TTL homebrew CPUs
ed at ed-thelen.org
Fri Jul 13 00:22:03 CDT 2007
Drifting from TTL homebrew computers into NE-2 relaxation oscillators -
The year Sputnik went up - October 1957 - I built a Sputnik oriented
Christmas tree ornament for my sister.
The "earth" was 3" transparent plastic tube cylinder barely large enough
to hold a selenium rectifier, small electrolytic capacitor,
47K resistors and disk capacitors.
The transparent tube orbit had three support tubes,
and contained the seven NE-2 gas tubes.
I thought it cute but was disappointed that the start-up
and operation was so unpredictable. Direction of rotation
and number of satellites was variable.
But my sister was delighted, and has it to this day -
but it now goes on the tree only when I visit.
Time has been unkind.
The gleaming wires have turned ugly black,
the plastic yellowed, the lamp cord dried and cracked,
and I forget if it still works ... .
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