Hello and thank you for your speedy response, that all sounds perfect then. Please keep me posted on developments, I shall follow this thread.
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Kind regards
Richard
Sent from my Huawei phone
-------- Original Message --------
Subject: Re: [neonixie-l] Re: Homebrew high voltage nixie power supply
From: "Kevin A."
To: neonixie-l
CC:
--Hi Richard,Thanks for the interest. Yes, there is a logic controlled enable/disable which can switch the high voltage output on and off. In normal operation, there is an internal pull-down on this pin in the controller IC to keep the output on. If this pin is pulled above 1.2 volts, it will signal the controller to turn the output off. The maximum voltage permitted on this pin is 10 volts. I will include a terminal block for easy access to this feature.The difference between 170 and 180 volts should not require an additional resistor on R31. Looking at the smartsocket cathode resistor values for each segment, they are the same as those used in the mod-six 7971 clock, which operates without issue with 180 volts at the anode. The ~6% increase in power dissipated between 170v and 180v is minor and will not noticeably affect the longevity of the tubes or driving electronics.I've never sent a package overseas, but I could certainly try! Hopefully customs doesn't panick at the sight of mysterious circuit boards.Thank you,KevinOn Sun, Sep 8, 2019, 11:43 PM Richard Scales <rich...@scalesweb.co.uk> wrote:Please could you add me to the list of interested parties. I have some projects based on B-7971 and ZM1350 and would really appreciate it if i could use power supplies that were within spec for what I want to do.--These projects include 6, 8 and 10 tube variations.Please could you confirm whether or not you include a logic driven enable/disable (I did see EN1 on the picture of the PCB on your project site). Also, am I right in thinking that to drive smart-sockets from 180V as opposed to 170V there needs to be a change in the value of the common anode resistor R31 (from a link to some resistance that deals with the slight increase in supply voltage)?I am in the UK - I hope that isn't a show stopper!Kind regardsRichard
On Sunday, 18 August 2019 06:18:20 UTC+1, Kevin A. wrote:Just wanted to share a nixie related project I've been working on for a few weeks now. I've got the boards ordered for my latest revision. Looking for any feedback and to see if this interests anyone.https://neonkev.com/2019/08/18/project-20-watt-high-voltage-boost-converter/Since I got into nixies, I've found that good high voltage power supplies are a major asset to any successful design. Instead of relying on Chinese eBay stuff or other unsustainable sources, I wanted to build my own using the latest in boost controllers and high power semiconductors in addition to using the highest quality, brand name components in the actual construction the supply. It's not a design built down to the lowest cost but one built for silent, reliable, and continuous low-ripple operation at rated power.This will be made open source once I've matured it to a reasonable degree. I hope that the latest revision will prove satisfactory.
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