Sure, for example to make drum/knock sensors. To detect hitting it, an AC coupling will do.
And piezo element as a sensor is in theory DC, but with normal use it is more as a AC sensor. So a AC coupling can be almost the same as DC for piezo.
Sure, for example to make drum/knock sensors. To detect hitting it, an AC coupling will do.
And piezo element as a sensor is in theory DC, but with normal use it is more as a AC sensor. So a AC coupling can be almost the same as DC for piezo.