Best way to toast TTL
grant at stockly.com
Sat Sep 1 20:29:49 CDT 2007
Before I write to the group, Kurt Klemm, if you read this please try
sending me a message on my web forum at http://www.stockly.com I am
getting your e-mails but based on them it sounds like you are not
getting mine! : (
--- Now to the rest:
I'm wishing I've kept all the broken TTL chips over the years...
I am evaluating a TOP2004 programmer for testing TTL chips. I bought
it off of ebay from
bought it on ebay because the price was cheaper. They are located in
Canada and it took 5 days to get shipped to Alaska. Very well
packed. The other TOP programmers ship from china/japan.
I want to be able to recommend a TTL tester to my customers of the
Kenbak kit. With 132 74xx TTL chips it would really come in handy!
So far I think it does a good job. If I lift a signal leg on a
74LS04 it both can't auto detect anything and will report a 7404 as
bad. I only have one known bad part, a 74LS376. It DID report it as
bad and undetectable.
What I'm wondering is if anyone knows how I can prematurely kill a
TTL device or simulate static failure. I'd like to try to test how
thoroughly the programmer tests the chips. It can't tell the
difference between a 7410 and 7412, but that isn't too important for
knowing the chip works (mostly)
On a second note, I have successfully over clocked my Kenbak
500%. Its running happily at 5MHz. : ) Although it gets a lot
hotter! I need heat sinks...
--I suppose giving one 12v to simulate hooking up a power supply wrong?
--Hooking 12v to a device normally powered at 5v?
--Shorting out a buffer output? (I think some buffers are designed
to be shorted out though)
--Vehicle ignition coil to an input? : D
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