SMeter_Hardware. There are 2 eagle projects. The display unit and the db-linear amplifier. The display unit serves multiple purposes. It provides clean, linearly regulated and filtered plus/minus 5V supply to the amplifier, it measures its output and displays it on the 2x16 character LCD. It can also communicate with a computer via USB (see SMeterApp).

github.com/soldernerd/SMeter_Hardware

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