Problem Calibrating Penrose

edited October 2015 in Troubleshooting
Hi guys,

I'm having problems calibrating my Penrose. I read the output frequency of my Doepfer A-110-1 with a DSO Nano V2 Oscilloscope (very similar to the one used in your video tutorial) but i've noticed that, turning the screw of the variable resistor, the frequency do not change.

Unfortunately i wrongly connected my unit to the bus the first time but, after that, everything seems to work in the correct way, except for this issue. 

I already checked all the connections of the output circuit and everything seems to be ok.

In addition when using the uncalibrated module, it seems to work perfectly.

Any idea ? Thanks. 
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