Bill of materials: C1 : 4.7µF 16V C2, C3 : 10µF 16V C4 : 33µF 25V C5, C6 : 100nF ceramic D1 : 1N4148 (any small signal diode is ok) J1-J4 : stereo jack J5 : power supply connector M1 : Sub-D 25 pin female connector U1 : MAX186 U2 : MAX1044 (ICL7660 or any equivalent)