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AVRSynth is a monophonic "virtual analog" synth based, originally, on the Atmel AT90S8535 microcontroller and was designed by Jarek Ziembicki. His aim was to check to see if a simple micro could be used for sound synthesis purposes. And the result? The AT90S8535 managed to do all the tasks: front panel switches and pots services, receiving and processing MIDI messages, and sound generation!

The synthesis architecture is simple:-

two DCO's, a DCF, and a DCA. There is also an LFO and an AR/ASR envelope generator.

Since this initial design was made we have taken over the project and updated the hardware to take the ATMEGA16 as the AT90S8535 is no longer a production item.

AVRSynth was also released as a full unit in a small desktop case (Mk1) and with a new panel design (Mk2)

Mk 1

Mk 2

Panel components on the the Mk 1 are hard-wired to the main board while the Mk 2 unit employs a Carrier Board to eliminate hand-wiring to the front panel providing for a quicker and easier build.

Source code for the AVRSynth is available (written in Assembler) for those wishing to add new features or experiment with software synthesis.

Unit Dimensions
279mm x 160mm x 77mm
12VDC @ 100mA

Sound Samples: 1 2 3

Email:  elby_designs@ozemail.com.au
© Copyright 2000. All rights reserved.     Revised: February 11, 2017