[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

Mega props for this Paul... I've followed you trials and tribulations in hackaday and your posts here. I've learned a lot from what you've documented. I just want to say thanks and also that it's really appreciated. I wouldn't understand nearly what I do now if it hadn't been for your posts.

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

Interesting point Paul regarding turns ratio. The PA0367 is 1:12, and even though ringing on primary and secondary were small, it was causing havoc with devices methods for measuring primary voltage and secondary current. On Wednesday, May 8, 2019 at 7:45:04 AM UTC-4, Paul Andrews wrote: > > I

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

Good Point Greg. The LT3420 has Charge (CHG) pin which is essentially an enable/disable. If CHG=HIGH, device charges to set voltage. If CHG=HIGH and voltage is reached, device enters a refresh mode to regulate. CHG=LOW is low power mode. CHG can also be PWM'ed by micro to control input cur

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

I could've sworn I replied to this. Anyway, my design uses an LM3478 and an AO4294 - a combination I have used on many boards with different transformers - and fits on a 17mm diameter board. However driving an IN-18 at 155V/6mA the transformer gets very hot! This particular board doesn't do any

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

I did some tests with the PA0367 and LT3757 using the datasheet schematic (350V/flyback), regulation was ok but the efficiency was poor, 78% at 5ma/170V with 5V input voltage Am Mittwoch, 8. Mai 2019 02:18:49 UTC+2 schrieb Richard Arndt: > > I've made several PCB design attempts of a small USB 5

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

Welcome to the club..I've never had a switching supply work exactly as initially conceived. It always took several iterations. I did not spend much time going thru the datasheet because this device looks like it's meant for pulsed, rather than continuous, operation. That could have a large

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

Hi Greg. I took a look at the transformer you are using, but I opted for this one from the same family instead: *LPR6235-253LMRB*. It is 1:10 and has a much higher Isat than the one you are using. Amazingly it fit on the same footprint and it runs at a cool 100F at room temperature. Very happy.

Re: [neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

Hi David, PM sent... > On May 2, 2019, at 3:23 PM, David Forbes wrote: > > I could send you a bunch of the 31105 transformer that I use in my Nixie > watch with the LT1308B. > They are available from Wurth in large quantity, but no longer a stocked item. > >> On Thu, May 2, 2019, 11:54 AM gre

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

I meant to say "humiliating" -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

I've done a fair amount of work with flyback converters, or minor variants. The other circuit looks like some kind of self-oscillating topology, and I have not done anything with those other than build a Radio Shack kit with one back in the early 1970's. I really wish manufacturers would provid

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

W dniu czwartek, 2 maja 2019 20:54:25 UTC+2 użytkownik gregebert napisał: > > Sounds like your transformer is saturating; common problem with small > magnetics. > > I used an LPR6235-123 from Coilcraft in my wristwatch. They sell to > end-users in small quantities, which is nice. > Even though

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

FYI: This was the transformer I was using. The saturation current is 0.7A. On Thursday, May 2, 2019 at 2:54:25 PM UTC-4, gregebert wrote: > > Sounds like your transformer is saturating; common problem with small > magnetics. > > I used

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

One Idea whould be trying to use the LT8580, there is an appnote about using it as a VFD Tube supply. Sure, you would need a second dcdc to reach 9V, but those are super tiny nowadays. Could possibly fit on a 17mm board -- You received this message because you are subscribed to the Google Group

Re: [neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

I could send you a bunch of the 31105 transformer that I use in my Nixie watch with the LT1308B. They are available from Wurth in large quantity, but no longer a stocked item. On Thu, May 2, 2019, 11:54 AM gregebert wrote: > Sounds like your transformer is saturating; common problem with small >

[neonixie-l] Re: Suggestions for a LiPo powered nixie power supply design?

Sounds like your transformer is saturating; common problem with small magnetics. I used an LPR6235-123 from Coilcraft in my wristwatch. They sell to end-users in small quantities, which is nice. Even though it only ran for 7 seconds at a time, it still overheated at 7mA load but it's a possible