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In Reply to: RE: Little Switcher posted by Triode_Kingdom on November 21, 2016 at 18:13:52
Well, I wish I had waited to read this before I ordered two of them to use on the filaments of the 26's. Oh, well we'll see what happens. Maybe I can tack one of my filters on it and clean it up a bit. I wonder at what rating they put the other goodies back in?
Edits: 11/22/16Follow Ups:
As I explained before, your filter won't clean it up. There's some improvement due to the additional shunt capacitance, but a common mode choke does virtually nothing in this situation. All this differential output noise will just pass right through.
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Buy Chinese. Bury freedom.
I understand what you are saying, but it sounds better with my filter than without, and until I hear something I don't like I think I will settle for that. I can always do more later.
OK, I just wanted to be sure I was getting the point across. Maybe tonight I'll go into the small switcher and see how high I can raise the frequency. I have no idea what the response of the various components might be. The limiting factor is probably the output transformer.
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Buy Chinese. Bury freedom.
Well, the joke's on me. The "transistor" on the back wall is actually a 5-leg PWM controller. There are three versions of the part; "L," "M," and "H." Mine is "M," which means (what else?) the frequency is fixed at 66 kHz. I could buy the 100 kHz "H" version (actually a KA5H0265R) on eBay from Hong Kong or Malaysia, but that doubles the cost of this little switcher. Guess I'll just have to resign it to my original intended use of DC for my 12SL7s. Proving that higher frequency ultrasonic heating is feasible will have to wait for another day.
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Buy Chinese. Bury freedom.
I will be really curious to see how the 3 amp model works on the 26. Mine are due to get here today or tomorrow. Thanks for the post.
As with the 813 supply, the primary concerns will be that neither output terminal is grounded and the output voltage is reasonably clean. Maybe when you get them, you could open the case and tell me which controller they use? I'd like to order the 5A versions for some experiments, but it's a crapshoot regarding the ability to modify the frequency. Too bad they don't include the controller type in the auction descriptions.
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Buy Chinese. Bury freedom.
It didn't make it in today's mail, but I am hopeful for tomorrow. I will let you know when they get here.
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