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Old 11th October 2012, 08:18 PM   #11
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Sorry, I presume one would control a grid voltage or something with a potentiometer.

I will look into producing a fixed power supply. Many thanks.
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Old 11th October 2012, 08:44 PM   #12
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If someone could give me a suitable transformer number, I'd be very grateful.

I will find a rectifier which will suit it, although if you know of a combo which would work together, that would be great too.

Sorry to be a pain, but I'd like to know I'm not wasting money.
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Old 12th October 2012, 08:28 AM   #13
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Sparky49 View Post
Sorry, I presume one would control a grid voltage or something with a potentiometer.

I will look into producing a fixed power supply. Many thanks.
Yes you would use a pot for that. To make a variable PSU that can supply a bit of current (which the pot can't) can be done easily. All you need is the basic unregulated supply (say 300 volt) and to add a high voltage high power series pass transistor (actually two to make a darlington) and feed the base from a pot. One resistor and one more transistor will add current limiting and protection.
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