Comments on: Variations on Nixie Power Supply Design https://blog.theledart.com/blog/variations-on-nixie-power-supply-design/ Art and Technology are Friends Tue, 18 Aug 2020 10:01:26 +0000 hourly 1 http://wordpress.org/?v=3.9.1 By: David Brenner https://blog.theledart.com/blog/variations-on-nixie-power-supply-design/comment-page-1/#comment-113394 Fri, 14 Dec 2018 04:40:06 +0000 http://blog.theledart.com/blog/?p=2115#comment-113394 Thank you.

For opening the file you need Proteus 8.
Here is a screen capture of the test schematic: https://drive.google.com/open?id=1dpvToqal-dWDvKK9cVldF1_mBOGnHXHO

I will try to explain it a bit:
Bat2 + L2 + C6 are used as a few ms timer.
Rl1 simulates the real switch.
Bat1 is a 6 cell 1300mAh Ni-Mh battery.
R4 is the internal resistance of Bat1.
I use C5 because at startup the oscillator requires more power than usual.
R5 is the internal resistance of L1.
I use C7, C8, R9, R10 just in this schematic to collect data.
R8 discharges C2 at poweroff (without it the driver won’t start next time).
D2..D7 simulates a 6 x 6 2.7 V led matrice.

]]> By: The LED Artist https://blog.theledart.com/blog/variations-on-nixie-power-supply-design/comment-page-1/#comment-113371 Wed, 12 Dec 2018 15:04:34 +0000 http://blog.theledart.com/blog/?p=2115#comment-113371 Hello David,

I can’t open the schematics you posted. Can you provide PDF or image files?

]]> By: David Brenner https://blog.theledart.com/blog/variations-on-nixie-power-supply-design/comment-page-1/#comment-113370 Wed, 12 Dec 2018 14:24:26 +0000 http://blog.theledart.com/blog/?p=2115#comment-113370 Hi.
Very good schematic.
Thank you.

I am trying to switch a schematic to use MOSFETs instead of bipolar transistors.
This is the schematic (made in Proteus 8):
https://drive.google.com/open?id=1Ir1-AEk6AAYCymXuCfZjmHmMZFkeVnOq
It has 2 versions (one for 16 mA output and one for 32 mA).
The input voltage can vary from 4..5 to 8.4V (default is 7.2V).
I used pnps because I couldn’t find the spice model for the STN851 (found only for STN951).
But in the final version it will have npns and/or n-channels.
My question is: is it worth switching to MOSFETs in this schematic?
If yes, can you please give me a few ideas/tips?

Thank you again.

Best regards,
David

]]> By: The LED Artist https://blog.theledart.com/blog/variations-on-nixie-power-supply-design/comment-page-1/#comment-112352 Tue, 09 Oct 2018 18:05:06 +0000 http://blog.theledart.com/blog/?p=2115#comment-112352 I did try MPSA42 and many transistors alike. High (ish) voltage, small size BJT’s don’t do the job. I found KSP/MPSA06, which is only 80V, to work ok for low power situations. ZTX653 works remarkably well and has 100V Vce rating to help matters a bit.

]]> By: Johan Carlsson https://blog.theledart.com/blog/variations-on-nixie-power-supply-design/comment-page-1/#comment-112351 Tue, 09 Oct 2018 17:52:22 +0000 http://blog.theledart.com/blog/?p=2115#comment-112351 I’ve tried something similar with the MPSA42 instead of the ZTX653, but didn’t get my circuit to work. Are you familiar with the MPSA42? I might try to use it in your circuit while I wait for my ZTX653 order to arrive.

]]> By: The LED Artist https://blog.theledart.com/blog/variations-on-nixie-power-supply-design/comment-page-1/#comment-112350 Tue, 09 Oct 2018 16:48:34 +0000 http://blog.theledart.com/blog/?p=2115#comment-112350 ZTX653 version is pretty much the same as NSS1C201L circuit posted. I use them interchangeably depending on the package (SMD or through-hole).

]]> By: Johan Carlsson https://blog.theledart.com/blog/variations-on-nixie-power-supply-design/comment-page-1/#comment-112348 Tue, 09 Oct 2018 05:14:29 +0000 http://blog.theledart.com/blog/?p=2115#comment-112348 Nice work! Could you upload the schematic for the ZTX653 version of the circuit? I’m curious to see what component values you dialed in.

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