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High Voltage Regulator Circuit Help

NantachieRat

Aug 4, 2013
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I am working on a power supply for vacuum tube circuits. It is a full wave voltage doubler with an input of 120 Vrms fron the transformer secondary. It gives a B+ of 330 Vdc. I need a regulator circuit to be able to get a B+ of 125 to 250 volts. I have several high voltage transistors and I was wondering if anyone knows of a configuration that would work.
 

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GonzoEngineer

Dec 2, 2011
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What you need is called a Buck Regulator, and is easily implemented with a series switch, inductor and capacitor. You can control the series switch with a PWM chip.
 

techiesteve

Jul 27, 2013
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Do you intend your HT to be variable between 125V - 250V, and what current do you need to supply?
 

NantachieRat

Aug 4, 2013
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What you need is called a Buck Regulator, and is easily implemented with a series switch, inductor and capacitor. You can control the series switch with a PWM chip.

Do you mean use a transistor as a series switch and configure the coil and cap as a choke input filter?
 

duke37

Jan 9, 2011
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500MA. You don't do things by half !

Give us a specfication of your requirement including realistic current, voltages (fixed or variable) and ripple.

What will the power supply be used for, a large amplifier should be able to manage 330V?
 

BobK

Jan 5, 2010
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500MA at 250V is 125 Gigawatts (pronounced Jigawatts)!

Doc Brown
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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NantachieRat, Duke and BobK are pulling your leg. I think they know that you mean 500 milliamps, but you wrote 500 MA, which is 500 mega-amps. 500 milliamps should be written 500 mA. The difference is important; we are engineers here.
 

NantachieRat

Aug 4, 2013
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NantachieRat, Duke and BobK are pulling your leg. I think they know that you mean 500 milliamps, but you wrote 500 MA, which is 500 mega-amps. 500 milliamps should be written 500 mA. The difference is important; we are engineers here.

They don't bother me! I am down to 145 MA wide open, this is the point where voltage begins to fall off rapidly with any increase in current. I am looking at a working load of 60 to 70 MA. I have a schematic I'd like you to look at, it is a vacuum tube type regulator for high voltage tube circuits. I have several hundred tubes on hand, and I have some tube experiments, so I am going to try to build an all tube voltage regulator. Please excuse the typo! I did mean mA. I consider myself an engineer too!
 

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KrisBlueNZ

Sadly passed away in 2015
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I am down to 145 MA wide open,

I consider myself an engineer too!

In that case, why are you repeating your error? Because writing mega-amps when you mean milliamps is not a cool way to advertise your uniqueness; it's a way to be wrong and embarrass yourself.
 

duke37

Jan 9, 2011
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The tube circuit you show looks good. There could be problems with stability as with any feedback amplifier. Do not exceed the power rating of the 6080.

Great care is necessary in using correct units. Sloppy use has caused several disasters.
 
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