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To: "CDV700CLUB" <[email protected]> Sent: Wednesday, April 6, 2022 9:28:41 PM Subject: Re: [CDV700CLUB] Question and an interesting site for those that modify CDV700s and more. Well I just

In my opinion, tempco is not the big deal here, knob control of shunt regulator on the HV side is a very big deal. Right now I do that function with Zener stack and switches at the bottom end, and

Roger, show schematic of sim? Geo To: "CDV700CLUB" <[email protected]> Sent: Wednesday, April 6, 2022 9:28:41 PM Subject: Re: [CDV700CLUB] Question and an interesting site for those that modify

Well I just simulated something I had not yet thought to do...... I simulated a Zener string. Yeah, yeah it worked...... ha! Largest Zener I could find in the model library was 36V so I strung enough

Well I just simulated something I had not yet thought to do...... I simulated a Zener string. Yeah, it worked...... ha! Largest Zener I could find in the model library was 36V so I strung enough of

Let me wait and see, I have some other things I would like to drive to completion. rogerw

Dear Geo, By the way, it sounds like paradise there! ~Cliff ***

or are you saying that you send something to me for testing? That's fine too. No problem. Geo To: "CDV700CLUB" <[email protected]> Sent: Wednesday, April 6, 2022 8:06:52 PM Subject: Re:

Dear Geo, That's what you get when a layman, whose mind is unfettered with relevant knowledge, comes up with an idea! Thanks. ~Cliff ***

Roger, a loaner can usually be arranged for a worthy project like this. Let's talk offlist [ mailto:GEOelectronics@... | GEOelectronics@... ] Geo To: "CDV700CLUB"

No. I am stone-age engineer and will first use a protoboard, then if I build it I will use a perfboard. That's enough for me, I am not manufacturing the things. However, I also do not have a HV supply

Roger, when this gets beta tested, can you do an eagle cad or some other 2 side pth PCB CAD for SMD?Geo

Peter, Minor change, I noticed after I posted the note below that I had not specified the second BJT in the Darlington. The enclosed schematic is corrected and now the simulation predicts about

Peter,Enclosed is a schematic of my suggestion below. That is an 8.2V Rohm Zener chosen for tempco to cancel the negative tempco of two Vbe's. It is slightly too positive in the result but quite "good

Ha Ha! I will put all that in my Write Only Memory (WOM) for posterity! rogerw

" ps - is Ne'er Dowell one of those Scottish clans in the Old World? :-)" Aye, the highlands! The neighbor here in MO raises red-haired Highlander cattle, reminds me 'o home... The only problem with

Peter, I realize that circuit described below might be "good enough," but realize that making that one BJT a Darlington pair is a significant improvement to the regulation. You can even get the

My all-time favorite is the Write-only Memory chip. rogerw ps - is Ne'er Dowell one of those Scottish clans in the Old World?? :-)

Good idea P. Make-before-break switches are rare, which is good. If used in "normal" circuits, they can be a disaster. Geo To: "CDV700CLUB" <[email protected]> Sent: Tuesday, April 5, 2022 9:33:27

Hi Roger, If you like low power semiconductors, resistors, capacitors, let me send you a drawer full of zero drain, zero drift, zero distortion, ultimately stable as a rock, transistors, diodes, and