Credit Cornblatt. Taken from
http://66.11.76.181/mc_temp/
This circuit works with the following stereo.
Instructions:
PCB of 97-98 bose:
Schematic:
http://66.11.76.181/mc_temp/Matts_Ni...ut_Circuit.pdf
Parts:
Bill Of Materials <Sat Jun 07 16:51:51 2003>
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Qty Description Reference Cost Value
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6 RES 0805 680R 5pct R7-8 R11-12 0.02 680R
R15 R29
20 RES 0805 10K 5pct R1-6 R13 0.02 10K
R17-19 R21
R23-28
R30-31 R33
4 RES 0805 10R 5pct R9-10 R14 0.02 10R
R20
3 CAP 0805 0.1UF 25V X7R C13-15 0.04 0.1uF (Panasonic ECJ-2VB1E104K)
8 CAP ELEC 33uF 50V SMT C1-7 C16 0.35 33uF (Nichicon)
Long Life
1 Voltage Regulator, U3 0.7 LMS1587CSADJ (National Semi)
Linear LDO, 3A, Adj
3 Header, Male, 1x4 SMT J3-5 0.4 TSM-104-01-T-SH (Samtec)
Horizontal 0.1"
1 Switch, NO, RA, PCB S1 0.50 B3F-3152 (Omron)
mount
2 SWITCHING DIODE D1-2 0.1105 BAV74 (Fairchild)
3 DUAL OPERATIONAL U1-2 U4 0.53 LM833M (National Semi)
AMPLFIER
2 Transistor, NPN, Dual, Q2-3 0.2276 XN01501 (Panasonic)
50V, 100mA
1 Dual RCA Jack, Red/White J2 0.65 RCJ-2123 (CUI Stack)
I have not personally tested this method, but I am posting it here for reference for those that have the newer BOSE design. The general method outlined in the 1st post should also work on this model of HU, based on the pic of the PCB, but again it has not been verified.