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Video link : https://youtu.be/D73ftDxfoq4 Geo

For proof-of-concept the project was started with tried-and-true circuits that we have used before, but these were installed into either the CDV-700 body or in a Pikes Peak Prospector housing along

This little project led to a plug in adaptor that fits the 3 Pin 6993 socket on one end and has a clip on the other end to accept a Russian tube. The wiring board first adapts the normal CDV-700 HV

1) Yes. Unfortunately, delta-Vbe also has a positive temperature coefficient, and this is present as an error voltage between Q1 and Q2 due to non-matching bias currents depending on (UnRegHV-

Roger: 1) Something to check if stability isn't good enough. I guess I can glue the transistors together if necessary too. 2) well higher and lower voltage zeners from 5.1~5.6V have temperature

OK. My only other suggestion is increasing the zener voltage, such that the reference voltage becomes larger compared to circuit errors. Then, when the [744K trimmer] resistor between Q2 and ground

Wow, good info. Thanks. -Chris ________________________________ Sent: Thursday, March 31, 2022 7:08 AM To: [email protected] <[email protected]> Subject: Re: [CDV700CLUB] Question and an

Chris section 9 of the proposal has a fixed price of $630,000 for the final release survey (8 week effort) bid shows the decontamination will be done in parallel with final release survey ::

Thanks for checking in MikeL. Geo To: "CDV700CLUB" <[email protected]> Sent: Thursday, March 31, 2022 5:49:17 AM Subject: Re: [CDV700CLUB] Fun Identify the Probe QUIZ Clue 1 [Edited Message

I knew this one, but M.K.? beat me to it. Mike L.

Cool Peter, thanks for that update. Been there, done that many times, just another part of the experimenting process, called "the smoke test". Geo To: "CDV700CLUB" <[email protected]> Sent:

Roger: Yup increasing the dropper resistor from 1M to 2.2 or 3.3M would improve the shunt regulator's performance, but some of my scintillator probes have low impedance resistor divider networks ~

good deal! All is well! btw you might consider increasing that 1M "dropper resistor" to 2M or 3M, I think regulation may improve as it is increased. rogerw -- rogerw On the Catclaw ΜΟΛΩΝ ΛΑΒΕ

Roger et al: The weird voltage dropping trend as Vcc was raised well past the shunting knee point was my fault. Yesterday, while tinkering I accidentally connected the resistor that is connected to

I ought to take back the second sentence of my reply below: "If it does not ask for that breakdown voltage parameter, it is not there." You could be using a specific model from a model library in

Only if the MosFet model being used incorporates that feature. If it does not ask for that breakdown voltage parameter, it is not there. However you can add a discrete diode to the simulation and

Good guess M.K., right out of the box!Here's the final Clue picture to show the unfamiliar the proportions of a '719At the bottom of the photo notice the socket end of the CDV-700 probe housing, while

of course, you don't mention the length, so if it's short, then 6993(again, different companies have different #'s for this too)

LND 719 perhaps(other companies have the same tube with different #'s though). Looks like a extra long 6993 wrote: