Eric
Sorry I have been rushing around and not reading your posts properly. I
realise now (having read them s_l_o_w_l_y what you are doing. The Dance
ECC book (which you now have complete) is the best reference for
circuits I have (Weston being equally best in other regards). The Cold
Cathode Tube book is much more lightweight but I will assemble it as a
pdf and put it up for everyone to download (I'm sure it was around as a
pdf already?).
Cheers, and with less haste, Grahame
On 29/03/2011 09:55, Tidak Ada wrote:
Hi Graham and Mike,
Thanks for pushing me in teh right direction. I was so fixed to filamentless
solutions that B was blind for this pages. Gives intresting rading stuff and
hopefully a nice experinementing time time. Furthermore I see, I have to
think even about a transistor solution , as a possibility to deminish power
consumption.
Graham as you will understand now, the pages in queston, I alreday have and
what's more, I received the missing pages from Dance's book 'Electronic
Counting Circuits' this night from Italy.
Anyhow, I would be glad to receive copies from the other books, Cold Cathode
Tubes you mentioned when you have found time to scan them. May be you can
start with pages that apply to my problems sooner, but tyhat's up to you.
Cheers,
eric
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Grahame Marsh
Sent: dinsdag 29 maart 2011 9:52
To: [email protected]
Subject: Re: [neonixie-l] Re: 3rd try! Mullard Z700 U trigger tubes
Hi Eric
You need page 134 onwards in Dance Electronic Counting Circuits for vacuum
valve input and couplers upto 1 MHz. Do you have this would you like me to
scan and email?
Cheers
Grahame
On 28/03/2011 22:25, Tidak Ada wrote:
Hi Graham,
Thanks for your answer.
I just discovered the GTE175M and GDE120T are unsuitable, because the
datasheets say the first only can manage frequencies up to 1kHz and
the second has a ionisation time of 1 ms and a deionisation time of 5 ms.
So the challenge is to find a circuit that can amplify the output of
the clock oscillator to an appropriate level at at least 500 kHz and
to find a transfer circuit that is able to manage>40 kc's. Otherwise I
will need to devide the clock to less a s 1kHz by logic circuits.
Scans of the original size at 300dpi bitmap size in PNG format are
most convenient, for they have the smallest file size. Also PDF's made
fron such scans are sufficiënt. Please don't send color scans, for
they are trice as big as greyscale images. For photo's and greyscale
immages I always use greyscale scans in jpeg at high quality compression
(8 to 10) or even TIF's.
Thanks for helping me.
I will look what I can do with the German booklet. There is an other
guy intrested too.
eric
-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Grahame Marsh
Sent: vrijdag 25 maart 2011 13:13
To: [email protected]
Subject: Re: [neonixie-l] Re: 3rd try! Mullard Z700 U trigger tubes
Eric
Yep, I forgot about the EZ10B but it is available and fit for 1 MHz.
Again I've never played with one. I've used the much larger and
clunky dekatrons.
I have Electronic Counting Circuits as a book so I can scan the pages
you list. What dpi would you like them scanned at and what file
format? The book is too large for my A4 scanner to do 2 pages per
scan so you'll get one page per image. I will zip them and then let
you know where to download them from (rather than what might be a large
email attachment).
I also have 2 other books by Dance "Cold Cathode Tubes" which
circulates as a pdf and "Photoelectronic Devices" (1969) which I have
still to scan and pdf.
My German is rudimentry: numbers, thank you, yes, no, food, beer and
wine (the essentials) so I can get by... I'd like to see the book (I
guess others would as well) because the diagrams will be universal.
My wife's German is much better than mine and I normally use her as my
translator.
Grahame
On 24/03/2011 16:53, Tidak Ada wrote:
Grahame,
Thanks for your answer.
Those EZ10B's are specified for f(t) of 1 Mhz ! I have a 10ppm 400kHz
TCXO, so I hope I can manage these high frequencies. However, I am
afraid the drivers will make the bottle-neck, Before I got the
dekatrons, I planned to devide with CMOS, but the challenge of an
(almost) all tube design is temptative. Must I suppose you have no
experience with those high speed dekatrons ?
The choice for cold cathodes is to minimize the supply power.
Thanks for sending the MC Neale book.
I forgot to send this answer to your last reaction to me. Therfore I
was a little confused about the book. Thought first it was an answe
on my quetion
below:
About the Dance book: Do you have a complete scan of all pages or is
it the same as my copy and do you miss the pages 310 - 374 ? And what
about the pages 376 to the end (containing the register) ?
In case you have the missing pages within reach, I should highly
appreciate a (pdf) copy of them to complete my book.
In case you understand the German language, I possibly can serve you
a copy of "Glimmröhren und Kaltkatoden-Relaisröhren"; Radio Praktiker
Bücherei 28; Franzis Verlag by Otto paul Herrnkind (160 pages).
Kind regards,
eric
-----Original Message-----
From: [email protected]
[mailto:[email protected]]
On Behalf Of Grahame Marsh
Sent: donderdag 24 maart 2011 10:08
To: [email protected]
Subject: Re: [neonixie-l] Re: 3rd try! Mullard Z700 U trigger tubes
Eric
I've never used a GDT125T but I have used GTE175M as an interstage
coupler using the commonly available circuit. Not suprisingly it
worked! I've only divided by 50 from 50Hz to get 1pps. Using a
divide by 10 dekatron driven with sine wave , a GTE175M coupler and a
10 cathode dekatron with cathodes 0 and 5 commoned together to get
divide by 5 - a trick that works in 50 Hz land but a 12 cathode
dekatron would be needed in 60 Hz land. I have also built vacuum
valve couplers -the advantage is a simpler power supply the
disadvantage is the
heater supply.
400kHz is a real challenge for gas filled counting. Mostly a count
in the 10's kHz is the highest you'll get. The 6879 has a maximum
frequency of 5 kHz for example. High vacuum counters (eg E1T) get to
30 kHz (selected tubes get to 100 kHz). But that said, there were
some remarkably high speed gas filled counters made just as the
semiconductor was taking over. But are they available?
Grahame
On 23/03/2011 22:22, Tidak Ada wrote:
Grahame wich tube is more usefull to focus on to drive dekatrons:
the GTE175M or the GDT125T ?
I liked to make a clockrate divider beginning with two Elesta EZ10B,
followed by three Sylvania 6879's, preferrably driven bij cold
cathode tubes, and avoiding semiconductors. The highest frequency to
manage is 400kc's
eric
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