Contents General Note............................. 2 Manual Changes............................2 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 OSC3/LFO sync with OSC1 or OSC2 ....................3 Even faster envelopes ........................3 Increase the tuning range for OSC1..OSC3 ..................
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.
The square Pad is now the DC Signal input for PWM. It ranges from –3.8V to 2.3V for 0% to 100%PWM or you if want to use the range 50% to 100% (the 0% to 50% do sound exactly the same), -0.75V to 2.3V. 2.2 OSC3/LFO sync with OSC1 or OSC2 For this, connect a 470pF capacitor (it may be ceramic) from TP19 (OSC1 out) or TP45 (OSC2 out) to TP46 (you may want to use a switch).
2.5.4 Distorter The filter output is directly connected to the distorter/fuzzer selection input. Remove pin 14 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.
4 Assembly plan Digital Print 5 Adjustment Keep the following sequence. 5.1 Adjustment of 12.000 V Supply Connect a precise DVM to R031 and Ground (i.e. casing of octave select switch Osc2) and adjust TR501 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.
5.5 Osc 3 Same as above but with TR07 as offset, TR08 as oscillator slope and TR09 as Nonlinearity correction. Do it first with Oct switch in 32' pos. Now all frequencies are half the value of the above. 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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