Hardware Modifications for PCB v1.2

Analog Frontend

Note

Solder a 100 nF capacitor parallel to R315 in order to implement a low pass characteristic of the difference amplifier in the analog frontend. This massively increases EMI performance which prevents the ADC Watchdog from triggering.

Power Supply

Note

Replace transformer BV-EI-303-2010 with BV-EI-303-2050, which has the same footprint but a little more power and does not heat that much.

Hardware Modifications for PCB v1.3

Note

solder jumpers to bridge GND and Earth together must be soldered for the SD card slot to work properly. The card detect’s switch terminal is on Earth potential.