On Wed, 25 Apr 2012 11:13:42 -0700, Chris Albertson <albertson.ch...@gmail.com> wrote:
>On Wed, Apr 25, 2012 at 9:37 AM, Don Latham <d...@montana.com> wrote: > >> I forgot to add that a simple redrafting of the II as an Arduino shield >> with appropriate chips and chip passives would accomplish the desired >> end without losing the very careful engineering and testing that has >> already been done? >> Would be nice to have a way to change caps without soldering as well, >> maybe just some .1" jumpers? > >Yes, MOST of the design could be re-used. As an Arduino shield there is no >need for a PIC or RS-232 interface becusethe Arduino does that function. > You'd need to replace the 74ACT175 part but that is not hard. > >About changing the cap values without soldering. I guess you could push >the leads into a 0.1 inch header strip or install several and use a DIP >switch to select which are "in". But I don't know if the extra inductance >al that wiring adds is enough to worry about. One problem with the design in this case is that it requires 8 or 9 I/O pins making the use of additional Arduino shields difficult. Would you add tri-state buffering and a chip select? _______________________________________________ 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.