Re: [neonixie-l] SP-101 Clock, finshed at last!

[Richard Scales]

Mostly good news then. Will you be pursuing a replacement for the failed part? RichardSent from my Huawei phone Original message From: Nicholas Stock Date: Fri, 11 Dec 2020, 04:45To: 'Greg P' via neonixie-l Subject: Re: [neonixie-l] SP-101 Clock, finshed at last!Reporting back on the eBay listing. I received the displays today...hard to tell whether they're used or not, they fire on all segments OK and there's none of that 'used' look to the segments that you typically see in well worn panaplex displays. However, they're a bit dirty and the pins are not clean (storage issue?). The backplane isn't completely black either, but a little greyish. Anyway, they were packaged well and only one was dead from the lot I purchased. However, the price the seller is asking is a little steep.IMHO.NickOn Mon, Dec 7, 2020 at 12:16 PM Nicholas Stock  wrote:That was me! :) Yep, I bought some at $18 (made an offer). I was also dismayed that the seller hiked the price afterwards, no idea whymaybe they think they're a hot commodity. I haven't received mine yet, but when I do I'll report back on condition/operation.Cheers,NickOn Mon, Dec 7, 2020 at 6:06 AM Richard Scales  wrote:Hello, - I did not see that myself but I know someone who purchased @ $18, he sent me the link to the sale which then showed $35 - disappointing :-(- RichardOn Monday, 7 December 2020 at 13:59:02 UTC philthepill wrote:

 
 
 
  did you notice that he hiked the price from $18 ( each for first 20 sold )  to $35 now 
  Pharma Phil
  
   -- Original Message --
   From: Richard Scales 
   Date: December 7, 2020 at 3:23 AM
   
   Anyone looking for SP-101's could try here:
   

   
   
#S2T5 Beckman SP-101 Gas Discharge 1 Digit 7-segment Display 
   
   

   
   
Not my auction etc.etc.
   
   
   


   
   

 On Tuesday, 1 December 2020 at 21:49:34 UTC newxito wrote:
 


 
  I already have the domain and the web space but I will have a look at blogger, thanks Terry.
 
 
  I've already learned something today. A friend told me that even for a private website I absolutely need a privacy policy and it is better to have also a "legal notice"... that's annoying!
  
  
 

   
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[neonixie-l] Re: Bad batch of Burroughs 6844A nixies

[gregebert]

I have not been able to figure that out for years. You would think the 
internal leads were coated with an insulator so they dont glow, or perhaps 
they use a different metal with a higher workfunction than the actual 
cathodes, so they would not glow in normal circumstances. But when the 
cathodes are still visible, I dont understand why they have no glow. I 
doubt they would be selectively plated with another metal, which completely 
sputtered away, leaving them unable to glow.

I have a bag of dead nixies, mostly 5031/6844,  took 2 out, and microwaved 
them for 2 seconds. Got a brilliant crimson glow. One of them shows some 
cathodes working, so now I have to go back thru the bag to make sure I find 
the totally dead ones, or at least the ones that have glowing only on the 
bondwires, and nuke them in the microwave oven. I have other boxes for 
dying nixies, and so-so nixies, so I'm really surprised anything in the 
"body-bag" of dead ones actually glowed. Unless perhaps the zap from the 
microwave oven did something to the internal metal.

I have some more experimenting to do.

On Thursday, December 10, 2020 at 4:57:40 PM UTC-8 Chuck wrote:

> Burroughs 6844A is domed not flat.   I also have some National Electronics 
> NL-6844A tubes.  Frankly, I have had much better
>
> luck with the National Electronics brand.   This recently purchased batch 
> of (8) Burroughs 6844A tubes is a bad batch.
>
> The boxes all are stamped MAR 4 1968.  The tubes themselves are date-coded 
> 6750 F20.  In white letters stenciled on the glass:
>
> "Burroughs 6844A NIXIE".
>
>  
>
> The test I did was that the anode got connected to +170 volts DC through a 
> 15k resistor.   Then the digit cathodes were selectively
>
> grounded to the negative side of that power supply.On all (8) of these 
> Burroughs tubes, most of what is seen is an intense glow concentrated
>
> around the tiny internal wires which connect the digit cathodes of the 
> stack, to the pins.   These tiny wires pass closely to the outside of the
>
> Anode casing which surrounds the digit stack.   The glow strikes in the 
> wrong place.   The glow is around the lead wires instead of being
>
> around the digits.I am very confident from the way these tubes were in 
> those boxes, that only one of the batch had even ever been out of the box.
>
>  
>
> So I am curious what causes the glowing lead wires.
>
>  
>
> Chuck
>

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Re: [neonixie-l] Surplus panaplex displays

[Nick Andrews]

I might be interested in the SP-736 and 735 units.

On Thu, Dec 10, 2020 at 6:36 PM Bill van Dijk 
wrote:

> As an ongoing part of my effort to rationalize my parts inventory with the
> likelihood of becoming an actual project, I have a bunch of Panaplex
> displays up for grabs. Here is the list:
>
>
>
> From left to right:
>
> Babcock SP-101 (large single digit) 60 units, used
>
> Babcock SP-352 (smaller dual digit) 28 units, used
>
> Sperry SP-736 (small 2 digit) 6 units, NOS
>
> Sperry SP-735 (+, -, 1, and a single digit) 12 units, NOS
>
> Sperry SP-333 (three small digits) 1 unit, NOS
>
>
>
> The used units have some glue on the glass where there was a strip of
> paper glued on to hide the bottom part of the display. Any units that had
> any visible signs of silvering on the glass have already been discarded. I
> have not tested any of them. I would like to sell them all as one lot.
>
>
>
> I have no idea what a fair price would be, so anyone who is interested
> please send me a PM with your offer. I will wait until Dec. 15 to decide.
> Please note you bid is for the parts described, shipping will be extra, to
> be determined when I know the destination (at cost).
>
>
>
> Give yourself a Christmas present! J
>
>
>
> Thanks, Bill van Dijk
>
>
>
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> "neonixie-l" group.
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> 
> .
>

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Re: [neonixie-l] Surplus panaplex displays

[Organs Grinder]

Also interested in SP-101's. 6-8 pieces as well.

Cheers

On Fri, Dec 11, 2020 at 2:15 PM Richard Scales 
wrote:

> Also interested in SP-101..
>
>  - Richard
>
>
> On Friday, 11 December 2020 at 01:09:15 UTC M1 wrote:
>
>> I wouldn’t mind getting SP-101 units.  I would like to get them in
>> quantities of 8, but would rather get all 60 units.   Please let me know
>> how much you would take.
>>
>>
>>
>> Someone was selling the SP-352 new for $10 each.  I bought 48 of those
>> from him.  I can only guess the price would be around that since the units
>> you have are bigger although only single Digit.  Again, I have no idea.
>>
>>
>>
>> Michail Wilson
>>
>> 206-920-6312 <(206)%20920-6312>
>>
>>
>>
>> *From:* neoni...@googlegroups.com  *On Behalf
>> Of *Bill van Dijk
>> *Sent:* Thursday, December 10, 2020 4:37 PM
>> *To:* neoni...@googlegroups.com
>> *Subject:* [neonixie-l] Surplus panaplex displays
>>
>>
>>
>> As an ongoing part of my effort to rationalize my parts inventory with
>> the likelihood of becoming an actual project, I have a bunch of Panaplex
>> displays up for grabs. Here is the list:
>>
>>
>>
>> From left to right:
>>
>> Babcock SP-101 (large single digit) 60 units, used
>>
>> Babcock SP-352 (smaller dual digit) 28 units, used
>>
>> Sperry SP-736 (small 2 digit) 6 units, NOS
>>
>> Sperry SP-735 (+, -, 1, and a single digit) 12 units, NOS
>>
>> Sperry SP-333 (three small digits) 1 unit, NOS
>>
>>
>>
>> The used units have some glue on the glass where there was a strip of
>> paper glued on to hide the bottom part of the display. Any units that had
>> any visible signs of silvering on the glass have already been discarded. I
>> have not tested any of them. I would like to sell them all as one lot.
>>
>>
>>
>> I have no idea what a fair price would be, so anyone who is interested
>> please send me a PM with your offer. I will wait until Dec. 15 to decide.
>> Please note you bid is for the parts described, shipping will be extra, to
>> be determined when I know the destination (at cost).
>>
>>
>>
>> Give yourself a Christmas present! J
>>
>>
>>
>> Thanks, Bill van Dijk
>>
>>
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "neonixie-l" group.
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>> email to neonixie-l+...@googlegroups.com.
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>> https://groups.google.com/d/msgid/neonixie-l/016401d6cf55%24b50e4770%241f2ad650%24%40gmail.com
>> 
>> .
>>
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> .
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Re: [neonixie-l] SP-101 Clock, finshed at last!

[Nicholas Stock]

Reporting back on the eBay listing. I received the displays today...hard to
tell whether they're used or not, they fire on all segments OK and there's
none of that 'used' look to the segments that you typically see in well
worn panaplex displays. However, they're a bit dirty and the pins are not
clean (storage issue?). The backplane isn't completely black either, but a
little greyish. Anyway, they were packaged well and only one was dead from
the lot I purchased. However, the price the seller is asking is a little
steep.IMHO.

Nick

On Mon, Dec 7, 2020 at 12:16 PM Nicholas Stock  wrote:

> That was me! :) Yep, I bought some at $18 (made an offer). I was also
> dismayed that the seller hiked the price afterwards, no idea whymaybe
> they think they're a hot commodity. I haven't received mine yet, but
> when I do I'll report back on condition/operation.
>
> Cheers,
>
> Nick
>
> On Mon, Dec 7, 2020 at 6:06 AM Richard Scales 
> wrote:
>
>> Hello, - I did not see that myself but I know someone who purchased @
>> $18, he sent me the link to the sale which then showed $35 - disappointing
>> :-(
>>
>> - Richard
>>
>>
>> On Monday, 7 December 2020 at 13:59:02 UTC philthepill wrote:
>>
>>> did you notice that he hiked the price from $18 ( each for first 20 sold
>>> )  to $35 now
>>>
>>> Pharma Phil
>>>
>>> -- Original Message --
>>> From: Richard Scales 
>>> Date: December 7, 2020 at 3:23 AM
>>>
>>> Anyone looking for SP-101's could try here:
>>>
>>> #S2T5 Beckman SP-101 Gas Discharge 1 Digit 7-segment Display
>>> 
>>>
>>>
>>> Not my auction etc.etc.
>>>
>>>
>>> On Tuesday, 1 December 2020 at 21:49:34 UTC newxito wrote:
>>>
>>> I already have the domain and the web space but I will have a look at
>>> blogger, thanks Terry.
>>> I've already learned something today. A friend told me that even for a
>>> private website I absolutely need a privacy policy and it is better to have
>>> also a "legal notice"... that's annoying!
>>>
>>>
>>>
>>> --
>>>
>>> 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+...@googlegroups.com.
>>>
>>> To view this discussion on the web, visit
>>> https://groups.google.com/d/msgid/neonixie-l/4f44ed53-d6ef-4750-8c75-ef946ad22081n%40googlegroups.com
>>> .
>>>
>>>
>>>
>>>
>>>
>> --
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>> 
>> .
>>
>

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Re: [neonixie-l] Surplus panaplex displays

[Richard Scales]

Also interested in SP-101..

 - Richard


On Friday, 11 December 2020 at 01:09:15 UTC M1 wrote:

> I wouldn’t mind getting SP-101 units.  I would like to get them in 
> quantities of 8, but would rather get all 60 units.   Please let me know 
> how much you would take.
>
>  
>
> Someone was selling the SP-352 new for $10 each.  I bought 48 of those 
> from him.  I can only guess the price would be around that since the units 
> you have are bigger although only single Digit.  Again, I have no idea.
>
>  
>
> Michail Wilson
>
> 206-920-6312 <(206)%20920-6312>
>
>  
>
> *From:* neoni...@googlegroups.com  *On Behalf 
> Of *Bill van Dijk
> *Sent:* Thursday, December 10, 2020 4:37 PM
> *To:* neoni...@googlegroups.com
> *Subject:* [neonixie-l] Surplus panaplex displays
>
>  
>
> As an ongoing part of my effort to rationalize my parts inventory with the 
> likelihood of becoming an actual project, I have a bunch of Panaplex 
> displays up for grabs. Here is the list:
>
>  
>
> From left to right:
>
> Babcock SP-101 (large single digit) 60 units, used
>
> Babcock SP-352 (smaller dual digit) 28 units, used
>
> Sperry SP-736 (small 2 digit) 6 units, NOS
>
> Sperry SP-735 (+, -, 1, and a single digit) 12 units, NOS
>
> Sperry SP-333 (three small digits) 1 unit, NOS
>
>  
>
> The used units have some glue on the glass where there was a strip of 
> paper glued on to hide the bottom part of the display. Any units that had 
> any visible signs of silvering on the glass have already been discarded. I 
> have not tested any of them. I would like to sell them all as one lot. 
>
>  
>
> I have no idea what a fair price would be, so anyone who is interested 
> please send me a PM with your offer. I will wait until Dec. 15 to decide. 
> Please note you bid is for the parts described, shipping will be extra, to 
> be determined when I know the destination (at cost).
>
>  
>
> Give yourself a Christmas present! J
>
>  
>
> Thanks, Bill van Dijk
>
>  
>
> -- 
> You received this message because you are subscribed to the Google Groups 
> "neonixie-l" group.
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> To view this discussion on the web, visit 
> https://groups.google.com/d/msgid/neonixie-l/016401d6cf55%24b50e4770%241f2ad650%24%40gmail.com
>  
> 
> .
>

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RE: [neonixie-l] Surplus panaplex displays

[Michail Wilson]

I wouldn’t mind getting SP-101 units.  I would like to get them in quantities 
of 8, but would rather get all 60 units.   Please let me know how much you 
would take.

Someone was selling the SP-352 new for $10 each.  I bought 48 of those from 
him.  I can only guess the price would be around that since the units you have 
are bigger although only single Digit.  Again, I have no idea.

Michail Wilson
206-920-6312

From: neonixie-l@googlegroups.com  On Behalf Of 
Bill van Dijk
Sent: Thursday, December 10, 2020 4:37 PM
To: neonixie-l@googlegroups.com
Subject: [neonixie-l] Surplus panaplex displays

As an ongoing part of my effort to rationalize my parts inventory with the 
likelihood of becoming an actual project, I have a bunch of Panaplex displays 
up for grabs. Here is the list:

>From left to right:
Babcock SP-101 (large single digit) 60 units, used
Babcock SP-352 (smaller dual digit) 28 units, used
Sperry SP-736 (small 2 digit) 6 units, NOS
Sperry SP-735 (+, -, 1, and a single digit) 12 units, NOS
Sperry SP-333 (three small digits) 1 unit, NOS

The used units have some glue on the glass where there was a strip of paper 
glued on to hide the bottom part of the display. Any units that had any visible 
signs of silvering on the glass have already been discarded. I have not tested 
any of them. I would like to sell them all as one lot.

I have no idea what a fair price would be, so anyone who is interested please 
send me a PM with your offer. I will wait until Dec. 15 to decide. Please note 
you bid is for the parts described, shipping will be extra, to be determined 
when I know the destination (at cost).

Give yourself a Christmas present! ☺

Thanks, Bill van Dijk

[cid:image001.jpg@01D6CF17.1847BB80]
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[neonixie-l] Re: Bad batch of Burroughs 6844A nixies

[chuckrr]

Burroughs 6844A is domed not flat.   I also have some National 
Electronics NL-6844A tubes.  Frankly, I have had much better

luck with the National Electronics brand.   This recently purchased 
batch of (8) Burroughs 6844A tubes is a bad batch.

The boxes all are stamped MAR 4 1968.  The tubes themselves are 
date-coded 6750 F20.  In white letters stenciled on the glass:

"Burroughs 6844A NIXIE".

 

The test I did was that the anode got connected to +170 volts DC 
through a 15k resistor.   Then the digit cathodes were selectively

grounded to the negative side of that power supply.    On all (8) of 
these Burroughs tubes, most of what is seen is an intense glow concentrated

around the tiny internal wires which connect the digit cathodes of the 
stack, to the pins.   These tiny wires pass closely to the outside of the

Anode casing which surrounds the digit stack.   The glow strikes in the 
wrong place.   The glow is around the lead wires instead of being

around the digits.    I am very confident from the way these tubes were 
in those boxes, that only one of the batch had even ever been out of the box.

 

So I am curious what causes the glowing lead wires.

 

Chuck

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[neonixie-l] Surplus panaplex displays

[Bill van Dijk]

As an ongoing part of my effort to rationalize my parts inventory with the
likelihood of becoming an actual project, I have a bunch of Panaplex
displays up for grabs. Here is the list:

 

>From left to right:

Babcock SP-101 (large single digit) 60 units, used

Babcock SP-352 (smaller dual digit) 28 units, used

Sperry SP-736 (small 2 digit) 6 units, NOS

Sperry SP-735 (+, -, 1, and a single digit) 12 units, NOS

Sperry SP-333 (three small digits) 1 unit, NOS

 

The used units have some glue on the glass where there was a strip of paper
glued on to hide the bottom part of the display. Any units that had any
visible signs of silvering on the glass have already been discarded. I have
not tested any of them. I would like to sell them all as one lot. 

 

I have no idea what a fair price would be, so anyone who is interested
please send me a PM with your offer. I will wait until Dec. 15 to decide.
Please note you bid is for the parts described, shipping will be extra, to
be determined when I know the destination (at cost).

 

Give yourself a Christmas present! :)

 

Thanks, Bill van Dijk

 



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[neonixie-l] Re: Bad batch of Burroughs 6844A nixies

[gregebert]

Do these have dome-tops, or are they flat ?

I have several dead/near-dead Burroughs 5031 and 6844 nixies, which are the 
predecessor of the legendary 5092. All of them have dome-tops. I suspect 
that the 6844's you have might be the same construction as the 5031. I have 
a few of these myself, and no amount of high-voltage/high-current has been 
able to recover them. I concluded that they have leaked, rather than 
suffered from cathode poisoning. I have others that have sputtered, leaving 
a dark residue inside the glass, and a few with cathode-poisoning that just 
dont want to recover.

I dont know where you got them, but it wouldn't surprise me if they were 
sold as "untested".

Give one of them a trip thru the microwave oven and see what happens. I'm 
gonna do that to one of mine.


On Thursday, December 10, 2020 at 3:37:55 PM UTC-8 Chuck wrote:

> I would like to ask the group about an experience I am having with a batch 
> of (8) Burroughs 6844A nixies just purchased.
>
> They are new in box from 1968.  All have same date stamp Mar 4, 1968.   As 
> far as I can tell they have never been out of
>
> these original boxes.I tested them and they all malfunction the same 
> way.   The tiny wire leads inside the tube which
>
> connect the digit cathodes to the pins get surrounded by a bright neon 
> glow, and the digits never strike.  Once in a while
>
> by connecting and reconnecting rapidly, I can get a digit to strike, but 
> not often.
>
> What is going on inside these tubes which causes this?   They were tested 
> at 170 volts DC with 15k anode resistor.  Dropped that down
>
> to 10k for a few tests, which helped a bit with some partial digits.   But 
> this entire batch is bad.   What causes this?
>
> The glow seems plenty bright.Thanks,  Chuck
>
>  
>
>  
>

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[neonixie-l] Bad batch of Burroughs 6844A nixies

[chuckrr]

I would like to ask the group about an experience I am having with a 
batch of (8) Burroughs 6844A nixies just purchased.

They are new in box from 1968.  All have same date stamp Mar 4, 1968.   
As far as I can tell they have never been out of

these original boxes.    I tested them and they all malfunction the 
same way.   The tiny wire leads inside the tube which

connect the digit cathodes to the pins get surrounded by a bright neon 
glow, and the digits never strike.  Once in a while

by connecting and reconnecting rapidly, I can get a digit to strike, 
but not often.

What is going on inside these tubes which causes this?   They were 
tested at 170 volts DC with 15k anode resistor.  Dropped that down

to 10k for a few tests, which helped a bit with some partial digits.   
But this entire batch is bad.   What causes this?

The glow seems plenty bright.    Thanks,  Chuck

 

 

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Re: [neonixie-l] How to kill a microcontroller with one finger

[newxito]

I might have to clarify: I'm not saying that the IC has a problem and that 
I don't recommend it for projects. As I said, it works very well. 
The manufacturer itself has set the status to "not recommended for new 
designs", they have developed a new version.

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Re: [neonixie-l] Re: IN-16 without Neon but with Argon

[Paolo Cravero]

Hello.
I was wrong on the leak direction, indeed. I did further experiments with
the couple of tubes that react to the neon tester (HVAC source applied to
one pin, and holding the tube with the other hand).

I could pile up power supplies to just below 700V and digits still don't
light fully. Given its small surface, the decimal point always works. The
voltage drop in the tube is between 350 and 390V depending on the current.
At 9mA it gets warm to the touch. Pleasantly warm, could be 35°C (+15°C
from room T). Then I tried again 630V @ >=4mA and it is still possible to
get a glow with the 350V drop. The nice thing is that the glow constantly
moves up and down the digit, therefore with a proper power supply it could
be used in some art display. Colour changes with current.

It has been a nice practical learning experience.
Paolo


On Wed, Dec 9, 2020 at 11:18 PM Christian Riise Wagner <
c.riisewag...@gmail.com> wrote:

> That's pretty cool that it somewhat lights up. However I think that you're
> mistaken in your assumption that the neon has escaped, leaving only argon
> in there. The gas mixture in a Nixie tube is at a very low pressure, so my
> guess is that atmospheric air has leaked into the tube, thus increasing the
> pressure inside. This would also explain why the voltage needs to be that
> high. And ionized atmospheric air does indeed light up purple.
> onsdag den 9. december 2020 kl. 21.38.54 UTC+1 skrev Paolo Cravero:
>
>> Hello.
>> As I said in the IV-6 thread, I bought some apparently dead IN-16 that
>> react to a Neon tester (HVAC) with a violet/lavender glow.
>>
>> Since there is gas, it will light up one way or another!
>>
>> This is the promising result with 632 Vdc at about 9 mA:
>> https://youtu.be/NfKj6_Kf8DE (color does not match reality).
>>
>> To me it looks like a normal Nixie at undervoltage conditions. I can
>> probably add some other 100V using battery powered DC-DC boosters.
>>
>> Paolo
>>
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Re: [neonixie-l] How to kill a microcontroller with one finger

[Frank Bemelman]

Or just bad luck. I don't think there is a generic design problem. Usually
and in particular when I have been moving around - I touch some ground
first to discharge myself just to be on the safe side...

On Wed, Dec 9, 2020 at 8:30 PM newxito  wrote:

> I just wanted to share something that happened to me yesterday. I killed
> the ESP32 on my nixie board just by touching the adjustable voltage
> regulator IC with one finger. I’m pretty sure that I touched the feedback
> pin causing the voltage to increase.
> I already changed the design, and, in the future, I will only use
> regulators with fixed output voltage. I hope they are less sensitive.
>
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> 
> .
>


-- 
Vriendelijke groeten,
Frank Bemelman

Frank Techniek
Vennestraat 11X
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Telefoon +31 252 769 178

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[neonixie-l] Re: IV-6 background variations

[Yohan Park]

The blue ones I have (and looks like yours as well) also show brass in some 
places (top and bottom). I have over 100 assorted IV-6 tubes here and to me 
it looks like they're supposed to be brass color but some chemical reaction 
has turned them blue.

On Monday, December 7, 2020 at 6:32:40 PM UTC+1 Paolo Cravero wrote:

> Hello.
> Today I received some assorted used IV-6 VFDs and two of them have a blue 
> background. The lot spans from 1976 to 1992, so I am not surprised there 
> have been variations in base materials, but I never saw them before as I 
> haven't got many VFDs (yet). Maybe I am a bit disappointed because I got 
> only two blue's :) I am wondering how common they are.
>
> In the same purchase I bet on a lot of IN-16 sold as "for spare", which 
> are obviously 100% outgassed even if visually intact. Can't raise a 
> complaint, I've lost a bet, while I was hoping for some cathode poisoning. 
> Besides smashing a couple under a hammer and testing fall against different 
> floor materials, has anyone got a clue what do people do with dull Nixies?!
>
> Paolo
>

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Re: [neonixie-l] How to kill a microcontroller with one finger

[newxito]

yes, the schematic in the datasheet. I hope it will work as expected, I 
already ordered some new boards.

bani schrieb am Donnerstag, 10. Dezember 2020 um 12:33:23 UTC+1:

> Are you just using the reference design for AP63205WU-7 ? 
>
> -Dan 
>

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Re: [neonixie-l] How to kill a microcontroller with one finger

[Dan Hollis]

Are you just using the reference design for AP63205WU-7 ?

-Dan

On Thu, 10 Dec 2020, newxito wrote:


I was using the datasheet schematic of the MP1584 regulator. The FB divider
for 3.3V is 124k to Vout and 40.2k to ground. The regulator works great but
now is no longer recommended for new designs anyway.
I switched to AP63203WU-7 for 3.3V and AP63205WU-7 for 5V. The design is
now cheaper and uses less components. 2A should be enough for RGB-LEDS and
peripherals.

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Re: [neonixie-l] How to kill a microcontroller with one finger

[newxito]

I was using the datasheet schematic of the MP1584 regulator. The FB divider 
for 3.3V is 124k to Vout and 40.2k to ground. The regulator works great but 
now is no longer recommended for new designs anyway. 
I switched to AP63203WU-7 for 3.3V and AP63205WU-7 for 5V. The design is 
now cheaper and uses less components. 2A should be enough for RGB-LEDS and 
peripherals.

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Re: [neonixie-l] How to kill a microcontroller with one finger

[petehand]

Ah, this is not uncommon. A lot of AVR Dragons were slain for the same 
reason. Touching the regulator affects its feedback and therefore its 
output voltage. A tiny ESD, not enough to cause any damage, can drive the 
output high for enough milliseconds to cook a 3.3V IC downstream.

On Wednesday, December 9, 2020 at 3:33:06 PM UTC-8 nixiebunny wrote:

> The voltage feedback resistor is a low impedance node on every voltage 
> regulator design that I have worked with. Typically 1k ohm. I don't see how 
> that could happen. 
>
>
> On Wed, Dec 9, 2020, 12:30 PM newxito  wrote:
>
>> I just wanted to share something that happened to me yesterday. I killed 
>> the ESP32 on my nixie board just by touching the adjustable voltage 
>> regulator IC with one finger. I’m pretty sure that I touched the feedback 
>> pin causing the voltage to increase. 
>> I already changed the design, and, in the future, I will only use 
>> regulators with fixed output voltage. I hope they are less sensitive.
>>
>> -- 
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>> "neonixie-l" group.
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>>  
>> 
>> .
>>
>

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