MCP41100 digital potentiometer with Arduino/STM32 — Curious Scientist
500K ohm Top Adjustment Knurled Shaft 3 Pins Pot Taper Potentiometer - Walmart.com
Alpha Single-Gang 16mm Right-angle PC Mount - 250K Linear [RV16AF-41-15R1-250K-30H4] : ID 5276 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Panel Mount 10K Dual Log Potentiometer [10K Dual Log] : ID 3394 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Potentiometer - Wikipedia
Tutorial: Potentiometers with Arduino and Filtering – Norwegian Creations