve perfectly for an EP.
« Last Edit: 2020.November.14. 16:49:51 by gflorez »

Offline Judge

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Re: EP128 power supply
« Reply #4 on: 2020.November.14. 17:14:14 »
It's very simple.

You buy this (Voltcraft SPS12-24W 2000mA) :

25767-0

Its performance corresponds to the EP. You will set it to 9v.
Polarity switching is easy to perform.

25769-1

I've been using one for a long time
« Last Edit: 2020.November.14. 17:43:28 by Judge »
Üdv.Judge

Offline elmer

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Re: EP128 power supply
« Reply #5 on: 2020.November.15. 18:12:34 »
These days I would generally recommend that people buy a modern high quality 9V 2000ma DC 5.5x2.1mm center-negative switching power supply, rather than use an old transformer-based power supply (like the old Spectrum PSU).

I recommend that you avoid cheap power supplies because they produce a lot of high frequency noise that can mess up sensitive computer circuits, and it is worth paying a little more for something that known to work with sensitive electronics.

Since I am in the USA, I use this, and it looks like the same power supply is available in Italy here.

Offline Zozosoft

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Re: EP128 power supply
« Reply #6 on: 2020.November.15. 18:39:08 »
I use this, and it looks like the same power supply is available in Italy here.
These are come with right size and polarity plug? Or need to replace it?

Offline elmer

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Re: EP128 power supply
« Reply #7 on: 2020.November.15. 20:04:50 »
These are come with right size and polarity plug? Or need to replace it?

It is exactly the right size and polarity plug for the Enterprise (and also a lot of game consoles from the 1980s and early 1990s, which is why I had one around to test).

Offline dangerman

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Re: EP128 power supply
« Reply #8 on: 2020.November.15. 21:09:24 »
I used a Spectrum+ power supply for a while and I can confirm it was the right polarity. Although the voltage seemed a little higher than the Enterprise one.

Overall, I wouldn't recommend it. A switching PSU like Elmer suggests would give a more stable supply. I use something similar to that now.