[neonixie-l] Re: low power nixie tubes?
On Monday, 26 November 2012 19:59:12 UTC, bryan wrote: > > Just curious to see if anyone from this group knows if there are any low > power nixie tubes like IV-9 Numitron tubes that only needs 1V-12V? Not more > than 100V? > > Hi - IV-9s are not nixies - they are numitrons which have incandescent filaments like old light bulbs - a completely different technology. They operate off 4.5V taking about 19mA per segment. The technology in nixies requires the gas in the tube to ionise to get that orange glow round the shaped cathodes - there are basic constraints laid down by laws of physics that determine the energy required to do this, thus the voltage that is required to start ionisation. The voltage at which ionisation starts (the striking voltage) is typically around 160 to 180VDC; once struck, they maintain at a lower voltage (e.g. 120VDC) - the striking voltage for a given tube is determined by physical factors such as gas mix in the tube, pressure, presence of ionising radiation etc. All nixies work this way which is why we use step-up (boost) converters to change low voltages up to typically around 180VDC. Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/U5j14Pcp5CUJ. For more options, visit https://groups.google.com/groups/opt_out.
[neonixie-l] Help needed to design Swithmode step-up converter, this time not so Nixie-related
Hi folks. Usually i build and tinker with Nixie tubes, so a Step-up converter is nothing new to me. I usually use the MC34063A-based MK1,5 supply design from M. Moorrees which works wonders! Now i got a job set for me - I need to retrofit a head-mounted lamp with LED's - I got a whole bunch of 5050-style warm white LED's from some scrapped lamps (the original smps power supppled blew up) so i got a good supply of these LED's. There is 3 dies inside each LED package, and i reckon they can handle about 40 mA without any active cooling. On the original boards, these LED's are mounted in 5 chains of 6 LED's each - no resistors mounted, i guess the power supply was current limited. I milled a new PCB with room for 20 of these LED's - put them all in series, so i have a load that likes around 70V and 40 mA. I milled a pcb with a MK1,5 Power supply, replaced the voltage divider with a 33 ohm resistor for the low side, so the power supply is current-regulated, and it works just fine. The problem I am having, is the heat loss from the Mosfet and inductor - Packing this inside the bulb renders these parts at 100 degrees C, which i don't think they will last very long being that temperature... I am using a 2SK3592 switching transistor and a 10 uH low loss SMT inductor. I replaced the SMPS IC with a NCP3064B which is just a descendant of the venerable MC34063A chip, so that won't change anything really. Now, the question is, any advice on getting the efficiency bumped up a bit, and would i be better off rearranging the LED's so i have a lower voltage and higher current ? I could parallel all the LED's, but that is a big no-no as I am concerned. Any tips or advice would be welcomed ;-) // Per. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[neonixie-l] Re: IN-9's for sale
What is price to sell per lot? and what is shipping cost? On Monday, November 26, 2012 12:41:16 PM UTC-6, Dan Foster wrote: > > Hello, > I have a few (10) IN-9 Bargraph tubes that I no longer want, thought I'd > ask here before I list them on eBay. Anyone interested? -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/G7DPsnMVC4MJ. For more options, visit https://groups.google.com/groups/opt_out.
[neonixie-l] low power nixie tubes?
Just curious to see if anyone from this group knows if there are any low power nixie tubes like IV-9 Numitron tubes that only needs 1V-12V? Not more than 100V? Thanks -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/QtPqs1TdHvAJ. For more options, visit https://groups.google.com/groups/opt_out.
[neonixie-l] IN-9's for sale
Hello, I have a few (10) IN-9 Bargraph tubes that I no longer want, thought I'd ask here before I list them on eBay. Anyone interested? -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/e7bgXokvZbsJ. For more options, visit https://groups.google.com/groups/opt_out.
Re: [neonixie-l] Re: 5BP1 CRT
> But, I did make a little tube checker, to at least, light them up, and do > rough deflection tests. > > http://threeneurons.files.wordpress.com/2012/09/crt_tst01.jpg That's cute - do you have a schematic for it? I'm guessing it's a variant of your 34063-based nixie supply with a voltage multiplier and resistive divider. - John -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
