[time-nuts] RS-232 Pin Outs for the Acron Zeit WWVB LCD Clock
hmurray at megapathdsl.net
Mon Jul 24 13:02:42 EDT 2017
[Correcting my earlier comment.]
> You could probably add a diode to make it work.
It takes more than just a diode.
The voltage on the modem control signals is probably too high. You will also
need some way to drop it to what the chip expects, probably 5 volts. Simple
3 pin regulators need input and output caps. There is probably one already
on the output side.
The just-a-diode from a message early in this thread works because the LM358
op-amp can take a higher supply voltage.
These are my opinions. I hate spam.
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