21 Aug
2008
21 Aug
'08
11:27 a.m.
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.
DIY digital projects using vacuum tubes were extremely rare, mostly
due to cost. About the only one that comes to mind is the early 60's
telephone-dial calculator from Electronics Illustrated--and even
there, the storage elements were neon lamps, with interstage driving
being accomplished by vacuum tubes.
I recall seeing the article, being really interested and put off by
the cost for something that would add more slowly than paper-and-
pencil.
Many of the DIY binary circuits involving tubes simply used them as
multivibrators. I recall a project that provided a 115 volt, 60 Hz
precision supply for an ordinary electric clock from a crystal
frequency reference (the when and where escapes me, however).
Cheers,
Chuck