Shruthi SMR4-MkII Programmer Filter Issue

Discontinued products Shruthi
#1

After playing today with my Shruthi Programmer I noticed that the Filter does not self-oscillate anymore.

It worked fine before the Programmer transformation and I am wondering what could it be that prevents it´s self oscillation.

My Programmer is Frank´s kit that includes the toggle switches for all of the Filter´s modes (+1,+3 and 2pole-4pole).

Any ideas/theories before I have to open and sort all the spaghetti mess? I have been quite lazy lately and left the issue unresolved, especially after the soldering inferno of all the pots´wiring, but have decided to see what you guys would make of it before tackling blindly the issue.

#2

It could just be that your pot for the Resonance is not calibrated properly. Try turning the resonance all the way up with the rotary encoder before doing anything drastic.

#3

Is the filter board setting correctly set to LPF?

#4

Make sure none of the wires from the smr4 board to the ftontpanel are touching each other. When I built my programmer I didn’t check my writing very thoroughly and some of the smr4 wires were touching, making the resonance working improperly.

#5

Besides checking for the Filter setting there isnt much you can do from the outside…