21 Aug
2008
21 Aug
'08
11:47 a.m.
>>>> "Chuck" == Chuck Guzis
<cclist at sydex.com> writes:
Chuck> On 21 Aug 2008 at 10:25, William Blair wrote:
> I have in the past found plenty of relay-based
logic circuits
> on-line but am having a really tough time finding any binary tube
> circuits with component values. If there's enough material
> submitted to justify it, I might start a web page on this topic
> or, at least, a blog that links to the relevant materials on-line.
Chuck> DIY digital projects using vacuum tubes were extremely rare,
Chuck> mostly due to cost. About the only one that comes to mind is
Chuck> the early 60's telephone-dial calculator from Electronics
Chuck> Illustrated--and even there, the storage elements were neon
Chuck> lamps, with interstage driving being accomplished by vacuum
Chuck> tubes....
Chuck> Many of the DIY binary circuits involving tubes simply used
Chuck> them as multivibrators.
My father built an electronic keyer out of vacuum tubes somewhere in
the 1950s. Unlike most other keyers from that era which were
multivibrator type circuits, this one was an actual logic circuit,
with tubes used in flip-flops. It was still working perfectly around
1971.
I never saw the schematics for it, though, and I doubt it exists any
longer.
paul