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 Post subject: Home Brew HVPS
PostPosted: Nov Tue 28, 2017 5:28 am 
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Joined: Dec Tue 01, 2015 5:31 am
Posts: 582
Location: Columbus Ohio
I needed a high voltage power supply for reference, not to power anything.
So I got one of those little boards from China, makes an old 9volt battery produce
up to 700 vdc and 600vac.
This was an old Lafayette speaker, the case is 8" tall. I think the big meter makes it. Gold hammered finish over red primer.
Should work well enough to check and calibrate VTVM's needing a high reference.
Get some better labels, white on clear and black on clear.


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 Post subject: Re: Home Brew HVPS
PostPosted: Nov Tue 28, 2017 11:42 pm 
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Joined: Sep Sat 15, 2012 1:36 pm
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Very nice work


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 Post subject: Re: Home Brew HVPS
PostPosted: Nov Tue 28, 2017 11:54 pm 
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Joined: Jul Thu 29, 2010 5:35 am
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Location: Simonton, Texas
Looks good to me.

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 Post subject: Re: Home Brew HVPS
PostPosted: Nov Wed 29, 2017 12:21 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Monte Vista, CO. USA
I give it an A+!


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 Post subject: Re: Home Brew HVPS
PostPosted: Nov Wed 29, 2017 12:31 am 
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Joined: Dec Tue 01, 2015 5:31 am
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Location: Columbus Ohio
thank you all

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 Post subject: Re: Home Brew HVPS
PostPosted: Nov Wed 29, 2017 12:58 am 
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Location: Haledon, NJ, usa
glue_ru wrote:
thank you all

Looks nice.
I'm curious what you need the reference for?

I repair tons of these old radios and never needed anything like that.

I do have a nice variable HV supply that was recently given to me. It goes up to about 300v DC @ maybe 60-70ma
It comes in handy for testing tube amp designs.

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 Post subject: Re: Home Brew HVPS
PostPosted: Nov Wed 29, 2017 2:25 am 
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Joined: Dec Tue 01, 2015 5:31 am
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Location: Columbus Ohio
I've been repairing a lot of VTVM's. I'd like to get some higher voltages to check the scales, without putting out a couple hundred
for a proper HVPS. I've got $24 in this, it gets up to 700 vdc, though goes higher. Doubtful much amps behind that, but dont' need any. I took off the 104k trimmer pot and wired in an external 50K, waiting for a 100k pot. The 50K isn't smooth and has bad spots in the carbon trace, old.
I think it was the B&K 375 that wanted some high volts for calibration. Lately finishing up 4 Heathkit IM-13/28's.
Previous all the vdc I could get was chaining together 9 volt batteries, all 3 of them !! or drag out the Hammarlund 170 and use it for high volts.

Used this: https://www.ebay.com/itm/DC-5V-12V-Step ... 2749.l2649

Meter; https://www.ebay.com/itm/1PC-6C2-Rectan ... 2749.l2649

Case, $5
Meter, $9
HV pcb, $7
Speaker posts, $3
Rotary pot. salvaged from sencore TV stuff, new one coming at $2

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 Post subject: Re: Home Brew HVPS
PostPosted: Nov Wed 29, 2017 3:20 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Minneapolis, MN USA
I like it.
For those who don't need a "calibrator" how about a "tester" instead ?
Everybody needs more testers on their bench.
A cheap and practical way to ensure the upper ranges on a VTVM are still in the ballpark.

Good choice to use a 9v battery for the source voltage. It's limited current plus the current loss due to step up function will limit the output current to safer human contact levels when the output voltage it high.


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 Post subject: Re: Home Brew HVPS
PostPosted: Nov Wed 29, 2017 3:21 am 
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Joined: Dec Tue 01, 2015 5:31 am
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Location: Columbus Ohio
Thanks Dale, the best part is the old 9v batteries that are too weak for other gear, work just fine in this.
And its just a reference tool, doubtful good for much else.

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 Post subject: Re: Home Brew HVPS
PostPosted: Dec Fri 01, 2017 12:29 am 
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Joined: Dec Tue 01, 2015 5:31 am
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Location: Columbus Ohio
Here is an interesting Labvolt power supply. The AC outlets aren't marked as isolated or variable. I have another model that varies AC, too bad that's not combined in this, with some meters, would be cool.


https://www.ebay.com/itm/LAB-VOLT-Vacuu ... 0005.m1851

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