The DSO138 from JYETech is a tiny STM32 micro-controller based ‘scope that can be bought as a kit and I’ve had great success using it for various hobby-based electronics projects when the use of a full featured “professional ‘scope” just isn’t justified.
I recently discovered the Raspberry Pi Pico based “scoppy” via this YouTube video.
The Pi Pico is limited to approximately 500k samples/second so has a useful bandwidth of 250kHz or less. The rising edges of the two 1PPS signals displayed in the screenshot above are aligned to within a few 10s of nanoseconds, but they look coincident as the resolution in this mode is limited to 2µs – 250ksa/s per channel when in 2 channel mode.
Room 7609 