RANDOM*SOURCE
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5
Serge RING
Calibration
Feed a 5V pp signal into SIGNAL (e.g. Triangle or SAW from a DSG) and another 5V pp signal into CARRIER.
The SIGNAL should be in the audio range, but not too fast, as waveforms may change otherwise, 1-2 kHz
should do it. The signal into CARRIER should be slower, for instance around 50 Hz. Turn both attenuators fully
CW.
Use a scope to see both the CARRIER signal as well as the OUTPUT
(using either output - they are
identical).
(A) Set MODE fully CW and adjust the three trimmers so that
the OUTPUT has no DC offset and shows a nice
symmetry like this:
You will notice that this is an iterative process - the top trimmer controls the vertical (DC) offset, however, the
other two trimmers kind of act like a joystick, shifting the balance of the output waveform. Don’t expect to get
a perfect result at once! Also, vary the frequencies of the incoming signals to see if there are any changes in the
waveforms of the incoming signals. The bottom trimmer kind of tilts / rotates the waveform - this is where you
should (carefully start). You will most likely have to revisit the DC offset trimmer after changing the others. Try a
different waveform for CARRIER, too. Here’s the SINE OUT of a Serge NTO:
