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Posted By: alsetalokinHey, I could use a 2d21 if you've got an extra one. The GenRad Strobotach uses one and I'd like to have a spare.
Posted By: legendreNaturally, I'm with the gas thyratron crowd on this..
Posted By: AsterixBut 40KV at "several amps" would likely vaporize the innards of a 2D21.
Posted By: alsetalokinYep. That's a 1538A, a 150,000 rpm unit, very rare. Mine is a 1531AB which only goes to 40,000 rpm. I paid 600 for mine from Toronto Surplus about 6 years ago and probably got the special deal.
Posted By: Andrew PalfreymanJust a side note about higher order time derivatives, which are often attributed almost magical properties by the more whimsical. For a sinewave, these increase in magnitude for each higher order, the multiplicative coefficient being "omega" = 2*PI*frequency. So the Nth order time derivative is omega^N bigger than the fundamental.What am I missing? d/dx(d/dx(d/dx (d/dx(sin(x))))) = sin(x).
At the birth of the radio era, electrical sinewaves came into general use. Nothing unexpected was seen then, nor has been since, in respect of these Nth order terms. I expect nature has sinewaves of her own too, and they've been going much longer. Like sounds.
This post may be rubbish. YMMV
Posted By: tinkerI appreciate 40kV x 2A = Feck! I have no idea what Andrew expects to spend to get there. Or even if he plans to survive the first test.
Posted By: joshsWhat am I missing? d/dx(d/dx(d/dx (d/dx(sin(x))))) = sin(x).
Posted By: AngusI don't know where Andrew got his funny idea that the derivative of sin(x) or cos(x) yields magnitude gain along with 90 degrees phase shift.Posted By: joshsWhat am I missing? d/dx(d/dx(d/dx (d/dx(sin(x))))) = sin(x).
Missing nothing if you counted the "d"s correctly. And even if not, only missing a right angle.
Posted By: sonoboyWhat about a rotary spark gap or air / magnetic quenched? If you need better control it's easy to use a trigger electrode with a guided gap too.
Posted By: alsetalokinThe blood rushes out of my head when I even think of a 40 kV, 2 amp power supply.