PSU Voltage Surges

Gosh, that's horrible.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

"john larkin" snipped-for-privacy@glen--canyon.com wrote in message news: snipped-for-privacy@4ax.com...

It's a lot better than many circuit diagrams/schematics I had to deal with 50 years ago when I was learning about what happens if you touch the top cap of the line output/flyback valve/tube.

I could probably clean it up for you but don't have time.

Or did you mean the concept is horrible?

I did clean up Bill's circuit but never posted it because by then we were way lower that 60dB with less than a third of the components.

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InstName C23 SYMATTR Value 100n SYMBOL cap 832 -2144 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C15 SYMATTR Value 100n SYMBOL cap 880 -704 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C16 SYMATTR Value 100n SYMBOL FerriteBead 2208 -2208 R0 SYMATTR InstName L1 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap 2288 -2144 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C7 SYMATTR Value 100n SYMBOL OpAmps\\LT1679 -624 -1472 R0 SYMATTR InstName U3 SYMBOL OpAmps\\LT1679 -176 -1520 R0 SYMATTR InstName U8 TEXT -1752 -488 Left 2 !.MODEL BAS70L D IS = 3.22E-9 N = 1.018 BV = 77 IBV = 1.67E-7 RS = 20.89 CJO = 1.608E-12 VJ = 0.3891 M =

It might look that way until you think about it. Relay contacts don't move anything like as fast as electrons in free space. As the contacts move together they will eventually get to a spacing which a high voltage can spark over. You get a glow discharge for a microsecond or so until the surfaces start to heat up under ion bombardment and start distorting into the spikes which can deliver enough current to sustain an arc.

You can get microwelding when the relay finally closes. Relay life may not be all that great.

Even downloading books costs money and time. Your recommendation merely tells us merely that you like it - and you like Donald Trump.

What have you found wrong with it?

We are all grateful that you don't actually design electronics.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

Reading books is really hard too.

What in the world about this thread invoked Trump? We were talking about tube power supply transients.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

Electronic circuit design is an art, and you aren't a master of it.

The point I made about relay contacts strikes me a sensible. Mercury wetted relays would be less vulnerable to that kind of damage - the mercury surface can't microweld - but it is a point that a competent circuit designer would keep in mind. You seem to fall into the barely competent category.

Not if you reading rate is unusually fast, and mine is.

It's a measure of your susceptibility to confidence tricksters.

I note that you have snipped the link I posted to the actual book

That makes you a text-chopper. You aren't a particularly attractive character.

John, you can be such a *bitch* at times! :-D

He doesn't need to as he's already one. In his own mind, anyway. ;-)

In different book ("You are joking mister Feynman") Feynman wrote that as a kid he earend money repairing radio receivers. One receiver was making horrible noise after turn on, but worked OK after it was warm. This was two tube design with both tubes of the same type. Feynman conjectured that one of tubes was heating faster and was responsible for the noise. He swapped the tubes and this solved the problem.

Voltage divider setting output voltage is connected in wrong way. On the picture trimpot T1 is connected to 0V line, but it must be connected to slightly higher voltage.

Minor glitch is that left to milliamp meter line is marked with

-580V, on the right with -350V. I do not think that millamp meter is dropping 230V.

He does try to be. He'd need to have more credibility to be any good at it.

I suspect it should be shown connected to the +10v reference supply. Next time I take the instrument apart, I'll check that and correct the drawing.

Tracing circuits like this where there are lots of floating voltage supplies referred to different places can be quite difficult. There are components scattered all over the metalwork, with wiring looms connecting them to the main printed circuit board, it is easy to forget which wire is which.

Yes, I must have measured that voltage with respect to the +ve line from the rectifier or under some different conditions. Another correction to make. Thanks for spotting those mistakes.

That's more clear thinking than electronic expertise.

It would be hard to for me to see myself as any kind of genius, when I've got three patents and my father and a couple of my friends clocked up about 25 each. Alan Dower Blumlein had 128 when he died at age 48 years of age. I'm pretty good at what I do, but I've known people who were better at it.

You aren't in the hunt, and I've got reservations about John Larkin's expertise.

Of course patents aren't any kind of measure of genius - Richard Feynman claimed that he had three, but nobody has ever been able find them. Albert Einstein did better, but in both cases their reputation depends on their published scientific papers, not their patents.

And Mozart had neither.

I did get a few pages in The Art of Electronics AOE3, and I'm named 22 times in the X chapters, and I'm in the dedications, and in the index.

I admit that I have no patents related to stirred water baths. I do have a few customers.

Most ordinary relays will make bad "dry" contacts, namely do bad low-level switching, without enough voltage and current to spark the contacts a bit and blast through oxide.

Does anybody here use mercury or mercury-wetted relays? They are big, expensive, toxic, and unreliable.

Digikey has one mercury tilt sensor for $203 plus $35 shipping.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

Sure.

I'm friendly and cheerful and helpful to decent people, but don't much like creeps.

Sorry.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics