16 Jul
2007
16 Jul
'07
10:53 p.m.
On Monday 16 July 2007 14:43, Peter C. Wallace wrote:
On Mon, 16 Jul 2007, Chuck Guzis wrote:
Lowrey used something of the sort in some of their tube models, along with
some rather odd tubes. The description that comes to mind from having seen
them mentioned in an old RCA Tube Manual was "Three-plate tetrode". I never
did get that much of a grip on just how those circuits were supposed to
function, and it's remotely possible that I might still have some service
data available for one of those models, somewhere, if anybody's that
interested..
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
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. 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.