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paper_synth:ps411_envamp [2017/04/18 18:52] admin [PS411 EnvAmp (Attack/Release Envelope Generator & Opto-VCA)] |
paper_synth:ps411_envamp [2017/04/18 22:03] admin [Schematic] |
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| Vactrol based Opto-VCA add an Attack and Release time automatically due to the relatively slow turn on, and off times of the led-ldr pair inside a vactrol. The ”opto” part of our VCA is a fast and accurate AC-Optocoupler, which adds a tiny bit of Attack time and Release tail to the signal, but not so much as a Vactrol would. We Decided to go with the optocoupler since factory made Vactrols are getting more rare and expensive, and altho rolling your own is a good choice, the response varies due to led and ldr types and manufacture tolerances. | Vactrol based Opto-VCA add an Attack and Release time automatically due to the relatively slow turn on, and off times of the led-ldr pair inside a vactrol. The ”opto” part of our VCA is a fast and accurate AC-Optocoupler, which adds a tiny bit of Attack time and Release tail to the signal, but not so much as a Vactrol would. We Decided to go with the optocoupler since factory made Vactrols are getting more rare and expensive, and altho rolling your own is a good choice, the response varies due to led and ldr types and manufacture tolerances. | ||
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| The Paper Synthesizer PS411 adds more control to the opto-VCA with Attack and Release control potentiometers. If both turned to zero, the module acts like a normal VCA, controlled by external CV. | The Paper Synthesizer PS411 adds more control to the opto-VCA with Attack and Release control potentiometers. If both turned to zero, the module acts like a normal VCA, controlled by external CV. | ||
| If Attack or Release are adjusted, it affects the input CV before it controls the VCA. If CV input is a Gate signal, the envelope generator works like a normal Attack Release generator. Created envelope can be used to also control other modules view envelope output connector. A led is used to visualize the envelope. A jumper in the board selects between long and short attack and release ranges. | If Attack or Release are adjusted, it affects the input CV before it controls the VCA. If CV input is a Gate signal, the envelope generator works like a normal Attack Release generator. Created envelope can be used to also control other modules view envelope output connector. A led is used to visualize the envelope. A jumper in the board selects between long and short attack and release ranges. | ||
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| The module comes also with an bipolar offset potentiometer for manually controlling the amplitude. | The module comes also with an bipolar offset potentiometer for manually controlling the amplitude. | ||
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| + | ====Scope==== | ||
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| ==== Schematic ==== | ==== Schematic ==== | ||
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