.. _hardware_modifications_v1_2:

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 :ref:`analog frontend<hw_analog_fe>`. This massively increases EMI performance which prevents the :ref:`ADC Watchdog<firmware_meas_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_v1_3:

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.