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paper_synth:ps411_envamp [2017/04/18 18:51] admin [Paper PCB] |
paper_synth:ps411_envamp [2020/02/14 18:30] admin |
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- | =====PS411 EnvAmp (Attack/Release Envelope Generator & Opto-VCA)===== | + | ===== PS411 EnvAmp (Attack/Release Envelope Generator & Opto-VCA)===== |
The Dynamics of synthesized sounds are controlled with a Voltage Controlled Amplifier, or VCA. | The Dynamics of synthesized sounds are controlled with a Voltage Controlled Amplifier, or VCA. | ||
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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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+ | <html> | ||
+ | <iframe width="600" height="338" src="https://www.youtube.com/embed/pwurOpNAjtI?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe> | ||
+ | </html> | ||
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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- | {{:paper_synth:ps411_scope_pic.jpg?600|}}\\ | ||
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. | ||
- | {{:paper_synth:ps411_print_201126_1200.jpg?600|}}\\ | + | ---- |
+ | ====Scope==== | ||
+ | {{:paper_synth:ps411_scope_pic.jpg?400|}}\\ | ||
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==== Schematic ==== | ==== Schematic ==== | ||
- | {{:paper_synth:ps411-origami_envamp_1200.jpg?600|}}\\ | + | {{:paper_synth:ps411-origami_envamp_1200.jpg?400|}}\\ |
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- | ~~socialite:icon facebook twitter googleplus reddit tumblr~~ | + | ==== License ==== |
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+ | The PS411 EnvAmp was designed by **Antti Pussinen** 2017.\\ | ||
+ | It is licensed under a [[http://creativecommons.org/licenses/by-nc-sa/4.0/"|Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License]]. | ||
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+ | <html> | ||
+ | <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a> | ||
+ | </html> | ||
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