-=> George White said to Greg Mayman
 -=> about "BAG OF CHIPS" on 02-12-04  00:46.....

 GW> Pain, fortunately I didn't come across that...

Fortunately neither did I in practice!

 GW> What I did hear of was the LOP switching transistor that caused one
 GW> manufacturers TV sets to go up in smoke. The developers used one
 GW> manufacturer, the factory purchasing got a better(?) deal from another
 GW> company. Unfortunately the secondary characteristics were not the
 GW> same, and not good enough, so Poof!, the set went up in smoke...
 GW> We approved both the device _and_ the suppliers. Puchasing could
 GW> not use an unapproved supplier...

I remember a similar thing where the production spread of some
switching FETs threw us out.

We were using several hundred in a project where they were
switched by TTL logic. The data sheet showed a cutoff voltage
spread between 2 and 5 volts, but the first lot we bought had
them all switching right at the top of that range.

We had to purchase several THOUSAND and hand select the ones that
would work.

Fortunately the local supplier agreed to take back the ones that
didn't meet our needs, but he sold them all back to us when we
wanted some more....

   ,-./\
  /     \ From Greg Mayman, in beautiful Adelaide, South Australia
  \_,-*_/    "Queen City of The South"    34:55 S  138:36 E
       v

... Always willing to share my ignorance...
___ Blue Wave/386 v2.30

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