I have a few radar books describing theory and actual circuits - I
can scan some if needed too.
John K.
----- Original Message -----
From: [email protected]
To:
Cc:
Sent:Mon, 10 Feb 2014 23:30:04 +0100
Subject:RE: [neonixie-l] Elesta EZ10/A/B tester refurbished!
Would be nice David!
I hope it doesn't cost too much of work, but I really appreciate your
offer.
Even if I decide not tu build it it will be fine reading
eric
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On
Behalf Of David Forbes
Sent: maandag 10 februari 2014 22:58
To: [email protected]
Subject: Re: [neonixie-l] Elesta EZ10/A/B tester refurbished!
Eric,
I have a textbook "Digital Logic Circuits" or similar that describes
it in
depth. I will see about scanning it.
On 2/10/2014 1:51 PM, Tidak Ada wrote:
> Yes, I found a HP pre-nixie counter that uses it, but no clear
theory.
>
> eric
>
> -----Original Message-----
> From: [email protected]
[mailto:[email protected]] On
> Behalf Of David Forbes
> Sent: maandag 10 februari 2014 21:00
> To: [email protected]
> Subject: Re: [neonixie-l] Elesta EZ10/A/B tester refurbished!
>
> On 2/10/2014 12:44 PM, Tidak Ada wrote:
>> Hmm could be, but despite I have heard about it, I am not familiar
>> with the Phamtastron circuit. Does it deliver a sine or an
block/pulse at
> the output?
>> I have to look for some clear theory.
>>
>> eric
>
> Eric,
>
> Google does not help with the Phantastron, as someone borrowed the
name
for
> a product.
>
> The circuit is also called a Miller sweep circuit. It is used in
> oscilloscopes, and in old digital pulse circuits as a frequency
divider. A
> pentode tube generates a sawtooth wave, and is triggered to reset
by a
> synchronizing signal only when near the end of the sweep.
>
> Look at any old HP frequency counter for a decimal divider using
the
> Phantastron. They were also used in early television sync
generators.
This
> is why the old television line count was a product of small numbers
such
as
> the US 525 line TV: 525 = 5 * 5 * 7 * 3.
>
> --David Forbes
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