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PSU 230V vs 110V

Posted: Tue Jul 10, 2018 11:46 am
by exxos
(Table values will be updated as they are worked out)

It looks like there are just some small resistor changes around the main drive transistor. Makes sense that higher voltages also tally with higher voltage resistors..

230_110.jpg
230_110.jpg (4.91 MiB) Viewed 1786 times


PART 230V 110V
R9 0.33R 0.27R
R2 51K 39K
R2A 51K N/F
R7 33K 15K
C5 47uF/400V 47uF/200V
T1 230V / 0.45A 117v / 0.9A

Re: PSU 230V vs 110V

Posted: Thu Jul 12, 2018 4:17 pm
by mikro
From what I can see, the caps are also a bit different (for less voltage, that is). If you want, I can write the values down for you.

Re: PSU 230V vs 110V

Posted: Thu Jul 12, 2018 4:44 pm
by exxos
mikro wrote:
Thu Jul 12, 2018 4:17 pm
From what I can see, the caps are also a bit different (for less voltage, that is). If you want, I can write the values down for you.
ahh, yeah, the main cap will be different voltage, but think others will be the same.

Re: PSU 230V vs 110V

Posted: Thu Jul 12, 2018 5:02 pm
by exxos
Actually the transformer may be different..

Mine (230V) has :

ATR-L043-1
AC INPUT 50/60Hz
230V / 0.45A

Re: PSU 230V vs 110V

Posted: Thu Jul 12, 2018 6:40 pm
by mikro
Yes, that note about the transformer is a good point (and a huge overlook on my side).

ATR-L043-2
AC INPUT: 50/60 Hz
117v / 0.9A

The big cap: 47uF / 200V
The three second-biggest caps: 1000uF / 16V
The slightly smaller cap near the big three: 330uF / 25V
The three small caps: 2x 47uF / 25V & 22uF / 25V (in the center of the PSU)

So I guess I have my answer? It would seem I can't simply change caps and resistors to get a 230V one.

Re: PSU 230V vs 110V

Posted: Thu Jul 12, 2018 6:47 pm
by exxos
mikro wrote:
Thu Jul 12, 2018 6:40 pm
Yes, that note about the transformer is a good point (and a huge overlook on my side).
So I guess I have my answer? It would seem I can't simply change caps and resistors to get a 230V one.
Looks like you would need to change the transformer , plus cap & resistor changes.. getting on for a re-build really it seems.

Re: PSU 230V vs 110V

Posted: Thu Jul 12, 2018 7:18 pm
by mikro
exxos wrote:
Thu Jul 12, 2018 6:47 pm
Looks like you would need to change the transformer , plus cap & resistor changes.. getting on for a re-build really it seems.
... or put your PSU instead. :) Nobody can blame me for not trying! I guess I'll change the exploded cap, test it (on 110V this time) and sell it without the base.

Chris, if you think you could use it for your experiments, I'll gladly donate it to you.

Re: PSU 230V vs 110V

Posted: Thu Jul 12, 2018 10:01 pm
by exxos
mikro wrote:
Thu Jul 12, 2018 7:18 pm
Chris, if you think you could use it for your experiments, I'll gladly donate it to you.
If it unfixable then sure , can look a bit closer at parts I guess.

Re: PSU 230V vs 110V

Posted: Fri Jul 13, 2018 2:41 pm
by mikro
exxos wrote:
Thu Jul 12, 2018 10:01 pm
mikro wrote:
Thu Jul 12, 2018 7:18 pm
Chris, if you think you could use it for your experiments, I'll gladly donate it to you.
If it unfixable then sure , can look a bit closer at parts I guess.
Posted today. Surely it's fixable but I have realised that I'm too lazy to desolder the cap(s), investigate which (quality) ones I need to purchase, order it, wait, solder, obtain a 110V power source and then finally put on eBay. If it helps you to extend your knowledge or improve your products, that's a much better reward.

Re: PSU 230V vs 110V

Posted: Fri Jul 13, 2018 2:43 pm
by exxos
mikro wrote:
Fri Jul 13, 2018 2:41 pm
Posted today. Surely it's fixable but I have realised that I'm too lazy to desolder the cap(s), investigate which (quality) ones I need to purchase, order it, wait, solder, obtain a 110V power source and then finally put on eBay. If it helps you to extend your knowledge or improve your products, that's a much better reward.
Cool thanks :) Yeah, will investigate it when I get a moment. Probably worth documenting blown stuff should someone else do it in the future ;)