[sdiy] vco wave shap problem

[Jim Bob]

Here's the schemo
  
  http://www.cgs.synth.net/modules/pic/schem_cgs48_vco.gif
  
  http://www.cgs.synth.net/modules/cgs48_vco.html
  
  I have the scope going directly to the ramp output of the VCO
  
  Rykhaard,
  Yes, only the top is flat
  
  The scope is displaying AC.  Its not a very good scope, so Im not  sure how much I will be able to tell about offset..  I will poke  around some more.
  
  Everything else works perfectly.  The square out seems to be ok,  too.  Again, dont know about offset, but the shape is good.   The osc is tuned perfectly,  too..  So that part is working.
  
  I tested another VCO I have (a paia vco) and it is fine, so I think Im using the scope correctly.
  
  Thanks
  
  
  

Bob Weigel <sounddoctorin at imt.net> wrote:  Well I'm not familiar withthe CGS circuit...but it would seem you are 
clipping the signal somewhere.  There is too much drive possibly coming 
into an amplifier. Where is  a schemo of it? -Bob

Jim Bob wrote:

> I finally got a working scope today and was checking out my VCO's.  
> The ramp out of my CGS VCO is not right.  instead of a ramp shape 
> /|/|/|/| I get |-\|-\|-\.  Sorry, thats the best I can do, but its 
> supposed to show a wave going stright up, has a flat top, and then a 
> down ramp.  The flat top is fairly long, too.
> Anyone know what could be causing this?
>
> Thanks
>
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