Re: [CAD_CAM_EDM_DRO] Re: Opto / relay recommendation

In a message dated 30-May-02 17:33:54 Central Daylight Time, rab@...
writes:

> There seem to be a few ICs with the same or seemingly very similar
> specs under the ULN2003 code (and the codes Larry mentioned) I'm not
> sure I understand the differences, should they all work for this kind
> of task anyhow ?

Rab: Some (ULN2003) are for "TTL level input" (they work with an input of
about 2.4 to 5 VDC. Others (ULN2004) are for "12 V CMOS levels", say, 10 to
15 V input. I do not have the "specs" at hand, but that's close.

Another - the ULN2001, if I'm not mistaken? - has NO "base resistors", just
the Darlingtons and rev. EMF diodes. With that one, you have to "do your OWN
base-resistors "outside" the DIP.

It is only the INPUTS that differ in these "ULN200n" series. The "last
digit" denotes the kind of INPUT to the bases of the 7 Darlingtons.

I think someone said try the T.I. (Texas Instrument) site, and look up the
data-sheets for the ULN- series. I never did that, but I have done other
similar stuff, so it shouldn't be difficult at all. It is mind-bending what
DATA one can find on-line! GO for it!

Lotsa luck! Jan Rowland


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