Very cheap low-speed dual channel PC/USB oscilloscope with STM32 (STM32F103C8T6) microcontroller
Miniscope v2c is a very simple USB interface for low-speed oscilloscope/recorder capable with continuous sampling and streaming to PC at 2×300 kSps speed. It is stripped down from switchable analog amplifier that version v2b had, but it is using small single-side PCB that would be easy to make with toner transfer method and parts should cost less than $10 total.
Miniscope v2c – Cheap low-speed dual channel USB oscilloscope with STM32 - [Link]










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