Re: [neonixie-l] Re: V400 carnage

[David Forbes]

Unfortunately, I have no photos of the circuit board repairs.

On 4/4/16 1:14 PM, Ciaran Wills wrote:

Were you able to fix it?  I have a V400 that appears to have suffered the
same fate, and I'd really like to get it running again.

On Saturday, April 19, 2014 at 3:05:50 PM UTC-7, nixiebunny wrote:


This clock had a hard life. The PC board was baked from the transistor
overheating. There was also a carbonized spot to the left of the
transistor, where the far end of the rectifier diode pad was placed very
close to the transistor, with a ground plane in there too! 0.5mm spacing
between traces with 200VAC on them. I don't know which was the chicken and
which the egg.







--
David Forbes, Tucson AZ

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Re: [neonixie-l] Re: V400 carnage

[gregebert]

Here's a handy online tool for determining PCB-trace separation:  
http://www.smps.us/pcbtracespacing.html
There are 3 spacings noted (external, internal, and coated). I would 
recommend using 'external' wherever possible because it's the most 
conservative. Unseen flaws in PCB manufacturing happen, so using 
absolute-minimum spacing with high-voltage traces is a gamble.

The website mentions UL experiments that found PCB's can tolerate 40 
volts/mil. One mm is about 40mils.
I dont advise pushing PCB designs anywhere near that value, though.

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Re: [neonixie-l] Re: V400 carnage

[David Forbes]

I did fix this clock. I carved away the carbonized PC board and built a better 
heat sink arrangement for the TO-220 transistor, and I reattached the burned 
traces with wires. I made wider clearance between the HV power paths too.


I may have some photos of the repair job at home; I will look tonight.


On 4/4/2016 1:14 PM, Ciaran Wills wrote:

Were you able to fix it?  I have a V400 that appears to have suffered the same
fate, and I'd really like to get it running again.

On Saturday, April 19, 2014 at 3:05:50 PM UTC-7, nixiebunny wrote:

This clock had a hard life. The PC board was baked from the transistor
overheating. There was also a carbonized spot to the left of the transistor,
where the far end of the rectifier diode pad was placed very close to the
transistor, with a ground plane in there too! 0.5mm spacing between traces
with 200VAC on them. I don't know which was the chicken and which the egg.

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--
David Forbes, Tucson, AZ

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Re: [neonixie-l] Looky what I found !

[robin bussell]

On 01/04/2016 18:06, 'threeneurons' via neonixie-l wrote:

[neonixie-l] Re: My Project: Nixie Tube Kitchen Timer

['Dave' via neonixie-l]

*This is very creative and nicely executed.I too would like to see the 
KiCAD files if possible.*



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[neonixie-l] My Project: Nixie Tube Kitchen Timer

[Mitch]

Looks great!  Will you release the KiCad or Gerber files?

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