Re: Funny vector drawing and TL082's

DAMN IT! Now how am I, the non EE major, non electronics whiz kid type,
owner of warehouse parts challenged, supposed to figure out stuff like
THAT! :-(

The latest discussions like this, 2114 probs, TTL 74xx part substitutions
are draining all my confidence that I can fix ANYTHING. CUT IT OUT!
Please.

PS I'll get over it soon enough. Maybe it would be best to just ignore
this e-mail...

Clay Cowgill <ClayC@diamondmm.com> on 01/25/99 03:16:30 PM

Please respond to vectorlist@mcfeeley.cc.utexas.edu

To: "'vectorlist@mcfeeley.cc.utexas.edu'"
      <vectorlist@mcfeeley.cc.utexas.edu>
cc: (bcc: Franklin Bowen/MD/CheckFree)
Subject: Funny vector drawing and TL082's

Just thought I'd mention this since it caused me some grief and might
save some of you some trouble...

I was testing a display corrector and was getting weird "squiggles" in
some of the vectors. I suspected a bad ground, but after that checked
out OK I went after the power supplies. After working those over to no
avail I decided to swap out the Exar manufactured TL082 op-amp (common
op-amp in Atari Vector Generators) for a TI made part.

Low and behold, TI parts worked fine, XR marked parts didn't. Weird.
Extra-strange was the fact that vectors would be deformed *in* the line,
and not at the beginning or end points. Beats me what would cause that,
but Exar's off my "approved vendor list" for working on vector
generators. ;-)

-Clay
Received on Mon Jan 25 14:28:08 1999