27 Aug
2014
27 Aug
'14
5:29 p.m.
On 08/27/2014 03:49 PM, drlegendre . wrote:
That's what I was thinking.. so I set up a test
for 7405's on my little
proto-trainer that I found & rebuilt some time ago.
Guess what? Every 7405 on the panel is screwed.. 2 functional gates out of
30.. I'm getting very close to shotgunning the entire IC complement on the
panel.
You might be better off using 7406s instead of 7405--better output
current rating.
As far as the 8800 front panel, be wary of the 74Lxx ICs--I seem to
recall that I once tried a straight 74LSxx substitution and it didn't
work. I don't recall why.
--Chuck