LM13600 Spec Sheet VCO questions

Scott Gravenhorst, Synthaholic chordman at ix.netcom.com
Thu Sep 28 22:28:57 CET 1995

I have a copy of the LM13600 OTA spec sheet.  On page 2-527, ther ar 
two VCo circuits, fig:15 = triangle and square, and fig:16 = ramp and 

The math for fig 15 shows the output frequency is linear with respect 
to the control current.  Fig 16 shows the frequency of oscillation as 
'approximately' equal to some calculation involving the control 

1) Has anyone any experience with these circuits?  Like are they 

2) Does the 'approx' operator instead of an equal sign indicate some 
non-linearity or just some leeway, but that linearity is preserved?

-- Scott G., Synthaholic

There is no 12 step program for synthaholics.  Thank your Superior Being.

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