Detailed Parts List 40w into 8 ohms, 40w into 4 ohms:

The list below uses the part numbers that correspond to the PCBs that were part of the original group purchase back in December of 2002 from DIYAudio.com. This list was developed by Grey and contains everything that you need to populate the circuit board.

Bill of Materials:

Type/Value
Qty/Ch
Component Reference Identification
Mouser Part #
Price @
Ext Price
10pF
2
 C2, C4 5982-15-500v10
$0.44
 $0.88
220uF 25V
4
 C1, C3, C5, C6 140-ESRL25V220
$0.38
 $1.52
1n5239b
5
 D1, D2, D3, D4, D5 625-1n5239b
$0.06
 $0.30
IRF9610
3
 Q5, Q6, Q7 Digikey IRF9610-ND
$0.58
 $1.74
IRFP044
4
 Q1, Q2, Q10, Q11 IRFP044-ND
$2.59
 $10.36
MPSA18
4
 Q3, Q4, Q8, Q9 610-MPSA18
$0.30
 $1.20
0.22 5w
4
 R5, R6, R40, R41 71-rs5-0.2
$1.61
 $6.44
0.22 5w
4
 R2, R3, R42, R43 71-rs5-0.2
$1.61
 $6.44
3.0 5w
1
 R21 71-rs5-3
$1.49
 $1.49
30.0 12w
4
 R1+R4, R44+R45 71-rh10-30
$1.46
 $5.84
100
2
 R13, R35 71-rn60d-f-100
$0.21
 $0.42
221
9
 R7, R9, R10, R20, R22, R27, R36, R38, R39 71-rn60d-f-221
$0.21
 $1.89
332
1
 R26 71-rn60d-f-332
$0.21
 $0.21
392
2
 R23, R25 71-rn60d-f-392
$0.21
 $0.42
475
1
 R24 71-rn60d-f-475
$0.21
 $0.21
511
2
 R14, R31 71-rn60d-f-511
$0.21
 $0.42
1.0k
4
 R8, R15, R32, R37 71-rn60d-f-1.0k
$0.21
 $0.84
1.2k
2
 R12, R34 71-rn60d-f-1.21k
$0.21
 $0.42
1.5k
1
 R17 71-rn60d-f-1.5k
$0.21
 $0.21
4.75k
2
 FEEDBACK PAIR 71-rn60d-f-4.75k
$0.21
 $0.42
10k
2
 R18, R28 71-rn60d-f-10k
$0.21
 $0.42
47.5k
2
 R11, R33 71-rn60d-f-47.5k
$0.21
 $0.42
68.1
2
 R19, R29 71-rn60d-f-68.1k
$0.21
 $0.42
100k
2
 R16, R30 71-rn60d-f-100k
$0.21
 $0.42
100k
2
 V1, V3 72-t93ya-100K
$1.20
 $2.40
200
1
 V2 72-t93ya-200
$1.20
 $1.20

All together, this works out to about $50 per channel for the parts listed above (remember, you still need a powe supply, chassis, etc). Just substitute this bill or materials for the one on the page for the 100w parts list and use a 400VA transformer with dual 12v secondaries and you should be ready to go. All other parts stay the same. For this lower powered amp, (nearly) all spots on the PCB should be filled and you will only need a single mosfet for each of Q1, Q2, Q10, and Q11. You will still need to match Q2 with Q11, Q1 with Q10, and Q5 with Q7.