Odp: [sdiy] crazy CMOS behavior

[Roman]

probably your CMOS inverter is oscillating because it is driven with
too slow transients. RC network driving transistor will cause such
slow changes. You can use smaller cap, or better - schmit gate
40106, or 4006, can't remember the name.

Roman

----- Original Message ----- 
From: mark verbos <a0284520 at addcom.de>
To: synth DIY <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, October 02, 2002 7:30 PM
Subject: [sdiy] crazy CMOS behavior


> I have built a sequencer based on the 4516 counter. The clock input is 
> stolen from the Serge TKB schematic that is on music machines. That is, 
> trough a cap to an NPN then a CMOS inverter then to the counter. When I 
> clock it, with anything, it jumps all over the place with no real sense 
> or pattern. Could this be related to the step length not being right? 
> How does it work for the actual Serge? It's not the chips, I have 
> switched them all out and it does the same tihng. Am I just missing 
> something not grounded or something?
> 
> thanks for any ideas, I'm going nuts here.
> 
> mark
>