TTL homebrew CPUs

dwight elvey dkelvey at
Wed Jul 11 08:40:12 CDT 2007

>From: "Chuck Guzis" <cclist at>
>On 10 Jul 2007 at 21:31, dwight elvey wrote:
> > You could also put a current source instead of a resistor.
> > This can be made with either a transistor and s few resistors
> > and diode or a jfet.
>Uh, Dwight, we're talking "vintage" gas triodes here.  If I had a
>transistor of any sort, why would I be messing with neons or
>thermionic gas triodes?

Hi Chuck
Ok, are we allowed to use a vacuum triode? Using high voltage
to help linearize the saw tooth seems to be the sledge hammer
What was it that Tektronics did with tubes to get the nice
linear sweep? They did something that used a constant current
to charge the capacitor.


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