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

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

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

UUID issue when moving or renaming virtual disks in Virtualbox.

From Linux command prompt.

vboxmanage  internalcommands sethduuid "/home/mal/VirtualBox VMs/Windows 7/Windows 7.vmdk"