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Table of Contents
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Summary of Contents for Spectral Audio neptune
- Page 1 Neptune Service Manual...
- Page 2 Contents 1 General Note..................................3 2 Manual Changes................................3 2.1 Having pulse-width modulation (PWM) for the rectangular wave on OSC1..OSC3..........3 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 3 Assembly plan Analogue Print............................5 4 Assembly plan Digital Print...............................6 5 Adjustment..................................6 5.1 Adjustment of 12.000 V Supply..........................6...
- Page 3 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 remove U01 pin 13 from Ground (it's connected on both side of pcb, so you have to heat up the pin with the solder gun and pull the pin out) 2.1.2 OSC2...
- Page 4 2.5.4 Distorter The filter output is directly connected to the distorter/fuzzer selection input. Remove pin 8 from U07 from the solder pad (leave it in the air and connect R105 to it). The remaining pad is now the input for the distorter/fuzzer selection.
- Page 6 4 Assembly plan Digital Print 5 Adjustment Keep the following sequence. 5.1 Adjustment of 12.000 V Supply Connect a precise DVM to C12 and Ground (i.e. from a potentiometer mounting pin) and adjust R19 to 12.000V after a warm-up phase of at least 30 minutes. 5.2 CV slope adjustment Connect a precise DVM to the output jack of CV.
- Page 7 5.4 Osc 2 Same as above but with R020 as offset, R026 as oscillator slope and R039 as nonlinearity correction. Do it first with Oct switch in 16' pos and correct later the Nonlinearity pot with Oct switch in the highest position until no beats are hear able to Osc 1.
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