[sdiy] trouble driving cmos from modular signals

[Dan Snazelle]

I ended up getting it working by

First going through a diode, then connecting the anode to +v through a 15k resistor and taking this point out thru a .1uf cap


Thanks all!!!

Sent from my iPhone

On Sep 15, 2012, at 12:45 AM, Colin Hinz <music-lists at primus.ca> wrote:

> On Fri, 14 Sep 2012, Ullrich Peter wrote:
> 
>> Hi!
>> 
>> The problem with the 4017 could be that not the levels are the
>> problem but the signal edges. The 4017 needs fast edges to work
>> properly. Slow rising signals will not work.
>> 
>> So a Schmitt trigger on the clock input could be necessary.
>> Something like a 40106 (Schmitt trigger inverter) - use two if
>> non inverting is needed.
>> 
>> Ciao
>> Peter
> 
> This.
> 
> Edge-driven logic requires, quirkily enough, a nice sharp well-defined
> edge in order to function. Often, the datasheet will be kind enough
> to define what "sharp" means in terms of a risetime parameter.
> 
> - Colin
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>