'scope clock advice please

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   Well, I've been gone for a month and this group is dead. So maybe
my questions will liven it up some. Or maybe everyone else is also on
vacation. I know, this is a repair group. But I will no doubt need to
repair whatever I build. And besides, I get better electronics advice
here, as in more of it and correct, than on the basics group.
   While wasting some time on the computer while being on hold I came
across some small ocsilloscope CRTs, then looking for something to
light one of them up I saw some kits to make oscilloscope clocks. Only
34 bucks for the kit!  
   So I ordered a two inch CRT with electrostatic deflection. Here's a
link to the CRT I ordered:
https://www.ebay.com/itm/5LO38I-Mini-5-cm-CRT-oscilloscope-cathode-ray-tube-FOR-DIY-NOS-BOXED/111978397405?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3Da8915a4a567c484c94f5f3b2d9e743c4%26pid%3D100675%26rk%3D4%26rkt%3D15%26mehot%3Dag%26sd%3D401706260380%26itm%3D111978397405&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3Afb320543-9930-11e9-9594-74dbd1808485%7Cparentrq%3A9b35da7016b0aa19f93d280effb7f16e%7Ciid%3A1
   Then on to ordering the kit. Hah! No dice. The kits are no longer
available. But I think I can still download the code for the
microcontrollers and the files for the circuit boards. Here is a link
to the page that the kit used to be available from:
http://www.dutchtronix.com/ScopeClockH3-1-Enhanced.htm
   The kit was also available from other sources but I can't find it
for sale anywhere. Darn. Maybe someone here bought one of these kits
and never built it and it is collecting dust. If so why not sell it to
me?
    I also need to drive the CRT and I found a simple circuit called
the Mullard's Pupil Oscilloscope. Here's a link:
https://www.instructables.com/id/Mullard-Pupils-Oscilloscope/
    So, if I build the Mullard scope circuit will it drive the two
inch CRT I ordered seeing as how it was made to drive a 1 inch CRT?
And if that works will the Dutchtronix clock circuit work with the
Mullard scope and give me a nice looking display?  
    Look, this is just for fun. I am capable of safely dealing with
the high voltage. But I don't know enough to know if all the parts
will play nice with each other. I have also not built any tube or
valve gear using point to point wiring so a little advice about that
would be greatly appreciated. When it is all done the idea is to have
as much of the tube circuitry as possible exposed with the modern
microntroller stuff hidden away. I like tube stuff and exposed
machinery, always have.  
  I think a one tube scope with a hand wound xmfr could look pretty
cool sitting on a shelf near my tube amplifier.  
Thanks All,
Eric


Re: 'scope clock advice please

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Maybe.  :-)

In principle it ought to work, if you get the voltages correct.  If
you don't, it'll either not work, or damage the CRT or something else.

Among the things you'll need to look at, in matching up the various
circuits and components, are;

-  The required heater (filament) voltage and current for the CRT you
   are using.
-  The cathode, grid and deflection voltages for the CRT you are using.
-  The voltages being created by the clock circuit (microprocessor)
   and being fed to the X and Y inputs of the scope circuit

Read through the data sheet for the DH3-91 CRT that the circuit was
designed to work with (http://www.labguysworld.com/1CP1 (db3-91).pdf)
and for the CRT you bought.

The physical size of the CRT doesn't matter very much (directly) but
a larger or different CRT may have different voltage or current
requirements.






Re: 'scope clock advice please
On Thu, 27 Jun 2019 16:53:56 -0700, snipped-for-privacy@coop.radagast.org (Dave
Platt) wrote:

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Thanks Dave. I downloaded the datasheet for the Mullard tube and I'll
compare it to my CRT when it arrives.
Eric

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Re: 'scope clock advice please
On 2019/06/27 4:28 p.m., snipped-for-privacy@whidbey.com wrote:
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Looks like a fun project! Make some PCBs and offer them here, I'd  
probably buy one just for fun. I've got a few 'scopes sitting around  
that aren't doing anything useful...

As for the Mullard scope, it should work with a larger tube, you just  
may have to raise the deflection voltage a bit. Find the specs on the  
two tubes to see what the deflection differences are - if any!

John :-#)#

--  
(Please post followups or tech inquiries to the USENET newsgroup)
                      John's Jukes Ltd.
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Re: 'scope clock advice please
snipped-for-privacy@whidbey.com wrote:
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** No pics or diagram showing up for me.

   Am I missing something?  


....   Phil  

  

Re: 'scope clock advice please
On 28/06/2019 10:05 am, Phil Allison wrote:
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Might pay to check around, comes up OK for me in Oz


Re: 'scope clock advice please
On 2019/06/27 7:59 p.m., Rheilly Phoull wrote:
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nd a simple circuit called
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Works fine for me in Vancouver, BC...

Nice schematics with valves instead of tubes. Must be some furren idear.

John ;-#)#


Re: 'scope clock advice please
On 28.06.19 4:05, Phil Allison wrote:
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Loads fine here(Netherlands). Interesting circiut diagram.
Needs a few mods, if you dont want a 12v supply.

Re: 'scope clock advice please
Sjouke Burry wrote:
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** Sites sometimes tell me I am using an "ad blocker" - which must be part of Windows 7 cos I never added one.  

 Could that be it ?


....  Phil  

Re: 'scope clock advice please
On 28/06/19 09:14, Phil Allison wrote:
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I doubt it. I am using an adblocker and see the page without problem. I  
don't know what browser you are using, but try using it with all add-ons  
disabled ("Safe Mode" when using Firefox, for instance). If that allows  
you to see the page, you have to go back to normal mode and switch each  
off add-on in turn until you find the one which is stopping the page  
from displaying.

--  

Jeff

Re: 'scope clock advice please
On 28/06/2019 8:55 PM, Jeff Layman wrote:
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Works fine here in NZ and I'm using an adblocker AND an anti-tracking add-on (Privacy Badger, I  
recommend it highly) in Firefox, works in Chrome too.

--  
Shaun.

"Humans will have advanced a long, long way when religious belief has a cozy little classification  
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Re: 'scope clock advice please
On Friday, June 28, 2019 at 4:14:28 AM UTC-4, Phil Allison wrote:
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Odd.. You can try converting the web page to a .pdf right on line.  If you can open this: https://webpagetopdf.com/ or one the many like it, input the instructables url and it will convert it to .pdf.

Re: 'scope clock advice please
On 2019/06/28 1:14 a.m., Phil Allison wrote:
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Hi Phil,

I use this site when I'm not sure where the problem is:

https://isitdownorjust.me/

Hope that helps!

John :-#)#

Re: 'scope clock advice please
On Thursday, June 27, 2019 at 7:05:37 PM UTC-7, Phil Allison wrote:
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Based on all the successful responses, the answer is obviously "YES!"

Re: 'scope clock advice please
http://oscilloscopeclocknixiecrt.com/Kit.htm

https://makezine.com/2007/05/30/35-avr-oscilloscope-clock/

Peter Wieck
Melrose Park, PA  

Re: 'scope clock advice please
On Fri, 28 Jun 2019 03:59:55 -0700 (PDT), " snipped-for-privacy@aol.com"

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I have seen both links. The top one charges $100.00 plus shipping for
the kit minus a CRT. I may go this route. The bottom link is to the
kit that is no longer available. But I can download the files for the
PC boards and the code for the microcontrollers. I did mention this in
my post.
Eric

Re: 'scope clock advice please
https://www.ebay.com/itm/Oscilloscope-Clock-Kit-for-many-crt-types-Wifi-OR-gps-CRT-Cathode-ray-tube-Scope/303198819933?hash=item46980ed65d:g:84wAAOSw3dxbTimZ


Re: 'scope clock advice please
wrote:

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Yeah, I saw that kit. $170.00 and he doesnt't even show a picture of
the clock display. It's too bad I didn't think about doing this a few
years ago when a board could be had for $34.00!
Eric

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