I've made a preamplifier (with an oap) to connect to my handholds using Frex. Can I connect your UDB1108S with it?

The voltage and offset of the UDB1108S can be adjusted. We do not know the circuit of your amplifier. If your circuit is designed for low level signals then you may need to use 2 resistors to further reduce the output from the UDB1108S.

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