Advice on a +150VDC/-100VDC power supply - diyAudio
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Old 22nd September 2012, 05:53 PM   #1
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Default Advice on a +150VDC/-100VDC power supply

I am looking to build a power supply for a tube circuit and need to supply two voltages, +150VDC, and -100VDC. I have built a fair number of power supplies for tube circuits, but never one that provides negative voltage. I would be most appreciative if someone could explain, or provide an example, of a power supply for tube circuits that provides negative voltages (I have the suspicion it is a pretty simple trick). As for the current requirements, they will be large (driving >50 tubes); I will deal with this as a second phase of the design activity ...

Many thanks
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Old 23rd September 2012, 07:52 AM   #2
Elvee is offline Elvee  Belgium
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First thing to do is to decide which is your "main" supply (power? ...), implement it in a normal way, and then see if it is possible to derive your other voltage simply and efficiently.
Do you already have a base? Can you post the schematic (and the requirements)
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Old 23rd September 2012, 10:05 AM   #3
AndrewT is offline AndrewT  Scotland
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same current fro both polarities?
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Old 23rd September 2012, 05:46 PM   #4
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Mains voltage are 120VAC; the current requirements will be much larger for +150VDC; -100VDC is for bias.

Sounds a bit odd I'm sure - I am building a digital circuit using tubes as a crazy project.
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Old 23rd September 2012, 07:17 PM   #5
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by DrExotica View Post
the current requirements will be much larger for +150VDC; -100VDC is for bias.
Then the 150V can be processed normally, and the -100V can easily be derived by a wart charge pump grafted onto the main rectifier.
The voltage will be too too high, but that is not a problem if the power is reasonable.
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Old 23rd September 2012, 11:49 PM   #6
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Hi Elvee.

Thanks so much for the info. I must appologize but I am not familiar with a 'wart charge pump'. Any additional info/clarrification would be most appreciated. Many thanks.

for fun, search for 'IBM 604' for some cool schematics if you're an EE guy ...
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Old 24th September 2012, 03:17 AM   #7
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if your transformer is center tapped use a full wave bridge. You will get +/- whatever and then you can regulate down.
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Old 24th September 2012, 12:23 PM   #8
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by DrExotica View Post
Mains voltage are 120VAC; the current requirements will be much larger for +150VDC; -100VDC is for bias.
This example will provide +150V@1A and -100V@10mA from 120VAC.

Values can be adapted to suit your exact requirements.
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