Friday, July 7, 2023

New measurements with JOVE CV generation and working Cell 1 and 2

NB: R_abc is 10k instead of the 18k found in the JOVE circuit.

Resonance

I think the resonance looks quite good

Here are some quick measurements of the resonance voltages using the JOVE resonance circuit. This seems to give approxmiately unity gain for HP/LP and self resonance (could perhaps be a bit better).

Output of trimmer 1: -2.83V
Output of trimmer 2: -10.83V

Reso CV: 0V
Output CV mixer: 2.9V
Base voltage: -52mV

Reso CV: 5V
Output CV mixer: 7.94V
Base voltage: -10mV

Cutoff

The cutoff range seems too limited, but with this, a 50Hz wave has an amplitude of approx 130mVpp. At max, the HP filter lets a 1.5kHz wave through with 180mVpp. An 8k wave has approx 5Vpp amplitude.

Cutoff trimmer 1: -8.4V

Cutoff CV 0:
Output CV mixer: 998mV
Base voltage: 100mV

Cutoff CV 5:
Output CV mixer: -1.25V
Base voltage: -100mV

Polarities
LP output, Cell 1: inverted
BP output, Cell 1: normal
HP output, Cell 1: inverted

Amplitudes 
HLP Max: +/-5.25V
BP Max: +/-3.5V
HP Max: +/-5.25V

High frequency oscillations
The high frequency oscillations seen previously are completely gone (though I have not tested with higher CV), perhaps they were caused by the erroneous 3p filter cap

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