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CGS Serge dual universal slope generator (view source)
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If the TRIG IN jack is connected to the TRIG OUT jack, the DSG will oscillate with a waveform and frequency set by the RISE and FALL knobs. A series of pulses will appear at the TRIG OUT jack, and the duty cycle (the time the pulse is high compared to when it is low in each cycle) is set by the RISE and FALL knobs. The FALL knob determine how long the pulse is low. When the DSG is in the RISE part of the cycle or when the output is zero or less, the output of the TRIG OUT will be high. In some applications, a pulse with a very long duty cycle will cause erratic triggering in other modules. If such a symptom occurs, try increasing the FALL time and decreasing the RISE time to get the same pulse rate.
The DSG may be used as a positive peak follower by setting the RISE time to minimum (full CW) and applying an audio signal to the IN jack. Adjust the FALL knob for a compromise between response time and the best filtering of the audio component at the DSG output. If the FALL time is turned to minimum, and the RISE knob adjusted for optimum response time and filtering, then the unit will function as an envelope, follower-producing a negative envelope corresponding to the negative peaks
Adjustments on the DSG board are set to obtain a 0 to +5 volt level when the unit is cycling, producing a 100Hz triangle wave. An oscilloscope is required for this adjustment. This should not need to be adjusted unless components are replaced.
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The DSG may not track as well as the NTO's and PCO's when used as an oscillator.
Remove the patch from the END and TRIG IN jacks, and apply a control voltage from a keyboard, Stopped Function, or
The DSG can be used as a simple envelope generator, a low frequency oscillator, pulse generator, or in a variety of other applications. As an envelope generator, the unit can be triggered in two different ways:
1. Connect a trigger pulse to the TRIG IN jack. When a pulse is applied here, an envelope defined by the RISE and FALL knobs will be produced which goes from 0 to +5 volts. If a second trigger is received before the envelope has finished, it will not re-initiate the envelope. Using a pulse train into this input, the DSG can be used as a frequency divider, or sub-harmonic generator. A
If the envelope time is slightly longer than the pulse period, then the DSG
2. With a gate signal into the IN jack, an envelope will be produced which begins to rise at a rate set by the RISE knob to a level equal to the gate level. The level will remain at this level as long as the gate is present: an envelope with sustain.
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If the TRIG IN jack is connected to the TRIG OUT jack, the DSG will oscillate with a waveform and frequency set by the RISE and FALL knobs. A series of pulses will appear at the TRIG OUT jack, and the duty cycle (the time the pulse is high compared to when it is low in each cycle) is set by the RISE and FALL knobs. The FALL knob determine how long the pulse is low. When the DSG is in the RISE part of the cycle or when the output is zero or less, the output of the TRIG OUT will be high. In some applications, a pulse with a very long duty cycle will cause erratic triggering in other modules. If such a symptom occurs, try increasing the FALL time and decreasing the RISE time to get the same pulse rate.
The DSG may be used as a positive peak follower by setting the RISE time to minimum (full CW) and applying an audio signal to the IN jack. Adjust the FALL knob for a compromise between response time and the best filtering of the audio component at the DSG output. If the FALL time is turned to minimum, and the RISE knob adjusted for optimum response time and filtering, then the unit will function as an envelope, follower-producing a negative envelope corresponding to the negative peaks
Adjustments on the DSG board are set to obtain a 0 to +5 volt level when the unit is cycling, producing a 100Hz triangle wave. An oscilloscope is required for this adjustment. This should not need to be adjusted unless components are replaced.
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== Extra notes for the CGS114 adaptation of the DUSG/DTG PCB ==
[[File:cgs_schem_cgs114_dusg.gif|thumb|center|894px|The schematic of one section of the DUSG.]]
Both units on this board have identical
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