Here is a diagram of the circuit: https://www.dropbox.com/scl/fi/1vel01ykowjq7yxa8z3a3/HarpMicToneCurcuit.png?rlkey=17aepbfwnrw1fkluacoxkbh6z&st=oczbnxa1&dl=0 Derwood derwood.blues at xxxxx verbis defectis musica incipit