01-01-2012, 07:58 PM
Tony,
I quote from David's first link above:-
'There will be minor internal circuitry differences between 555 timer IC's from the various manufacturers but they all should be usable for the circuits on this page.'
Now try going along to the Production Manager and telling him that he'll have to install a couple of pots or turrets for SOTs so they can be set up.
Then go along to the Purchasing Manager and tell him that he'll have to buy Texas chips 'cause they're the only ones that are guaranteed to work, but watch the date codes.
Next go along to Test Dept and tell them to keep checking that the pots or SOTs are in reasonable range - not on the end stops - that the correct Manufacturer's chips have been used and that the output waveforms are good. You'll have put all that in the Test Spec.
Finally, call in the Personnel Department on your way out and collect your P45.
OK, that's a bit of an exaggeration, and you could probably get away with using them if it's a short life low volume Domestic product. They're also OK for one-offs 'cause you automatically make the circuit work with the chips you have. But when it comes to long life or high volume designs they're just not on.
Alan
I quote from David's first link above:-
'There will be minor internal circuitry differences between 555 timer IC's from the various manufacturers but they all should be usable for the circuits on this page.'
Now try going along to the Production Manager and telling him that he'll have to install a couple of pots or turrets for SOTs so they can be set up.
Then go along to the Purchasing Manager and tell him that he'll have to buy Texas chips 'cause they're the only ones that are guaranteed to work, but watch the date codes.
Next go along to Test Dept and tell them to keep checking that the pots or SOTs are in reasonable range - not on the end stops - that the correct Manufacturer's chips have been used and that the output waveforms are good. You'll have put all that in the Test Spec.
Finally, call in the Personnel Department on your way out and collect your P45.
OK, that's a bit of an exaggeration, and you could probably get away with using them if it's a short life low volume Domestic product. They're also OK for one-offs 'cause you automatically make the circuit work with the chips you have. But when it comes to long life or high volume designs they're just not on.
Alan
