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Related Manuals for Expert Sleepers Persephone
Summary of Contents for Expert Sleepers Persephone
- Page 1 User Manual Revision 1.0...
- Page 2 Expert Sleepers Ltd. Expert Sleepers Ltd assumes no responsibility or liability for any errors or inaccuracies that may appear in this document.
- Page 3 Table of Contents Introduction..................................4 Installation.................................... 4 Power requirements..............................4 Inputs and outputs................................5 Controls....................................5 Signal fow.................................... 6 Audio path..................................6 CV path..................................... 6 Use as a “regular” VCA..............................7 Zero-cross detection............................... 7 Calibration.................................... 8 Where to get help................................8 Acknowledgments................................
- Page 4 Congratulations on your purchase of an Expert Sleepers “Persephone”. Please read this user manual before operating your new module. Persephone is a VCA (Voltage Controlled Amplifer) using a discrete JFET as the gain element. The JFET can be tastefully (or violently) overdriven for saturation/distortion efects.
- Page 5 Inputs and outputs Persephone's input and output jack sockets are illuminated, lighting red for positive voltage and blue for negative voltage. (Audio appears purple, since it is a rapid alternation of positive and negative.) Inputs with attenuators are indicated by a dotted line linking the socket to its corresponding attenuator knob.
- Page 6 Signal flow The diagram below shows the module's operation in outline: Audio path The two audio inputs are summed (mixed), and then pass through three gain stages: the Pre stage (i.e. pre-VCA), the VCA itself, and the Post stage. The purpose of the Pre stage is primarily to reduce the input level to one that the VCA can handle with reasonable linearity;...
- Page 7 Use as a “regular” VCA To use Persephone as a common-or-garden VCA, with minimal distortion, we suggest the following: Set Pre to 0, and Post to 10. – Disable Asymmetry. – Adjust Bias until the sound is just cut of with no CV applied.
- Page 8 Calibration A trim pot (marked RV5) on the PCB allows for adjusting the VCA gain. Persephone is factory- calibrated so that the module gives unity gain with Bias set to 10, Pre set to 0, and Post set to 10.
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