IoT-devices, LLCThe Geiger counter module GGreg20_V3 has built-in protection against reverse polarity. This function is realized by means of a Schottky diode.
The module can operate in two modes:
(1) with protection against reverse polarity;
(2) with an extended range of power supply voltage.
Read full article:
https://iot-devices.com.ua/en/technical_note_supply_voltage_range_geiger_counter_ggreg20_v3/
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