Spectral Audio Neptune 2 Service Manual
Service Manual
3DJH
Contents
1 General Note............................................................................................................................................. 2
2 Manual Changes....................................................................................................................................... 2
2.1 Having pulse-width modulation (PWM) for the rectangular wave on OSC1..OSC3 .......................... 2
2.1.1 OSC1.......................................................................................................................................... 2
2.1.2 OSC2.......................................................................................................................................... 2
2.1.3 OSC3.......................................................................................................................................... 2
2.2 OSC3/LFO sync with OSC1 or OSC2 ...............................................................................................3
2.3 Even faster envelopes ....................................................................................................................... 3
2.4 Increase the tuning range for OSC1..OSC3 ...................................................................................... 3
2.5 General in/outputs .............................................................................................................................3
2.5.1 Oscillators................................................................................................................................... 3
2.5.2 Envelopes................................................................................................................................... 3
2.5.3 Filter............................................................................................................................................ 3
2.5.4 Distorter...................................................................................................................................... 4
2.5.5 VCA ............................................................................................................................................ 4
3 Assembly plan Analogue Print (see also separate .gif file at the homepage)........................................... 5
4 Assembly plan Digital Print .......................................................................................................................6
5 Adjustment................................................................................................................................................ 6
5.1 Adjustment of 12.000 V Supply ......................................................................................................... 6
5.2 CV slope adjustment .........................................................................................................................6
5.3 Osc1 .................................................................................................................................................. 6
5.4 Osc 2 .................................................................................................................................................6
5.5 Osc 3 .................................................................................................................................................7
5.6 Filter................................................................................................................................................... 7
5.7 Noise generator ................................................................................................................................. 7
3DJH
1 General Note
Fully schematic is not supported by this manual. If you think you really need to receive it, please write to
spectralaudio@swissonline.ch .
2 Manual Changes
2.1 Having pulse-width modulation (PWM) for the rectangular wave on
OSC1..OSC3
2.1.1 OSC1
Open B1 with a sharp cutter.
2.1.2 OSC2
Open B2 with a sharp cutter.
Pictures shows Backside of the PCB.
2.1.3 OSC3
Open B3 with a sharp cutter.
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