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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