I took the Circuitbenders Sh 101 Mod Pdf and followed it through to every detail.
After assembling the synth im having some troubles.
The filter input works , switching to Fm input works as well.
The Lfo Speed Mod Works.
Overdrive Works.
CV control input works.
Cant really tell with the PWM Source selector, FM Mods.
The reason i cant tell with the PWM+Fm is tha fact that after assembling i seem to have lost the VCO.
I can make the filter self oscillate and track the keyboard so i know the keyboard works.
I dont think the VCO is dead , Im just getting no output from the oscillator.
I can hear the vco's working on the FM mod , just slightly , enough to know it isnt dead
Im tempted to think that It might have something to do with either the PWM or the fm Mod as those are the ones that draw from the oscillator?
I could also have messed up the output from the vco's when inserting the Audio input but i doubt it .
So....My question is .
Has anyone done this mod ? Is there a known error in the PDF?
If not , care to take a guess as to what might have gone wrong?
My next step would be to desolder the PWM first and then the Fm mod but id rather not if someone has an idea.
Thanks
Arnar
ps. I love the filter input mod as well as the overdrive and LFo speed mod, those alone are worth the effort.
pps. If you are thinking about doing the mod then its pretty easy ( apart from my troubles) .
BUT.....im having a bit of trouble with mounting the keyboard as the Switches dont allow all the clearance i need so try and find the shallowest switches and pots you can find . The small pots are no problem but the switch and rotary pots are hard to fit.
My fix for that is lowering the keyboard with washers.