Electronic Components and Parts for Audiophiles, Ham
radio operators, experimenters and university physics departments. I
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F4 Kit of
Semiconductors and Other Components. (Order 2 for Stereo, etc., etc.)
F4 Kit Bill of
Materials
Quantity
RefDesig
Description
2
Q3..Q8
IRFP240 and IRFP9240
Matched Triplet
1
Q1
2SK170BL "N" JFET
1
Q2
2SJ74BL "P" JFET
1
Q11
TL431 or PM431 Shunt
Reg
2
D1,D2
1N4736 Zener Diode
6
R16..R21
0.47Ω 5W source
resistors
4
C1..C4
220μF 35VDC Elna Silk
Electrolytic Cap
$28.50
F4 Kit -- Semiconductors Only
F4 Semi
BOM
Quantity
Ref
Desig
Description
2
Q3..Q8
IRFP240
and IRFP9240 Matched Triplet
1
Q1
2SK170BL
"N" JFET
1
Q2
2SJ74BL
"J" JFET
1
Q11
TL431 or
PM431 Shunt Reg
2
D1,D2
1N4736
Zener Diode
$21.50
F5 Kit of
Semiconductors and Passive Components -- Parts for One Channel -- Note
that we include a matched set of JFET's -- this allows you to more
closely match the drain current through each device.
F5 Bill of Materials
Quantity
RefDesig
Description
2
P1,P2
5K Bourns 3266W Trimpot
2
R1,R2
10R, PPC10
4
R3, R4,R15,R16
2K2 0.25W RN55D
2
R5,R8
50 Ohms, 5W Dale
3
R9,R17,R18
1K 0.25W RN55D
1
R10
100K 0.25W RN55D
2
R11,R12
0.47R 3W
2
R13,R14
47RΩ, 0.25W RN55D
2
R19,R20
150Ω,
0.25W, RN55D
2
R21,R22
10K, 0.25W, RN55D
2
TH1,TH2
4.7K 3900Ω Thermistor
1 set
Q1,Q2
2SK170 + 2SJ74 Matched
1
Q3
FQA19N20C
1
Q4
FQA12P20C
$26.00
No Boards for the PASS kits --
it's their IP -- but the above will help you put together these very
nice amplifiers.
B1 Buffer -- the only part
we source are the 2SK170BL JFETS LINK
*Pass recommends 2 100 Ω 3
Watt resistors in parallel. We measured the dissipation of these
to be just over 3 Watts when the amplifier is running 25W into 8Ω
