I'll (slightly) stick up for the WITCH restoration team... I too donated
some dekatrons, but because I live only an hour away I used the donation as
an excuse to go see the WITCH in person :) This was 2+ years ago, and the
machine was very definitely non-functional due to power supply
So, did they actually have most of the tubes already?
I can't imagine them finding such a quantity of some of them.
John K
- Original Message -
From: Jon
To: neonixie-l@googlegroups.com
Sent: Wednesday, November 21, 2012 6:43 PM
Subject: Re: [neonixie-l] Harwell Computer
Hi all,
I'm new to this group, and I would appreciate if somebody could help me or
point me in the right direction.
I'm a newbie when it comes to electronics, but I'm building my first Nixie
clock, and experiencing some problems with it.
it's before work right now, so I will post a schematic
Yesterday I wrote to Kevin Murrell, trustee of The National Museum of
Computing, on behalf of those who donated tubes and did not perhaps receive
acknowledgement of any kind. In my capacity as a moderator of the group -
personally I had no dekatrons to donate.
Kevin has responded to me today
Here's the schematic: http://secretsather.com/delme/schematic.png
And the pic: http://secretsather.com/delme/IMGP0986.JPG
Thanks again to anyone who's willing to help.
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I shot a new movie today with an improved driving stage with transistors
driven by a square wave generator. I could run the GSA10G up to 2KHz with
this stage, higher speeds can be attained with higher voltage on the guide
pulses if necessary. Here's the clip:
On 11/21/2012 2:13 PM, secretsather wrote:
Here's the schematic: http://secretsather.com/delme/schematic.png
And the pic: http://secretsather.com/delme/IMGP0986.JPG
Thanks again to anyone who's willing to help.
Those are SN75468 chips, right?
The want all of their pin 9 connected to a
If you say the whole circuit draws 500mA, you mean the total current
of your HV circuit plus the LV circuit, right? You should measure how
much of this 500mA is drawn by the HV circuit and how much by the LV
circuit. If you're pumping 30mA through your nixie, it is not strange
the HV circuit draws
I just had a look at your picture, what is the function of that
enormous capacitor you have there? It looks like this is C5 in your
schematic to buffer the high voltage. I would say it is way too big
and might even cause the strange problem you describing (dependent on
the type of 12V power supply
A last movei before bedtime: http://www.youtube.com/watch?v=owPnu6B-xHg I
used the GSA10G to drive a GR10J large Nixie at just 2mA anode current for
the Nixie as that is the limit in the datasheet for the GSA10G. All figures
lit up beautifully at 2mA anode current but by adjusting each
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