DIY Synth

Parts

Breadboard Starter Kit
$9.25
https://www.aliexpress.com/item/1005006480276775.html

** More expensive and higher quality breadboard. Breadboard only, you will need to purchase wires and other items separately***
$10.00
https://www.jameco.com/z/WBU-202-R-Jameco-ValuePro-830-Point-Solderless-Breadboard-6-5-x-2-125-with-Adhesive-Backing-and-Metal-Baseplate_20723.html

WeAct BlackPill STM32F411CEU6
$3.50
https://www.aliexpress.com/item/1005001456186625.html

ST ST-Link V2 Mini
$1.70
https://www.aliexpress.com/item/1005005494623572.html

6N137 Opto Isolator (10 Pack)
$1.40
https://www.aliexpress.com/item/1005002002451701.html

5 Pin Midi Connector Set
$1.60
https://www.aliexpress.com/item/1005007078692939.html

Resistor Kit
$5.00
https://www.aliexpress.com/item/1005002364388450.html

PCM5102A DAC Decoder
$1.95
https://www.aliexpress.com/item/1005007477490325.html

Diode 1N4148
$1.00
https://www.aliexpress.com/item/1005007038395054.html

Desoldering Tool
$1.30
https://www.aliexpress.com/item/1005006000431903.html

Soldering Iron
$3.50
https://www.aliexpress.com/item/1005005985613604.html

Solder
$1.90
https://www.aliexpress.com/item/1005005985613604.html

MIDI Keyboard
You will need a midi keyboard to connect to your Synth via midi cable. Check Craigslist, Facebook Marketplace and EBay for cheap used one.