[sdiy] Troubleshooting the Morph-Lag

[Scott Juskiw]

I had a problem with ringing when the shape knob was set to 100% linear. Adding a resistor to ground at the linear end of the pot made the problem go away, you may need to do the same. See R3 in the schematic:

http://www.tellun.com/motm/diy/tln862/TLN-862_Schematics.pdf

More info about my build of Harry's circuit:

http://www.tellun.com/motm/diy/tln862/TLN-862.html



On 2011-05-23, at 3:09 PM, appliancide wrote:

> Hello All,
> 
> I built this circuit to use for as part of a demonstration at my job, and I have run into a little problem. Certain settings of the "shape" knob (close to fully linear I believe) are causing the CV out to hit the positive rail. I am using a TI TL072IN if it makes a difference. 
> 
> Has anyone ever experienced that with this circuit? I found some suggestions from David Dixon in the archives and I may try those to see if the problem goes away, but I wanted to rule any other possible causes out first.
> 
> One of my coworkers made the suggestion that the shape potentiometer could be bad. Sound plausible?
> 
> Also...is there an "academic" write up of this circuit (or one that is similar) available anywhere? 
>