TechDIY Company Store TechDIY Projects

Electronic Components and Parts for Audiophiles, Ham radio operators, experimenters and university physics departments.  I realize that this website isn't elegant, you don't have to tell me.  Cancel your own damn subscription!

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SHIPPING RATES HIT THIS LINK -->  SHIPPING

Operational Amplifiers IRF (Vishay) and Fairchild MOSFETs and Audio Power Bipolar Transistors Renesas Lateral MOSFETs Small Signal Transistors and JFETs Power Supply Components,  Diodes, Capacitors, Power Resistors
ADC's DAC's Voltage References Amplifier Kits and Components for Nelson Pass F4 and F5 Amplifiers Chip Amplifier Kits of Parts and Printed Circuit Boards (LM3886, LM3875, LM4780) LM4702, LME49830 Printed Circuit Boards Relays, Switches
RF Connectors Photo-Receptors, Photo-Diodes, Photo-Multiplier Tubes Tube Amplifier Kits of Parts, Printed Circuit Boards Test Equipment Printed Circuit Boards and Kits Test Equipment for Tubes!
Power Supply Stuff and WIMA, Mallory caps        
         
 
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