Archive for the ‘Uncategorized’ Category

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.

mini-WASP ??

May 16, 2017


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.

DSP Modular site closing

May 10, 2017

The site will be closing in May as we will no longer offer prebuilt euro modules.

We will concentrate on the DIY chips and synths available at

There will also be a $10 shipping fee for US residentials per package and the parcel will be declared to its full value for customs and toll fees.

Jan Ostman
DSP Synthesizers

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.

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.

euro-TS – 14HP Synth/Keyboard Module

May 4, 2017

This is the micro-TS synth built into a 14HP Eurorack module.

It is revolutionary in the sense that the keyboard is sticking out of the module like knobs normally do.

It outputs CV/Gate from the keyboard and is meant to be played.

The CV is 1 volt/octave and can be transposed with the Pitch knob.

I rather like to keep this to my self so you cant buy it.


The microTS – Smallest synth in the world

April 29, 2017


Now available in the menu to the right.

Check it out!

The Breadboard TS

April 21, 2017

What do you get if you pair the mini-TS with a 830-point breadboard?

A truley DIY synth experimental kit that is 100% modular. Build it any way you want.

The mini-TS assists you with a keyboard that generates 1v/octave CV and Gate, MIDI and a square wave oscillator and you are free to breadboard your synth ideas at your will.

Works great with any of the chips from but also with any other chips.

The power is short circuit protected and wont brake anything if you make a mistake.

Feel free to connect up any of your ideas for instant playing.


Follow the mini-TS project

April 15, 2017

You find it in the menu to the right.