| Electronics > Projects, Designs, and Technical Stuff |
| SMPS for vacuum tube power amplifiers.(status: back at it) |
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| SK_Caterpilar_SK:
--- Quote from: daedalux on April 05, 2019, 09:52:39 pm ---Never give up, just aim what you want to do in the good direction. What I wanted to warn you is that with the voltages and kind of equipment you are working with you should setup a isolation transformer for power, fuses and a 15mA residual current breaker that you'll set in the isolated zone, if you can't find one at least put a 30mA one that you'll find anywhere. I'm talking about your test set not what you design. This is very useful and needed for mains work, the transformer is usually multitapped which is useful and the breaker and fuses protect not only you but your test gigs and the parts you are working with. --- End quote --- My bench is isolated and has that breaker..I thought of that little earlier, not cheap to get that residual breaker but I have it. The bench has its own breaker, and right at the bench there are two more low amp quick breakers one is for the variac. and the variac on the secondary side of the isolating transformer is wired trought the GFCI or whats it called. The isolation transformer is not multitapped, I had it made specifically for me on order. I did not need multi taps because why would I and the voltage arround here does not fluctuate. Living right next to the transformer station. My equipment is old id say very retro, for high voltage measurements I use a VTVM, you cant just about destroy one of those. All other measurements were done with my OWON multimeter but the turning knob is dodgy and it falied and it was brand new. So now I use my old nixie bench meter, works good, im happy with it, just a little space consuming but very nicely readable. But I might just not continue with the project I wanted to do, because of the negative feedback I got. |
| TERRA Operative:
Nah, forget the haters, you have my interest and support. I am planning on doing the sxact same thing as a friend wants to make a lightweight, ultra portable guitar amp for taking to gigs. A heavy traditional amp is a bit hard to take on the Tokyo subway..... small and light is the key. :) So far, I plan to build two supplies, one HV PSU and one filament PSU, so it is more modular for reuse in other projects. I was thinking of adding a status output from the filament PSU that would go high once the filaments warmed up (current monitoring, time limit e5c) which would feed into an input on the HV PSU to only bring it online when the tubes are ready. This will also allow for the usual 'standby' switch you se on a lot of amps to be able to be used still. I'm just at the concept stage of my project, so I'm just starting my design at the moment. Keep at it, and don't let the haters get you down. :) |
| schmitt trigger:
@SK_Caterpillar_SK Haters will always hate. Most so if they are shielded from you by the web's anonymity. Don't pay attention to them. I once got flamed big time because I dared to publish the design of a switching filament regulator! Calling me ignorant was the tamest insult I received. Your project looks very nice to me. Keep on experimenting, and be sure continue to post your results here. The only suggestion I would provide you, is that after thoroughly debugging them, clean them very well with IPA and then proceed with a spray-on acrylic conformal coat. That will prevent pesky humidity and dust from depositing across traces and creating leakage paths. |
| Circlotron:
SK_Caterpillar_SK, We actually understand what you are doing We are with you all the way The opinions of people that have no understanding of what you are doing are worthless. |
| theworldbuilder:
Hey SK_Caterpillar_SK, Just wanted to say that I'd be really interested in seeing this project progress. I'd definitely be interested in a smps for tube applications. I've been tinkering with my own SMPS for tubes for the same reason; I can't afford power transformers. But I've only ever built low power MC34063 based supplies which have tons of audio level buzz. I'd love to see what you've come up with so far and to see you develop this into a fully functional system! Keep it up! Never mind the audio snobs on the other board. I understand their wish to keep it transformer only, but it's just not practical. It's too expensive as you said. |
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