On Samstag, 12. Dezember 2020 14:40:11 CET Bob kb8tq wrote: > Hi > > If you are going to drive much with the timepulse output, you will need to > buffer it. This is true for just about any practical length of coax. It also > applies to other cables once they get past the “few inches” range. > > Ideally the coax buffer would be something like 4 or so ‘125 buffers in > parallel, each with a 200 ohm resistor in series with their output. Is it > going to put out 3.3V or 5V logic? ….
A HCT125 should have 3.3V logic compatible inputs and TTL outputs. There are nice dual-instance buffers available, 74AHCT2G125 for example. But this is not "breakout board" material any more. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
