Archive for May, 2017

Infinity37 – Now as open-source DIY

May 31, 2017

In the menu to the right.




SSI2144 now available in single quantities

May 23, 2017


The SSI2144 reprises the SSM2044 of legacy chipmaker Solid State Microtechnology, which many believe to be the best-sounding analog synthesis filter IC ever produced.

Based on Dave Rossum’s patented classic improved ladder topology, the SSI2144 allows rich tonal characteristics that showcase the very best attributes of subtractive synthesis.

The SSI2144 uses the same internal circuit as the SSM2044 but in a SSOP-16 package.

It is now available at DSP Synthesizers in single quantities for DIY projects.
There is also an adapter PCB for converting it to a DIP-16 SSM2044 replacement to upgrade or repair vintage synthesizers.

Infinity – First synth based on the Polytron DCO

May 13, 2017

This is the prototype of the Infinity37.

Using the Polytron37, fully polyphonic DCO chip and featuring the brand new SSI2144 VCF, it will be a groundbreaking new analog hybrid synthesizer.

This is divide-down oscillator technology and filters in 2017.


First test with the raw output from the chip and no filter.

Second test, Deep PWM string sound.

The Polytron Oscillator

May 9, 2017

Remember the old top octave divide down organ oscillators?
They where fully polyphonic although with limited on/off envelopes.

The Polytron keyboard oscillator is a modern divide down oscillator.
Besides being fully polyphonic on 37 keys it also features polyphonic Attack and Release envelope, separate for each key.

It scans the 37-key keyboard, sends and receive MIDI, handles analog inputs for pitchbend and modulation, has analog inputs for ENV and outputs the audio and gate for following filters etc.

And it uses a 16-bit DAC output.

Perfect for building a hybrid analog polyphonic synthesizer.

Available in June.



The Phase Distortion Oscillator

May 6, 2017

The micro, tiny and mini-TS all use a PD oscillator.

2 oscillators of the CZ1 chip makes up as the DCO. This is a version of FM synthesis.

There is no real filter but emulated like the Roland D50 and Casio CZ synthesizers.

That is what makes it sound so great with just an ATmega chip.