Enterprise Forever

:UK => Hardware => Topic started by: John Fante on 2022.January.11. 12:00:13

Title: 9v or 12v from PSU?
Post by: John Fante on 2022.January.11. 12:00:13

This maybe a dumb question but should the standard PSU output 9v og 12v and does it make any difference?

On my PSU it says that it outputs 9v but when I measure it really outputs 12v :?: (no load)

I have tried with a new high quality 9v PSU and the computer works fine with 9v.

This is rather old equipment and I do not want to strain things.

Title: Re: 9v or 12v from PSU?
Post by: Tuby128 on 2022.January.11. 12:25:54

Can you show me a picture about your power supply?

Title: Re: 9v or 12v from PSU?
Post by: Zozosoft on 2022.January.11. 12:35:07

Yes, it is normal, without load will be higher voltage on old PSU. With load need to be 9V (German PSU) or 9.5V (UK PSU (https://gafz.enterpriseforever.com/Galery/Alapgep/Picture/IM000729.jpg)).

Title: Re: 9v or 12v from PSU?
Post by: John Fante on 2022.January.11. 12:45:16

Aha. Thank you for the reply! :)

Just in case (@Tuby128). Here is a picture of the PSU:

https://www.dropbox.com/s/c3tp0s5xf4dvdef/PSU.jpeg?dl=0

And here is a picture of the reading:

https://www.dropbox.com/s/n8nuyccmn3xa8lx/Measurement.jpeg?dl=0

Title: Re: 9v or 12v from PSU?
Post by: Tuby128 on 2022.January.11. 12:58:16

Ok you were talking about the old supply, not a new one, i see.
The circuit has a capacitor inside, without load (EP) the voltage goes to the peak value which is 12V. After you connect the load (EP) the voltage will be sink to 9V level.

Title: Re: 9v or 12v from PSU?
Post by: John Fante on 2022.January.11. 14:12:21

@Tuby128

Aha. Great to know :)