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From: firstname.lastname@example.org ("Bored With the Bitch")
Subject: Re: Digital divide by ten, 1949 style
Date: Thu, 19 Sep 2002 03:19:37 GMT
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On 15 Sep 2002 09:46:32 -0700, email@example.com (Tim Shoppa) wrote:
>In a recent thread on sci.electronics.design, we explored some approaches
>to divide-by-ten without using IC's. (Go to http://groups.google.com/ and
>search for "Decade counter without IC's"). Here's an approach I found
>in Vol. 19 of the Radiation Laboratory Series, _Waveforms_:
>They do it with just ten tubes, and the output is BCD on 4 neon bulbs.
>Comments on similar counters would lead me to believe that the design is
>good to a few MHz.
>Maybe they do cheat a little with respect to the previous thread; is a
>dual triode the 1949 equivalent of an IC? :-)
A very long time ago (in the 1960's) I came across a radiation counter that
had four decades of neon-tube readout counters on its front. I was just
getting started in electronics back then and had a chance to look at the
schematic of the unit. The counters did not use any vacuum tubes or
transistors, but instead appeared to rely on the breakdown characteristics of
the neon tubes used as the display. All I can remember is that the NE-2's (or
whatever they were) were arranged in some kind of ring counter with lots of
diodes and capacitors in the circuit.
If anybody has a schematic for such a counter, I'd appreciate it.
Erikc (alt.atheist #002) | "An Fhirinne in aghaidh an tSaoil."
BAAWA Knight | "The Truth against the World."
| -- Bardic Motto
At one point in time, many of us actually had Jesus as
our personal lord and saviour. Unfortunately, we later
had to dismiss him for incompetence, gross negligence,
misconduct and consistent failure to show up for work.
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