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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 22nd Sep 2021, 1:06 pm   #1
6SN7WGTB
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Default Wanted: high voltage DC variable PSU

Looking for a high voltage bench variable PSU.

My ideal is a vintage Kikusui 0-350V DC 0.2A variable supply, which looks just like the two 0-32V 1.8A ones I currently have.

(Their current one, excuse the pun, is 700! and has lots of sophistication I don't need).

I don't want anything into the kV range.

I was planning to make one, but it's a project I could forego if I could buy.
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Old 22nd Sep 2021, 3:26 pm   #2
Ed_Dinning
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Default Re: Wanted: high voltage DC variable PSU

Hi, Farnell did a series or units like this at upto 350v. They often cone up on auction sites and manual or schematics are readily available

Ed
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Old 22nd Sep 2021, 5:04 pm   #3
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Default Re: Wanted: high voltage DC variable PSU

I realise it means building one but Elektor did a project that plugged into a regular 0-30V PSU and raised the output to 0-300V - basically a x10 multiplier. It did, of course, rely the original PSU for overload protection but that's only a good thing!

It was a 'simple' SMPS design but required a hand wound transformer. Given the potential difficulties of sourcing a HV PSU this doesn't seem to be a bad option and maybe something worth doing over the cold winter nights?

I also purchased a couple of small SMPS HV supply modules from the far East that can vary from 100-300V based on a stable 12V DC input.
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Old 22nd Sep 2021, 5:24 pm   #4
6SN7WGTB
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Default Re: Wanted: high voltage DC variable PSU

I have transformers around that would do the job, plus I'd use that nifty HV 3-terminal regulator - LR8 I recall, plus a pass transistor as although I really only want low current, the LR8 maxes out at 30mA.

But I would want a professional job with meters and so on, so it soon gets to be a serious project.
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Old 22nd Sep 2021, 5:31 pm   #5
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Default Re: Wanted: high voltage DC variable PSU

I think the tricky part is making them robust against any faults in the load. This is where a professional one might win out.

Cheers,

GJ
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Old 22nd Sep 2021, 5:38 pm   #6
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Default Re: Wanted: high voltage DC variable PSU

Quote:
Originally Posted by GrimJosef View Post
I think the tricky part is making them robust against any faults in the load. This is where a professional one might win out.

Cheers,

GJ
Well, exactly, I nearly added to my last post "plus I want/need current regulation"...!
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Old 22nd Sep 2021, 6:28 pm   #7
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Default Re: Wanted: high voltage DC variable PSU

There is always this which could be a good starting point, whether it can be modified to go all of the way down to 0v is any ones guess:-

https://www.ebay.co.uk/itm/172465661600?
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Old 22nd Sep 2021, 6:35 pm   #8
Peter F4VSA
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Default Re: Wanted: high voltage DC variable PSU

I have one of the Farnell HV power supplies and they work well. Maybe just copy the circuit. It's available online and uses one or two EL34's
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Old 22nd Sep 2021, 10:27 pm   #9
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Default Re: Wanted: high voltage DC variable PSU

Quote:
Originally Posted by wave solder View Post
There is always this which could be a good starting point, whether it can be modified to go all of the way down to 0v is any ones guess:-

https://www.ebay.co.uk/itm/172465661600?
I bought a stack of these little supplies. They work very well excepting they are a little noisy on the output. I will be using them in my valve tester which I am still designing.

Joe
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Old 22nd Sep 2021, 11:56 pm   #10
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Default Re: Wanted: high voltage DC variable PSU

This works well.
Tried it for my valve tester, another idea I am looking at.
Attached Files
File Type: pdf HVsupply.pdf (310.6 KB, 42 views)
File Type: pdf HVsupply2.pdf (330.5 KB, 28 views)
File Type: pdf HVsupply3.pdf (391.0 KB, 22 views)
File Type: pdf HVsupply4.pdf (290.3 KB, 21 views)
File Type: pdf HVsupply5.pdf (329.5 KB, 20 views)
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Old 22nd Sep 2021, 11:57 pm   #11
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Default Re: Wanted: high voltage DC variable PSU

Last page.
Attached Files
File Type: pdf HVsupply6.pdf (360.1 KB, 31 views)
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Old 23rd Sep 2021, 8:49 am   #12
woodchips
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Default Re: Wanted: high voltage DC variable PSU

Look out for the Roband Varex supplies. I have several 60-1 which give two 60V 1A supplies that can be stacked to give 120V, then can stack other supplies to give 240V or 360V, and the current limit works over the whole stack, I tried it, impressive.
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Old 23rd Sep 2021, 9:48 am   #13
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Default Re: Wanted: high voltage DC variable PSU

Hi!

Any good?

https://www.ebay.co.uk/itm/HSPY-400-...-127635-2958-0

. . .there is also a 300V version available as well!

(Alas to say the seller's description is total gobbledygook nonsense I'm afraid, but this range does look like it meets your needs!)

Chris Williams
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Old 23rd Sep 2021, 10:53 am   #14
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Default Re: Wanted: high voltage DC variable PSU

PS!

I these are available in the UK from UK sellers as well, by the way!

Chris Williams
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Old 23rd Sep 2021, 9:03 pm   #15
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Default Re: Wanted: high voltage DC variable PSU

Provided that you have accumulated a substantial collection of parts over the years and if you have enough time, etc., yes, you can build your own. That was what I did about 35 years ago - and it still works O.K., albeit that it has had a few 'refinements' made to it over the years!

Brief spec.:
Four HT outputs:
1. HT+1: 100 - 400 v.d.c., 200 mA, regulated.
2. Same as above: HT+2.
3. HT-: 30 - 60 v.d.c., regulated.
4. HT+ 3: 650 v.d.c., 200 mA, unregulated.
Plus: 6.3 v.a.c. @ 5 A.

Three mains xfmrs.; HT+1 & HT+2 pass valves are 12E1; two EF91; two 0B2 stabilizers; time-delay relay that operates at mains switch-on, giving the valve heaters adequate time to warm-up; two cooling fans.

Obviously, a substantially simplified and reduced spec. version could be built, depending on one's needs.

Al. / Sept. 23rd., '21
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Last edited by Skywave; 23rd Sep 2021 at 9:10 pm. Reason: General tidy-up, etc.
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Old 24th Sep 2021, 7:38 am   #16
6SN7WGTB
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Default Re: Wanted: high voltage DC variable PSU

Quote:
Originally Posted by woodchips View Post
Look out for the Roband Varex supplies. I have several 60-1 which give two 60V 1A supplies that can be stacked to give 120V, then can stack other supplies to give 240V or 360V, and the current limit works over the whole stack, I tried it, impressive.
I did consider adding a 0-160V I saw available to the two 0-32V I have but the specs state a maximum floating voltage of 175V on the 32V ones so this didn't look like a runner.
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Old 24th Sep 2021, 7:39 am   #17
6SN7WGTB
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Default Re: Wanted: high voltage DC variable PSU

Quote:
Originally Posted by Skywave View Post
Provided that you have accumulated a substantial collection of parts over the years and if you have enough time, etc., yes, you can build your own. That was what I did about 35 years ago - and it still works O.K., albeit that it has had a few 'refinements' made to it over the years!

Brief spec.:
Four HT outputs:
1. HT+1: 100 - 400 v.d.c., 200 mA, regulated.
2. Same as above: HT+2.
3. HT-: 30 - 60 v.d.c., regulated.
4. HT+ 3: 650 v.d.c., 200 mA, unregulated.
Plus: 6.3 v.a.c. @ 5 A.

Three mains xfmrs.; HT+1 & HT+2 pass valves are 12E1; two EF91; two 0B2 stabilizers; time-delay relay that operates at mains switch-on, giving the valve heaters adequate time to warm-up; two cooling fans.

Obviously, a substantially simplified and reduced spec. version could be built, depending on one's needs.

Al. / Sept. 23rd., '21
Super unit! Thank you for the suggestion.
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Old 24th Sep 2021, 7:41 am   #18
6SN7WGTB
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Default Re: Wanted: high voltage DC variable PSU

Quote:
Originally Posted by joebog1 View Post
Last page.
Thanks for that article - hadn't come across that as seems hard to find EA historical issues now.
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Old 24th Sep 2021, 7:44 am   #19
6SN7WGTB
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Default Re: Wanted: high voltage DC variable PSU

Quote:
Originally Posted by Chris55000 View Post
Hi!

Any good?

https://www.ebay.co.uk/itm/HSPY-400-...-127635-2958-0

. . .there is also a 300V version available as well!

(Alas to say the seller's description is total gobbledygook nonsense I'm afraid, but this range does look like it meets your needs!)

Chris Williams
Not seen that!

It claims to be linear but I cannot see that possible given the size.

400V at 1A in a linear supply would need a very large heatsink somewhere if you wound it down to a few volts...
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Old 24th Sep 2021, 8:01 am   #20
Ed_Dinning
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Default Re: Wanted: high voltage DC variable PSU

Hi Al, any chance of your schematic (with refinements if possible as I'm sure others here would be very interested

Cheers, Ed
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