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paper_synth:ps411_envamp [2017/04/18 22:03] admin [Schematic] |
paper_synth:ps411_envamp [2020/06/11 22:13] |
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| - | =====PS411 EnvAmp (Attack/Release Envelope Generator & Opto-VCA)===== | ||
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| - | 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. | ||
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| - | {{:paper_synth:ps411_envamp_1200_3999.jpg?600|}}\\ | ||
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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. | ||
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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> | ||
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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. | ||
| - | 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. | ||
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| - | ====Scope==== | ||
| - | {{:paper_synth:ps411_scope_pic.jpg?400|}}\\ | ||
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| - | ==== Schematic ==== | ||
| - | {{:paper_synth:ps411-origami_envamp_1200.jpg?400|}}\\ | ||
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| - | ==== Paper PCB ==== | ||
| - | {{:paper_synth:ps411_envamp_10.jpg?400|}}\\ | ||
| - | {{ :paper_synth:ps411_envamp_10.zip|}}\\ | ||
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| - | ==== Faceplate ==== | ||
| - | {{:paper_synth:ps411_envamp_faceplate_11.jpg?200|}}\\ | ||
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| - | ==== 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 | ||
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| - | ~~socialite:icon facebook twitter googleplus reddit tumblr~~ | ||
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