[sdiy] Improvements to yusynth VCO

[yves usson]

Hi
I have made some important improvements to my yusynth VCO in order to 
improve the HI-TRACK linearity and the PWM circuit.
This is a major update : new value for the core capacitor C8 which is 
now 220pF 1% stiroflex or silver mica (was 1nf before), suppression of 
the HI-Track trimmer and addition of a diode and 1M resistor in the expo 
circuit.

In order to facilitate these changes and addition I designed new PCBs. 
For those of you who have built the circuit with the old version (prior 
to august 29th) and don't want to etch a new PCB I have included photos 
that show how to modify the old PCB to integrate these changes.

Cheers
-- 
Yves Usson

http://yusynth.net
yves.usson at yusynth.net