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paper_synth:ps411_envamp [2017/04/18 18:23]
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paper_synth:ps411_envamp [2020/06/11 22:13] (current)
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-=====PS411 EnvAmp (Attack/​Release Envelope Generator & Opto-VCA)=====+===== PS411 EnvAmp (Attack/​Release Envelope Generator & Opto-VCA)===== 
 +by Antti Pussinen\\
  
 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.
 In a classical subtractive synthesizer arrangement the VCA is controlled through an  envelope generator, allowing more interesting dynamic possibilities than just the on/off of a note gate.  In a classical subtractive synthesizer arrangement the VCA is controlled through an  envelope generator, allowing more interesting dynamic possibilities than just the on/off of a note gate. 
  
-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. ​+{{:​paper_synth:​ps411_envamp_1200_3999.jpg?​600|}}\\ 
 + 
 +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. 
 + 
 +<​html>​ 
 +<iframe width="​600"​ height="​338"​ src="​https://​www.youtube.com/​embed/​pwurOpNAjtI?​rel=0&​amp;​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. 
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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.
 +
 +----
 +====Scope====
 +{{:​paper_synth:​ps411_scope_pic.jpg?​400|}}\\
 +
 +----
 +==== Schematic ====
 +{{:​paper_synth:​ps411-origami_envamp_1200.jpg?​400|}}\\
 +
 +----
 +==== Paper PCB ====
 +{{:​paper_synth:​ps411_envamp_10.jpg?​400|}}\\
 +{{ :​paper_synth:​ps411_envamp_10.zip|}}\\
 +
 +----
 +==== Faceplate ====
 +{{:​paper_synth:​ps411_envamp_faceplate_11.jpg?​200|}}\\
 +
 +----
 +==== Parts ====
 +  * **Resistors:​**
 +  * 1x 68 Ohm
 +  * 1x 100 Ohm
 +  * 3x 1 kOhm
 +  * 2x 10 kOhm
 +  * 1x 1.5 kOhm
 +  * 1x 5.6kOhm
 +  * 5x 100 kOhm
 +  * 2x 470kOhm
 +  * **Capacitors:​**
 +  * 1x 22µF (bipolar)
 +  * **Diodes:**
 +  * 5x 1N4148
 +  * 1x LED
 +  * **Semiconductors**
 +  * 1x TL072 OpAmp
 +  * 1x TL074 OpAmp
 +  * 1x H11F1 Optocoupler
 +  * **Mechanical:​**
 +  * 1x IC socket, 8pins
 +  * 1x IC socket, 16pins
 +  * 1x IC socket, 6pins
 +  * 4x Thonkiconn 3.5mm jack socket
 +  * 1x pin strip 2x8
 +  * **Trimmpotentiometer:​**
 +  * 1x 50 k
 +  * **Potentiometers:​**
 +  * 2x 100k lin
 +  * 1x 100k log
 +
 +----
 +==== License ====
 +
 +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]].
 +
 +<​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>​
 +
 +----
 +
 +
 +
 +