Need schematic for a 100 megawatt audio amplifier

Started by Anonymous in sci.electronics.design2 hours ago 43 replies

Need schematic for a 100 megawatt audio amplifier using vacuum tubes.

Need schematic for a 100 megawatt audio amplifier using vacuum tubes.


IEEE Magnetics Society uses lawyers to prevent scientific communications.

Started by Alan Folmsbee in sci.electronics.design2 hours ago 6 replies

I wrote a breakthrough paper on the ferromagnetic element iron. You can get an unpublished copy of it by emailing me. "Iron has two rings of...

I wrote a breakthrough paper on the ferromagnetic element iron. You can get an unpublished copy of it by emailing me. "Iron has two rings of protons" by Alan Folmsbee MSEE I am a former IEEE member and I published conference papers at ISSCC and IEDM. I was on a panel at ISSCC, the International Solid State Circuits Conference. I have 16 patents assigned to Intel, AMD, and Sun Microsyst...


fiddled filter design

Started by John Larkin in sci.electronics.design2 hours ago 111 replies

We were just talking about the classic lowpass filter forms (Chebyshev and such) and their history, being used to optimize the creation...

We were just talking about the classic lowpass filter forms (Chebyshev and such) and their history, being used to optimize the creation of log tables and such. The classic functions map beautifully into electronics, but there's no reason that an electronic filter has to follow any of those forms; it only needs to work. Hence fiddled filters, parts values just diddled until the filter i...


Toaster oven for reflow

Started by Peabody in sci.electronics.design3 hours ago 3 replies

I'd like to be able to do reflow on a very occasional basis, but real reflow ovens appear to be either no good or very expensive, and...

I'd like to be able to do reflow on a very occasional basis, but real reflow ovens appear to be either no good or very expensive, and Arduino-controlled toaster oven projects seem to be very elaborate, with hours of work and a good bit of money involved. But recently I found this: https://www.youtube.com/watch?v=mjfnpjvw9jY Basically, he leaves the toaster oven alone, and manually con...


ESR Meter confusion

Started by Anonymous in sci.electronics.design3 hours ago 84 replies

One of my digital multimeters has a capacitor test built into it. But I dont believe that tests the ESR. I've recently read many articles...

One of my digital multimeters has a capacitor test built into it. But I dont believe that tests the ESR. I've recently read many articles and watched videos about testing the ESR of caps. I wanted to buy an inexpensive ESR tester and went to ebay. I am just a hobbyist on a low fixed income so I cant pay a lot. Anyhow, that is where I got real confused. Several say ESR, while others are ju...


Common collector Colpitts oscillator frequency formula

Started by Anonymous in sci.electronics.design3 hours ago 51 replies

Could some electronics guru please help ? I am trying to find the frequency of oscillation for a common collector Colpitts oscillator ? For...

Could some electronics guru please help ? I am trying to find the frequency of oscillation for a common collector Colpitts oscillator ? For a common emitter Colpitts oscillator, the frequency of oscillation is focs = 1/(2*PI*sqrt(L*Ct)) where Ct is the equivalent capacitance of the two series capacitors. The resonator is used as PI circuit, with a series inductor and 2 shunt capacitors...


fast(ish) one-shot

Started by George Herold in sci.electronics.design3 hours ago 13 replies

So I'm making a one shot out of two 74HC14, the first gives a nice sharp edge to drive the cap. (~47pF) into the second. (which has R and diode...

So I'm making a one shot out of two 74HC14, the first gives a nice sharp edge to drive the cap. (~47pF) into the second. (which has R and diode to positive rail. I think R_min is 500 ohm. Well, that's more delay than I thought it was, (eating crow.. "mmm good crow") I've got a faster comparator to try on the front end, maybe I should do that first.? George H.


PCB Layout - power conversion

Started by Yzordderrex in sci.electronics.design4 hours ago 6 replies

Greetings to my beloved team. Over the years I have relied on your help in my day to day engineering adventures. I thank you immensely for...

Greetings to my beloved team. Over the years I have relied on your help in my day to day engineering adventures. I thank you immensely for that. I have been fortunate to have a sounding board such as this place to help with my efforts. Often times I would say to my boss, "let me go ask my team, or let me put my best guys on it." He had no idea who or what I was talking about :)


Was Tesla a Quack?

Started by Yzordderrex in sci.electronics.design4 hours ago 41 replies

Were Tesla's ideas practical?

Were Tesla's ideas practical?


OT: Ping JL

Started by Cursitor Doom in sci.electronics.design4 hours ago 9 replies

I hope your business isn't located here.... https://www.zerohedge.com/news/2018-11-09/want-free-100k-quit-your-job- move-here -- This...

I hope your business isn't located here.... https://www.zerohedge.com/news/2018-11-09/want-free-100k-quit-your-job- move-here -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this...


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