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Oh. Of course! rogerw

Geo, With UnRegHV = 1300V and dropping resistor = 1.8Meg, No load, 910.00V Rload = 1G, 909.99V Rload = 100Meg, 909.86V, Rload = 10Meg, 909.01V. If one were to measure on the other side of the 3.3Meg

Roger and Geo: tried a simple series regulator R6 is a dummy load of 100M( manually swept it down to 10k and seems to work) Q2 is a cheapo 2n3904 and so are Q1 and Q3 choice of Q2 depends on how much

good question. I will hazard a MindSim answer, then will do the simulation. As long? as the loading of the Zener String regulated node does not approach to close to the current flowing into the

Peter (or Al? Hello AL, I don't think I've met you before) can you simulate that 900V, Zener, 1G resistor thing? It's important. Geo To: "CDV700CLUB" <[email protected]> Sent: Thursday, April 7,

what is safe? Where the green photograph is taken is normally viewed by human operator's bare eyes. Everything X-Ray service tech does is safe, or he doesn't do it. G To: "CDV700CLUB"

1) Yes, PiN with an intrinsic layer is essentially "very very very lightly doped" and therefore HV. I should have thought of that, mind is getting rusty... thanks for bringing that up. PiN is also

I don't know, never saw that listed either. Meantime do this simple sim for me. +1300V DC to cathode of a Zener ( can be via 1.8M Ohm res. or direct in this case only). Any Zener. On the other side of

Roger et al: Some hv diodes are PiN, there is an intrinsic band. Supposedly the IN4007 is one of the commonly available diodes which some people claimed had an "i" layer. Used them as low cost RF PiN

I guess it is safe? wow! rogerw

Geo, Ok, I got a bit curious...... If a Zener String of 900+V can change +/-40V over -25degC to +75degC, what did the original Corotrons do? IE, a Victoreen GV3A Corotron? It turns out that this Vic

The photograph is of a model 07-451 X-Ray waveform detector. Every X-Ray Service Tech in Scotland carries on in his service case. You attach it via coax cable to an oscilloscope and turn on the X-Ray

1) yes, could be multiple junctions. 2) You have an exray machine? 3) We used to "de-pot" plastic packaged IC chips with acid to expose the die in the package, to examine under a microscope,

I've always assumed the multiple junction idea, because in practice the higher voltage rectifier diodes get longer and longer. Ones for a 100kV stack are a good 6 inches long each. Don't know, just

Well, the answer to your first question is: I am not sure, but I think it is probably just very lightly doped silicon pn junction. The light doping (and perhaps playing around with the doping profile

Question Roger, are HV (like 8kV) low current diodes a stack of normal PN junctions inside or are they a single special PN junction? What I do measure is higher and higher Fwd V drop as the V (sub)

I see that addition, yes that needs to be built when the modelling is finished, and I intend to build a breadboard model to examine what does a TL431 do if added to the bottom of the Zener stack. It

Geo, My thoughts which did not make it into the previous note: 1) The largest Zener in my library appropriate to use was 36V. In fact I have used 100V, 200V, 300V, and 330V Zeners. (These last two are

Geo, Sure, enclosed, but I have already modified the Zener String with a temperature compensation scheme that will be somewhat familiar to the discerning eye. I am NOT suggesting this circuit for a

Pic of the Si-3BG version, and the now standard arrangement. The bottom clip has been moved down all the way to the base, the 900 to 400V converter is simplified, miniaturized, and installed inside