Polyphonic Synthesizer

8 Voice polyphonic analog Synthesizer-
Analog VCO, VCF and VCA.
Digital controlled EG and modulation

derItist

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Description
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Components 9
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Details

I am working mostly reading or thinking on this project since several years.
The final instrument should have the following specs:
8 voice polyphonic
2 VCOs, 1 Multimode Filter, 5 EG, 5 LFO per VoiceFor all voices (Master section)
2 LFO, 2 EG, 1 RM , 1 Fixed Filter bank

I start with building a MIDI only instrument.

The envelope generators (EG) and the LFOs should be digital controlled/ implemented in a µC or FPGA

Here some videos of my Youtube channel

I implemented my first Envelope Genertator. You find more details at the following Link
http://itist.de/2015/08/first-software-envelope-generator/

This is a first test:

The test shows a key down with an retrigger in the release phase (time013) followed by a complete run (finished at030) then you see a aborted attack phase (time035).

Greetz
Oliver

Components

1 × ATMega32 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × LTC2756 Data Converters / Digital to Analog Converters (DACs)
2 × LT1012 Amplifier and Linear ICs / Operational Amplifiers
4 × LT1055 Amplifier and Linear ICs / Operational Amplifiers
1 × 4051 Multiplexer

View all 9 components

Project Logs

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First Software Envelope Generator
derItist • 08/26/2015 at 21:13 • 0 comments

First tests with my controller board ATMEGA 32, 8Mhz LTC2756 18Bit DAC
Made some changes in the coding.
MAXVALUE=262144
A_Rate = 1000
D_Rate = 500
S_Level= 131072
R_Rate = 250
Update Rate: 1ms
Oscilloscope Setting: 200ms/cm
MAXVALUE=262144
A_Rate = 10000
D_Rate = 500
S_Level= 131072
R_Rate = 250
Update Rate: 1ms
Oscilloscope Setting: 50ms/cm
MAXVALUE=262144
A_Rate = 100000
D_Rate = 500
S_Level= 131072
R_Rate = 250
Update Rate: 1ms
Oscilloscope Setting: 1ms/cm
Start
derItist • 07/03/2015 at 19:43 • 0 comments

I started my Polyphonic Synthesizer Project with an Arduino Board and an discrete build digital to analog converter.
First idea:
First breadboarding