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paper_synth:ps301_wavefolder [2015/12/19 14:53] admin [PS301 - Diode Wavefolder] |
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| ===== PS301 - Diode Wavefolder ===== | ===== PS301 - Diode Wavefolder ===== | ||
| - | ---- | + | by Antti Pussinen\\ |
| Ps301 Diode Wavefolder is a dynamic waveform processor module, that changes the color and the overtones of a sound, while keeping the same base note. The design is originally Jürgen Haible's take on "Serge Wave Multiplier, middle section". Yves Usson of YuSynth added an exponential VCA to the design, making voltage control possible, and we modified the circuit further to fit our design requirements. | Ps301 Diode Wavefolder is a dynamic waveform processor module, that changes the color and the overtones of a sound, while keeping the same base note. The design is originally Jürgen Haible's take on "Serge Wave Multiplier, middle section". Yves Usson of YuSynth added an exponential VCA to the design, making voltage control possible, and we modified the circuit further to fit our design requirements. | ||
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| ==== Theory of operation ==== | ==== Theory of operation ==== | ||
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| "A string of diodes is driven with the amplified and level shifted input signal. After each diode there is a "tap" with a resistor that will contribute positive or negative to the output of a two-opamp subtracting amplifier. There are two virtual GND nodes for these summing and subtracting operation. By feeding these virtual GND nodes alternately from the taps of the diode string, you can have the output voltage increased when one diode drop voltage is reached, and have the output voltage decreased again when the next diode in row starts conducting. The number of valleys and peaks is only determined by the length of the diode string, and not by the number of opamps. It turned out that choosing equal resistor values results in an almost regular pattern of the voltage transfer function." | "A string of diodes is driven with the amplified and level shifted input signal. After each diode there is a "tap" with a resistor that will contribute positive or negative to the output of a two-opamp subtracting amplifier. There are two virtual GND nodes for these summing and subtracting operation. By feeding these virtual GND nodes alternately from the taps of the diode string, you can have the output voltage increased when one diode drop voltage is reached, and have the output voltage decreased again when the next diode in row starts conducting. The number of valleys and peaks is only determined by the length of the diode string, and not by the number of opamps. It turned out that choosing equal resistor values results in an almost regular pattern of the voltage transfer function." | ||
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| + | {{ :paper_synth:ps301_-_diode_wavefolder.jpg?300 |}}\\ | ||
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| ==== Board ==== | ==== Board ==== | ||
| - | {{:paper_synth:ps301_diode_wavefolder_board.jpg|}} | + | {{:paper_synth:ps301_diode_wavefolder_board.jpg?400|}} |
| ---- | ---- | ||
| + | ==== Faceplate==== | ||
| + | {{:paper_synth:ps301-faceplate-.jpg?100|}}\\ | ||
| - | ==== Faceplate==== | ||
| - | {{ :paper_synth:ps301-faceplate-.jpg?100 |}} | ||
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| ==== Parts ==== | ==== Parts ==== | ||
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| pinstrip 90 deg 4 pins\\ | pinstrip 90 deg 4 pins\\ | ||
| Thonkiconn 3.5mm jack socket 3 | Thonkiconn 3.5mm jack socket 3 | ||
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| ==== Scope Pictures ==== | ==== Scope Pictures ==== | ||
| Input Waveworm: SAW | Input Waveworm: SAW | ||
| - | {{:paper_synth:ps301scope1.jpg|}} | + | {{:paper_synth:ps301scope1.jpg?200|}} |
| - | {{:paper_synth:ps301scope2.jpg|}} | + | {{:paper_synth:ps301scope2.jpg?200|}} |
| - | {{:paper_synth:ps301scope3.jpg|}} | + | {{:paper_synth:ps301scope3.jpg?200|}} |
| - | {{:paper_synth:ps301scope4.jpg|}} | + | {{:paper_synth:ps301scope4.jpg?200|}} |
| - | {{:paper_synth:ps301scope5.jpg|}} | + | {{:paper_synth:ps301scope5.jpg?200|}} |
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| ==== Links ==== | ==== Links ==== | ||
| Sources of information \\ | Sources of information \\ | ||
| [[http://yusynth.net/Modular/EN/WAVEFOLDER/]] \\ | [[http://yusynth.net/Modular/EN/WAVEFOLDER/]] \\ | ||
| [[http://jhaible.com/legacy/jh_wavefolder.html]] | [[http://jhaible.com/legacy/jh_wavefolder.html]] | ||
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| + | ---- | ||
| + | ==== License ==== | ||
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| + | The PS301 - Diode Wavefolder was designed by **Antti Pussinen** 2016.\\ | ||
| + | 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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