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GMSN VCO problem(original smd version without the sine wave)
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author GMSN VCO problem(original smd version without the sine wave)
CoreInside
Hi, my GMSN vco has a problem. Everything works but the PWM range knob only works from 11 o clock to 1 o clock. I've tried calibrating it but that doesn't help. Is there anyone here who could take a look at it and explain where I went wrong? I can pay money. I'm in the UK. Thanks.
CoreInside
Can pay 100 gbp for a solution
BugBrand
Is there a schematic?
Such a range would suggest that the summing of any Pulse Width and PWM sources is off by a certain factor - eg. possibly a wrong resistor such as 1M instead of 100k.
Or low amplitude of whatever waveform is used for the PW section.
CoreInside
http://www.mediafire.com/file/at419yrm014h31m/vco.rar/file

the vco schematic, bom, and pcb layout is here
lasesentaysiete
I am looking at this VCO on the oscilloscope. The VCO core's amplitude is frequency dependent--the amplitude increases as the frequency knob is turned clockwise. At a lower frequency setting, the VCO has little or no output.

Does anyone know what may be causing this?
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