According to Bob Blick on Wed, 01/23/13 at 11:35: > > My hunch is that the circuit relies on the batteries being very local, > and the wire length to the power supply is causing instability. You > could test the hypothesis by putting batteries on as long a cord as the > power supply and see if you get similar results. >=20 > In that case, the fix would be to put a small bypass cap where the > batteries should be. Now that suggestion is one for the books! :-) We are not talking radio transmission here! Nor is this a high tech display. Maybe you are talking about digital logic being sensitive to spikes caused by whatever. I could easly put a bypass capacitor in the power leads. I'm guessing that would have to go as close to the plastic "power pack" as possible. It is worth trying this after I try some of the other suggestions. Thanks! Everyone's responses have been so very helpful! :-) Regards, web... --=20 William Bulley Email: web@umich.edu 72 characters width template ----------------------------------------->| --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .