材料bom表：
j1 = rca audio input socket
j2 = rca audio input socket
c1 = 0.1uf-16v ceramic disc capacit
c2 = 0.1uf-16v ceramic disc capacit
c3 = 0.1uf-16v ceramic disc capacit
ic1 = ds1669 (is available from dallas sco.
sw1 = momentary push button switch
sw1 = momentary push button switch 来源:lidy
