[time-nuts] Digital Clock kit - no Integrated circuits!

[Stanley Reynolds]

Knowledge of history doesn't = having lived it :-)

http://www.play-hookey.com/digital/electronics/dtl_gates.html

3 to 1 is not all that odd if you have 5 to 1 and 2 to 1 ratios as the page above indicates.

Stanley



----- Original Message ----
From: Bob Camp <lists at cq.nu>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Fri, January 8, 2010 8:10:34 PM
Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits!

Hi

It seems like the diode to resistor ratio is a bit off in that design. 

In order to go into further detail, I would have to admit to starting out in the pre-integrated circuit logic era ....

Bob


On Jan 8, 2010, at 8:07 PM, Tom Clifton wrote:

> http://transistorclock.com/  has a very interesting (though a bit expensive) kit for sale.  A 10" x 11" circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays.  Suitable for framing...  As delivered runs on 60hz but there is a note about conversion to 50hz mains.  You can buy a  bare board, just the components or a full kit.
> 
> You must see it to believe it!
> 
> Tom
> 
> 
> 
> 
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