| Electronics > Projects, Designs, and Technical Stuff |
| Planning to build benchtop 500V tube PSU, help needed. |
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| 001:
Great work :-+ :-+ :-+ :-+ :-+ --- Quote from: ArthurDent on February 09, 2019, 03:32:53 am --- What I’m using now is an electrophoresis power supply made by Bio-Rad --- End quote --- Why? Can You post Biorad schematics? |
| ArthurDent:
The Bio-Rad power supply I have is a complex microprocessor based switching power supply and even if schematics were available it would be basically impossible to duplicate it. As you can see from the photo of its LCD screen below it displays a lot of info and has timers and open circuit protection among other neat features, some of which are only applicable to its original use. A lot of the parts are not off the shelf items and the firmware would not be available. It is nice to be able to see the output voltage, current , and wattage all on one screen. While all this discussion of regulated supplies is interesting, I don't really think one is necessary because no audio amplifier I’ve seen needed one to operate. The output stages are generally push-pull and quite tolerant of power supply ripple and varying supply voltage. The drain of the previous stages is generally a few milliamps at a lower voltage which is easy to obtain and filter from the raw HV feeding the output stage. There is nothing wrong with making or buying an adjustable regulated supply but the one you showed and the small old one I have just wouldn't be suitable for your application as others have pointed out because of the limited current output. As to a suitable 300-400VDC max supply at up to 400Ma, it would probably be best to buy one and there are a lot of them on eBay similar to the type I bought but you're taking a chance on anything you buy, guessing if it will work for what you want. |
| 001:
--- Quote from: ArthurDent on February 12, 2019, 01:16:15 am ---The Bio-Rad power supply I have is a complex microprocessor based switching power supply and even if schematics were available it would be basically impossible to duplicate it. As you can see from the photo of its LCD screen below it displays a lot of info and has timers and open circuit protection among other neat features, some of which are only applicable to its original use. A lot of the parts are not off the shelf items and the firmware would not be available. It is nice to be able to see the output voltage, current , and wattage all on one screen. --- End quote --- Yea it`s really meaningless And what about this analog beauty? I can`t google schematic for it |
| gbaddeley:
EL34 PL509 PL519 or 807, in parallel to get enough current & power handling, possibly triode connected |
| TERRA Operative:
Well, regarding transformers, I can get custom transformers wound here in Japan for a not tooo ridiculous price, so getting a 750V CT transformer wound with more current capability should be doable. I'll have to inquire what the cost will be but maybe I can get one rated to 500mA output or so. |
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