Quantity   Component name
1 × Arduino Nano
8 × ISD1720 20 sec. voice recorder chip, http://www.microtechnica.tv/support/manual/ISD1700_Design_Guide.pdf
2 × NJM4580 Amplifier and Linear ICs / Operational Amplifiers (NJM4556A is also usable)
1 × B0505S-1W 5V output isolated DCDC, https://octopart.com/datasheet/b0505s-1w-mornsun-27705994
1 × LM317 Power Management ICs / Linear Voltage Regulators and LDOs
1 × LM337 Power Management ICs / Linear Voltage Regulators and LDOs
1 × 74HC4040 12-stage binary ripple counter
8 × TS12A4514DBVR 1ch analog switch
1 × Rotary encoder with push switch Rotary encoder
11 × Cherry MX keyboard switch keyboard switch
1 × 16x2 LCD 16x2 LCD (via I2C I/F), https://vi.aliexpress.com/item/1005004019013572.html
2 × WS2812B Full color LED
1 × USB Type C connector for power 6pin
1 × RCA audio jack
2 × 3.5mm stereo jack
2 × Potentiometer A10k - A100K Audio taper