Hi, I am starting to look into EMG/ECG circuits and was always curious about patient protection from an improbable surge of current through the electrodes. Though highly unlikely, I was wondering if that's what the use of these back-to-back diodes in the following schematic are for:
IN+/IN-/BODY are the three electrodes.
From my understanding, the ac electrode signals will be too weak to turn on the diodes so they will pass unaffected, but any significant DC voltages will be clamped at 0.7 V to protect both the person and the circuitry?
Does this sound about right?
Thanks again,
JP
IN+/IN-/BODY are the three electrodes.
From my understanding, the ac electrode signals will be too weak to turn on the diodes so they will pass unaffected, but any significant DC voltages will be clamped at 0.7 V to protect both the person and the circuitry?
Does this sound about right?
Thanks again,
JP