I built one of these when I was 15. It didn't work
when I finished it. I sent it to SWTPC for repair. DON
LANCASTER himeself fixed it, and sent me a note thatI
should get a better soldering iron (a solder bridge
and some _horrible, evil_ Molex soldercons (the worst
sockets ever made) were responsible for the problems.
In any event, I would go down the timing chain; if the
60 Hz is not at some decent level for (the 555's?),
you've got problems. Do you have the (unijunction
transistors?) in correctly - maybe a case difference
between TO-92 and "the other ones, I forget" made of
metal?. I have seen a surprising number of
bad/mismarked 1n914/4148 diodes surplus. Are the caps
and resistors definitely the right values. The R and C
values are all critical around here, and I've seen
mismarked caps. Hopefully, you have at least a scope.
Funny story: my grandfather, who never graduated the
8th grade, a machinist, helped - that is, made - all
the cases for my projects out of wood (so much for FCC
part B). We were working on his dining room table with
the TVT and a modified 9" TV set (which HE had
repaired(!). A friend of his, a senior engineer at
Zenith, came unpectedly to visit and his eyes just
about fell out of his head. "We've got some stuff like
that at Zenith - but they won't even let me into that
lab, and I've only seen it through a window!!".
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Received on Wed Jun 19 2002 - 22:27:07 BST