Sunday, 15 October 2017

JOTA 2017 Synth. Final files etc.

This years JOTA soldering project is a synthesiser. It is not particularly musical, but does make interesting sounds.

The sythesisor uses capacitive sensing to detect when a key is touched.

The 6 potentiometers are for controlling:

DCO (Digitally controlled oscillator): Coarse pitch and Double.
DCF (Digitally controlled filter): Filter peak and ENVmod.
ENV Attack and Decay envelope): Attack and Release affecting amplitude.

The project is a modified version of the project described at https://janostman.wordpress.com/2016/11/28/the-tiny-ts-a-diy-touch-synthesizer/
The midificaitons are to use the Arduino Nano instead of 'raw' chip.

The main components of the synth include:

  • 12 key touch keyboard.
  • 6 potentiometers to vary the sound. These are connected to analog inputs on the micro-controller to vary the sounds in the software.
  • Arduino Nano running special DSP (Digital Signal Processing) code to detect key presses and generate sounds based on the potentiometer positions.
  • LM386 audio amplifier module to amplify the sound from the micro-controller and send it to a small speaker.
  • The project is run from a 9v battery.









Source Files



Thursday, 4 May 2017

To have windows open Excel in a separate window like Word does.

See the following link.
https://support.microsoft.com/en-gb/help/2636670/how-to-open-excel-files-in-separate-windows-in-windows-7

This worked on Windows 7 with Office 2010

Sunday, 9 April 2017

2017 JOTA Project. JOTASynth

Schematic









1st Prototype



Bill of Materials.














Item Designation Supplier Price Pack Size Price Each Qty Total
Potentiomeer R1-R6 Mouser $560.00 2000 $0.28 6 $1.68
PCB PCB Seeed Studio $546.00 300 $1.82 1 $1.82
Arduino Nano Nano Ali Express / Banggood $281.77 100 $2.82 1 $2.82
LM386 Module
Ali Express / Banggood $12.83 20 $0.64 1 $0.64
Hookup Wire for Speaker






SIL Pin Headers






9V Battery Snap
Ali Express / Banggood $10.80 100 $0.11 1 $0.11
0.22uF Electrolytic Capacitor C3 Mouser $26.25 250 $0.11 1 $0.11
9V Battery
Mouser $388.50 210 $1.85 1 $1.85
100nF 104 Capacitor C1 Mouser $6.20 100 $0.06 1 $0.06
1k Resistor ¼ watt R7 Mouser $23.00 1000 $0.02 1 $0.02
100k Resistor ¼ watt R10 Mouser $23.00 1000 $0.02 1 $0.02
470R Resistor ¼ watt R11 Mouser $23.00 1000 $0.02 1 $0.02
Speaker (estimate)
Ali Express / Banggood $533.91 400 $1.33 1 $1.33
1N4004 D1 Mouser $7.00 250 $0.03 1 $0.03








Total





$10.52

Sunday, 12 March 2017