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Subject: Re: How to get CMOS counter to drive a relay?
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Thu, 17 Oct 2002 02:53:47 GMT
NNTP-Posting-Date: Wed, 16 Oct 2002 22:53:47 EDT
Organization: Cox Communications
I agree -- the simplest method of driving small coils with logic is a logic
level MOSFET. Maybe not the cheapest method, but is definitely an easy
method. Just look at what the pinball people did. Lots of coils. Early on
they used transistor pairs to drive these. Some of the latter ones evolved
to simple MOSFETs and the reliability increased tremendously.
wrote in message
> Fred Bloggs wrote:
> > John Fields wrote:
> > > ---
> > > That 360µA output at 125°C is _worst case_ from -55 to 125C, so the
> > > chip will _always_ be able to source more than that from -40 to 85C.
> > > Try reading a spec sheet before you start spouting false
> > > pronouncements. You're right about the the margin, but for greater
> > > detail I usually get paid.
> > > ---
> > >
> > Your reasoning is naive. It appears that you know nothing about parts
> > cost, avoiding dependence on a single high-beta part, relay coil
> > parameter change with temperature, age, and manufacturing tolerance,
> > variation of component parameters across manufacturers and time, and
> > testing limits on "guaranteed" performance parameters and implications
> > for your QC. As for paying you, no thanks, I would rather flip a coin. I
> > would consider paying you to work for the competition however;-)
> You are way out of line, here.
> And you missed the point with your original post.
> The OP asked:
> "What's the SIMPLEST method to get a Fairchild CD4020/40/60
> counter to drive a relay with one of its Qx outputs?"
> (Emphasis mine)
> The SIMPLEST is NOT a 2 transistor circuit.
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