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nixie supply SMPS to think about

Started by iccaros, January 07, 2012, 07:17:34 PM

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iccaros

January 07, 2012, 07:17:34 PM Last Edit: January 07, 2012, 07:19:29 PM by iccaros
I just bought one of these http://www.kosbo.com/index.php?option=com_content&view=article&id=107&Itemid=79
I plan to test it out in a build with submini tubes, but it claims 21ma out...
I have the schematic, I need to ask permission to post it but if I can I will,
for $20 I am willing to try...

Govmnt_Lacky

#1
January 07, 2012, 07:31:32 PM
Hey Steve!

Being a noob to HV tube projects, I would assume that the circuit would be great for a tube project... provided that your circuit runs around 15-17mA or so. I don't know how much current is required to run tubes at HV  :icon_redface: so that looks to be the only concern.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

iccaros

#2
January 07, 2012, 07:39:09 PM
Correct, I am thinking of using it for my battery powered tube amp but its small, if it works well it may be a good supply for a tube pedal. The worry is noise, as these are made for Nixie tubes not specific audio tubes.

defaced

#3
January 07, 2012, 07:40:58 PM
Good find!  How similar is this to some of the other SMPS supplies posted on here?

GL, current draw is about 1 ma per triode for a 12AX7.
-Mike

Govmnt_Lacky

#4
January 07, 2012, 07:43:01 PM
Quote from: iccaros on January 07, 2012, 07:39:09 PM
Correct, I am thinking of using it for my battery powered tube amp but its small, if it works well it may be a good supply for a tube pedal. The worry is noise, as these are made for Nixie tubes not specific audio tubes.

Touche sir!  ;) I anxiously await the findings (and the schematic if possible  ;D)

Quote from: defaced on January 07, 2012, 07:40:58 PM
GL, current draw is about 1 ma per triode for a 12AX7.

Thanks for the info my good man!
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

iccaros

#5
January 07, 2012, 08:00:47 PM
Quote from: defaced on January 07, 2012, 07:40:58 PM
Good find!  How similar is this to some of the other SMPS supplies posted on here?

GL, current draw is about 1 ma per triode for a 12AX7.
its using a MAX1771, and a 5 volt regulator. I does have a 1amp fuse and a voltage protection diode, so they did some planing, Its very similar to other designs posted here, but @ $20 I would buy one this small

Govmnt_Lacky

#6
January 07, 2012, 08:05:44 PM
Quote from: iccaros on January 07, 2012, 08:00:47 PM
its using a MAX1771, and a 5 volt regulator. I does have a 1amp fuse and a voltage protection diode, so they did some planing, Its very similar to other designs posted here, but @ $20 I would buy one this small

It has a 1A fuse?  ???

Is it off-board? I don't see a fuse on the board.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

iccaros

#7
January 07, 2012, 09:17:55 PM

Ice-9

#8
January 08, 2012, 06:14:36 AM
There £13 here in the UK, I may just buy one myself , shouldn't be too hard to get the voltage up to 250v ish and by replacing the 5V regulator with a 9V regulator and a suitable input PSU would give a 9v out as well.
www.stanleyfx.co.uk

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Please at least have 1 forum post before sending me a PM demanding something.

iccaros

#9
January 08, 2012, 02:55:32 PM
I was going to see if I could throw a diode and get 6.3 regulated out.. Tube heaters, but 12.6 would be good with a 14v supply.

Govmnt_Lacky

#10
January 08, 2012, 02:59:54 PM
Quote from: iccaros on January 08, 2012, 02:55:32 PM
I was going to see if I could throw a diode and get 6.3 regulated out.. Tube heaters, but 12.6 would be good with a 14v supply.

How critical is the extra 0.6V?

Couldn't you just use a 12V input and split it so one input goes directly to the tube heaters and the other goes to the nixie board?
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

iccaros

#11
January 08, 2012, 05:17:10 PM
the difference may not be critical, but I would be aiming for 6.3 instead of 5, the datasheet says 6.3 +/- 10% so 5.67 - 6.97 is the specification, I would have to experiment, but two diodes is the easy way to get the voltage desired, I hear there are 6.3 regulators but have never seen one, also 6.3 is what most of the Russian version of popular tubes want, not 12.6.

I could do that, but the Nixie board has it, so why not use it.. If its does not work out, I would remove the 5 volt regulator all together to remove an unneeded part. 

Govmnt_Lacky

#12
January 08, 2012, 05:54:38 PM
Quote from: iccaros on January 08, 2012, 05:17:10 PM
the difference may not be critical, but I would be aiming for 6.3 instead of 5, the datasheet says 6.3 +/- 10% so 5.67 - 6.97 is the specification, I would have to experiment, but two diodes is the easy way to get the voltage desired, I hear there are 6.3 regulators but have never seen one, also 6.3 is what most of the Russian version of popular tubes want, not 12.6.

I could do that, but the Nixie board has it, so why not use it.. If its does not work out, I would remove the 5 volt regulator all together to remove an unneeded part. 


I see BUT... shouldn't the tube heater(s) need a bit more push than 21mA?  :icon_eek:

I always thought the heaters drew quite a bit of current. Am I wrong here?
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

iccaros

#13
January 08, 2012, 06:20:57 PM
Regulated +5v +-1% at max 250mA (at 9v input) for your clock logic

so its not enough, with a heat sink you could get almost 1 amp, as that is the rating before heat sink, one tube need 300ma - 400 ma depending on type,
if not in a pedal with one tube I would just take it off to reduce some heat.

Govmnt_Lacky

#14
January 08, 2012, 06:24:09 PM
Regardless... if you use it like I mentioned above, it is still a VERY NICE source for 180V to the tube plates!  ;D

Any news on the schemo?
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

iccaros

#15
January 08, 2012, 11:24:33 PM
yep
I'll scan it and send it to you..

Ice-9

#16
January 09, 2012, 09:57:37 AM
I've already ordered one on ebay , but is there any chance i can get a look at the schematic in the meantime.  :icon_smile:
www.stanleyfx.co.uk

Sanity: doing the same thing over and over again and expecting the same result. Mick Taylor

Please at least have 1 forum post before sending me a PM demanding something.

tubegeek

#17
January 09, 2012, 01:21:52 PM
I wouldn't mind a look either - my Nixie clock has a transformer-based power supply and it takes up quite a bit of unnecessary room. It limits my choice of enclosures.

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gritz

#18
January 09, 2012, 01:59:15 PM
Neat! Any idea what frequency it's running at?

waltk

#19
January 09, 2012, 02:04:09 PM
QuoteI just bought one of these http://www.kosbo.com/index.php?option=com_content&view=article&id=107&Itemid=79

This looks about the same as the one that was discussed extensively in the giant thread about a tube boost running from a 9 volt battery (http://www.diystompboxes.com/smfforum/index.php?topic=63479.0).

The circuit is described well in this PDF: http://www.ledsales.com.au/kits/nixie_supply.pdf

I have a PCB layout for this if anyone is interested.  I've built a few, and usually use a 7812 or LM317 to power both this HV power supply and the tube heater.

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