31 Aug
2006
31 Aug
'06
11:25 a.m.
From: "Ethan Dicks" <ethan.dicks at gmail.com>
On 8/31/06, woodelf <bfranchuk at jetnet.ab.ca>
wrote:
Thyratron divider circuits.
http://www.g1jbg.co.uk/thyratro.htm
Divide by any integer, using around 6 components (the practical division
limit is around 6, but I've made them work as a divide by ten).
Jim.
The ads list a 12au7 for about 65 cents in 1955.
In 2006 a generic 12au7
is about $8.00. I suspect a better deal now than 50 years ago.
Hmm... if I leave off seconds and just go with minutes/hours, I think
I have enough. Even with modern wages, a bag full of tubes costs
enough to make me want to simplify the design.
The real trick, now, I guess, is how to take 60Hz mains and clock it
down to 1/60Hz with 1955 technology.
-ethan