[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.

Here are front and back pictures. On Mon, Jul 24, 2017 at 1:02 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > [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. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. >