As an electronics experimenter who is blind, I write down the
pin-outs of chips I am working with in Braille in a notebook.
Sometimes, I forget to write down crucial details that I just know
I'll remember as well as I do my name, but my brain sometimes doesn't
remember as well as I'd like.
Are the Control lines for the 4 bilateral switches of a CD4016
or a CD4066 active low or active high?
I am going to be running one or two of these chips from a PIC,
actually, via a 7405 open collector hex inverter to shift levels from
+5V to +12v where the bilateral switches can switch a larger voltage
range. The neat thing about the PIC is that I will just write the
firmware to fit the polarity requirements.
Those who have ever switched audio with a CD4016 or 66 know
that when the switch is open, voltages that exceed VDD/2 will slip
through anyway. With 12 volts, this raises the breakdown threshold to
+-6 volts rather than +-2.5 volts.
Martin McCormick WB5AGZ Stillwater, OK
OSU Information Technology Division Network Operations Group
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Author: Martin McCormick
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Fat City Network Services -- 858-538-5051 http://www.fatcity.com
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