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Interior surface coating of a copper resonant microwave cavity?
Do most people just leave the interior surface with a nominal coating of copper tarnish and it doesn't affect the Q much or does it?
I was just wondering because with a gold plating I think it usually has a nickel plating under...
Yeah, its perpendicular.
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Yeah, I had already designed the brick work and it all worked out to so many pieces that the material and fab cost was really going up. It was then I started wondering if I could use sheets of something and laser cut a lot of gaps towards the...
I'm trying to gather information about what types of magnetic material are most economical for a large flat LC resonator, 18 inches by 18 inches by somewhere between 1 to 3 inches high. I need 18x18 flat sheets of magnetic material on top and bottom that route flux to a center magnetic material...
Later yesterday, after posting my questions, I came across what people are calling a "Lenz lens" which is utilized to concentrate flux. It uses a similar gap but they are usually flat or wire frame and not conduit shaped.
Also later yesterday I heard back from the patent's listed inventor. She...
I came across a patent for a thick wall copper tube with an electrical gap in its side so there won't be current flow. Does this type of design actually work for concentrating flux? Like this: https://patents.google.com/patent/US6720855B2/en
If this flux conduit doesn't work, how do people...
It is for driving ultrasonic piezo elements. The 2 same type transistors are connected in what looks like kind of a push pull configuration driving an output transformer at ultrasonic frequencies. The 2 transistors are the only active devices on the card. The output is also feed back to an...
I know what you mean but I don't see any TO-3 packages at the Diodes Inc website.
I was looking for much higher hfe transistors but wasn't finding much. I'm afraid to use a Darlington because I'm thinking the original transistor wasn't Darlingtion so if I install a Darlingtion I might get...
No problemo, sorry I took it the wrong way.
I think I just need to look for a cheap switching TO-3 NPN transistor , maybe 250V or higher with about 10A capability.
I'm going to try a BUX32B.
What's a good cheap switching low saturation NPN TO-3 transistor that can handle at least 250V 10A and have enough gain to insure oscillations start? Switching frequency about 50KHz.
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Switching frequency about 50KHz.
Does anyone know what is a Harris C9006 800637 TO-3 package used in an oscillator/driver circuit?
The circuit is not working and this part appears to have an internal short but I don't know what it is.
I tried to get support at the Intersil website to find more info but their website hangs up...
Thanks, I've seen 25 ohms used other places but a few places mention even lower and I can't find anything that defines why the cable impedance should be lower.
The class E output MOSFET can drive low impedances but the final output needs to match a 50 ohm antenna cable and antenna, so I'm...
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