[sdiy] Jürgen Haible living VCO core

[Liam Wall]

Hello,

I have two questions on the saw core in the JH Living VCO design, if anyone
can help.

1. Resistors R17/R18 in series with the capacitor on the integrator: R18 is
marked as being a trimmer for high frequency tracking. Any idea how that
works? My guess is it prevents the op-amp output resetting all the way to
zero, and more so at higher frequency, and thus a shorter journey back up
to the trigger point of the comparitor. So it counteracts the tendency to
flat at higher frequency by reducing the amplitude --- is this right?

2. What is the purpose of D15?

See: http://jhaible.com/legacy/living_vcos/living_vcos_sch_1of4.pdf

Linked from:
http://jhaible.com/legacy/living_vcos/jh_living_vcos.html

Thank, Liam
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