16 Jul
2007
16 Jul
'07
11:43 a.m.
On Mon, 16 Jul 2007, Chuck Guzis wrote:
Date: Mon, 16 Jul 2007 11:29:48 -0700
From: Chuck Guzis <cclist at sydex.com>
Reply-To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
Subject: Re: core-logic clock / was Re: TTL homebrew CPUs
On 16 Jul 2007 at 10:31, Brent Hilpert wrote:
Arent there some electronic organ circuits that use NE-2s that way as
synchronised oscillators?
Seems to me a grid cap of the right type was used for the sleeve.
Peter Wallace
Sometimes it's fun just to go through the
design exercise. An initial thought
was that, either:
- you'd need a "non-core" latch to hold the state of the core counter
logic
before driving the Nixies because you don't get a static state level out of
the cores, at which point you have as much complexity of non-core logic as you
would without using the cores;
I suppose if we wanted to stay with the general spirit of things, one
could use a cold-cathode thyratron. I've seen where ordinary NE-2s
are triggerd by placing the bulb in a conductive sleeve, shielding it
from external light and simply pulsing the shield to trigger the
lamp. Heaven forfend that I should use an SCR or transistor! I
wonder if the clock could be derived from line frequency without much
more than a few diodes.