Shruthilogy
Playing around with the nice playable build in sequencer in the lovely DIY Shruthi-1
The developer describes it as a “best of both worlds” design:
Digital…
An 8-bit microcontroller plays the role of the two main oscillators + sub-oscillator. This allows the generation of (aliasing-free) classic analog waveforms, but also wavetable/transwave synthesis and a trove of weird digital algorithms (sinewave bitcrushing, formant synthesis, phase distortion, bit toggling, XOR modulation).
… and Analog
Beyond this point, everything is analog. Most of the Shruthi-1s are built with the SMR-4 filter, a warm 4-poles “modern analogue” low-pass (no vintage IC). But you are in no way limited to this! The filter section of the Shruthi is on its own board and can be easily replaced. We currently offer 2 alternatives filter boards, one with the CEM3379 VCF/VCA chip of the Ensoniq/Waldorf fame ; and one with the classic SSM2044 VCF. More to come, based on vintage chips or modern OTAs and VCAs! From silky-smooth to squelchy or fat: pick the filter that matches your personal taste best.
The Shruthi-1 has an audio input: external signals can be processed by its analog section, under the control of the digital LFOs, sequencer and arpeggiator for crazy gating and re-enveloping effects. A perfect way of warming up the sound of your favorite VA or… cheesy organ!
The kit includes everything needed for building the Shruthi-1 synth, except for the enclosure:
- PCB for the digital section and the filter
- All electronic parts / ICs
- Pre-prgrammed ATMega644 and patches/sequences storage EEPROM
- Switches caps / knobs
- Blue backlight LCD display
- Connectors
- A pack of screws / spacers / nuts for holding the two boards together
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