Lower resistances between the op-amp pins would not help. It's a measure to speed up the transition time. Try a different TL072. "End of life" for chips means they aren't making them any more. The chip itself is still viable. Add another 100n directly across the 4015's power pins too. Maybe that will help.
On Sat, Jun 20, 2015 at 3:29 AM, neil.a.Baldwin@... [cgs_synth] <cgs_synth@yahoogroups.com> wrote:If you can I'd definitely try more 4015s. I had a terrible time with them recently when building a Rollz-5. The problem I had was one or more of the gates not closing down properly and allowing signal to bleed through. I tried 4 different ones before landing one that worked properly.Hi again Ken and Richard,
Thanks for your help.I've tried placing a 2M trimmer between legs 5 and 7 of that particular 072, but without results until rsistance too low locked up the 072 - I may try one from a different manufacturer, since I'm getting a slightly different set of patterns that hold, I gained a 01101100 aside from the previous mentioned conditions. I notice that it is between steps 5 and 6 that when there is typically a space (101), it disappears (110) at that position.The CD4015 I had is from texas instruments, though said to be at the end of it's life cycle, should I try one from a newer batch?
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