Produsentens beskrivelse:The Synchrodyne is a multi part and multi use Eurorack module for the creation and manipulation of audio. Containing several pieces to a traditional synthesizer voice, the Synchrodyne is a powerful addition to any subtractive oriented system. However, it is designed primarily as an experimental sound source/filter, intended to push the limits of modular synthesis... WMD style.Synchrodyne concept. The Synchrodyne is designed as a way to implement a switched capacitor filter (SCF) chip without the use of a microcontroller to run the clock. We developed a fast analog VCO that can drive the SCF with a broad range of frequency control. The problem with this would be that the VCO is then dedicated to only running the filter. So we designed a frequency multiplier based around a Phase Locked Loop IC (PLL) to take the VCO and multiply its frequency up so that the VCO could be used as an audio source, while still controlling the filter. The PLL allows for many ratios of input to output frequencies to be selected, making the VCO a simultaneous audio and control source.The PLL introduced its own challenges. Taming the PLL to stabilize at high multiplication ratios required us to develop a damping circuit. The Damping and Track Speed controls cause the PLL to have its own sound, sort of a slew limiter and self Frequency Modulation. We wanted the Synchrodyne to distort nicely with audio input, and also to self-oscillate. We added single stage rectifiers to the -12 dB and -24 dB filter outputs for a more aggressive sound. We opted to develop a VCA and wavefolder for the front end of the filter to further expand the palette of distortion and processing.The core of the Synchrodyne is a 4 pole (-24 dB/octave) Switched Capacitor Filter circuit. The 2 pole output is tapped and provides a mellower filter sound. The Synchrodyne will self-oscillate at high resonances on both outputs. The switched capacitor topology is a sampled data construct, so at low cutoff frequencies the filter will produce aliasing noise, similar to the sample rate reduction on the Geiger Counter. It is also very stable and accurate: across its entire range (.02 Hz to 16 kHz) the filter will remain within ±0.2% of where it should be. Front end linear VCA Switchable four stage wavefolder TempCo sawcore VCO, ~.02 Hz to >400 kHz Linear (AC/DC) and expo (DC) FM with bipolar attenuators Calibrated 1V/Oct input, hard sync input Phase Locked Loop frequency multiplier/divider with variable slew and damping Switched capacitor filter, multimode output (LP/BP/HP) -12 and -24 dB/oct output taps, stable self-oscillation at -24 dB/oct Voltage control of filter resonance Single stage wavefolder on outs Expandable with Synchrodyne Expand 100% analog/discrete/CMOS
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