29 Nov
2009
29 Nov
'09
7:56 a.m.
From: cclist at sydex.com
On 28 Nov 2009 at 22:09, dwight elvey wrote:
Hi Chuck
Good point diodes and o6s makes the ultimate in
low tec computing. Diodes can be had for less than a
penny each. One resistor and a pile of diodes makes
a reasonable gate. All that is needed is an inverting
and buffering function. The 06 fits the bill.
Dwight
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I still like the 38s the best. Open collector
parts can do so much more than just a logic function.
The '12 is an OC 3-input NAND. I like 3-input gates better because
they lower the part count in circuits like J-K flip flops. If you
admit diodes to the mix, there's no reason that 38s or even 06s
wouldn't work just as well.
RTL and DTL were great when it came to wired-ORing. That 903 wasn't
a bad choice for the AGC.
--Chuck