FirstWatt F5 Turbo V3 Assembly Instruction Manual Download Page 1

F5 Turbo Assembly Instruction 

Version 2  

 

 

 

 

Page 1 

F5 Turbo V3 Assembly Instruction. 

1.

 

Introduction: 

This PCB is designed base on the Nelson Pass F5T V3 circuit.  Details please refer to the article posted by 

Nelson on First Watt website: 

http://www.firstwatt.com/pdf/art_f5_turbo.pdf

 .  

2.

 

Circuit Diagram: 

Since the PCB is layout by FETAudio and here is the circuit diagram for reference. 

 

Notes: 

a.

 

The Q7 and Q8 is in TO-92 package.  I have also put TO-220 package pads in the PCB if the 

original transistor recommended by Nelson is used. 

b.

 

J7 is a pin header and it should be shorted to ground by a jumper for normal operation.  The 

“X” point is for those who want to modify the power amp into F5X mode. 

c.

 

Since I use Toshiba 2SK1530 and 2SJ201 power mosfets, I have changed some values of 

some components and thus please refer to the update BOM (bill of material) for details. 

 

www.FETAudio.com

Summary of Contents for F5 Turbo V3

Page 1: ...the circuit diagram for reference Notes a The Q7 and Q8 is in TO 92 package I have also put TO 220 package pads in the PCB if the original transistor recommended by Nelson is used b J7 is a pin heade...

Page 2: ...direction of the P3 as shown below c Solder the 3W resistors d Solder the Jfets K170 and J74 Q1 and Q2 Then solder the transistors Q7 and Q8 e Lastly solder the E capacitors f Note that J15 and J16 TH...

Page 3: ...screws total 4 from top and screw in a 10mm spacer post at the bottom of the pcb n When mounting the mosfet fix them onto the heat sink as shown Bends the leads about 90 deg upwards Put the PCB on to...

Page 4: ...the insulation sheet for them It should be quite easy to do so as the leads of MUR3020 is just long enough to protrude out the hole by about 1 5mm q When all the PCB screws are in position and tighte...

Page 5: ...soldering of any parts to prevent short circuit to the ground plane Due to the narrow gap the supply voltage of this PCB should not be more than 40V 4 Tuning procedures a Before power up adjust P1 and...

Page 6: ...oltage across the R20 and R23 should be 0 333V Note that the voltage across R20 and R23 will not be the same but should be close within 10 if the mosfet are well matched g Then repeat the step e until...

Page 7: ...t DC offset and voltage across R20 I think two meters is a minimum l For P3 pot adjustment refer to Pass s article for details m Picture of a complete set F5 Turbo This set use Airlink 625VA 25Vx2 tra...

Page 8: ...Anlr THD N Ratio Left Float input lower noise 1 3 Magenta Solid 1 Anlr THD N Ratio Left 2 1 Green Solid 1 Anlr THD N Ratio Left Grounded input higher noise 2 3 Red Solid 1 Anlr THD N Ratio Left 0 001...

Page 9: ...Style Thick Data Axis Comment 1 1 Red Solid 1 Fft Ch 1 Ampl Left Set 3 32V supply 1 2 Magenta Solid 1 Fft Ch 2 Ampl Left 180 10 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 d B r A 20...

Page 10: ...34 1R3W R36 47R R40 15k J1 1 J1 2 J2 1 J2 2 J3 1 J3 2 J4 1 J4 2 K A LED1 J5 1 J5 2 C1 1000uf 35V C2 1000uf 35V C10 0 22uf C11 0 22uf C6 0 22uf C5 0 22uf Screw J6 Screw J8 Screw J9 Screw J10 Screw J11...

Page 11: ...17 J15 J16 4 7k TH1 with shrink tube China Varistor negative temp 4k7 2 SIP 2P 18 R25 26 10K Xicon RES BODY 060 CENTERS 400 2 RM10_1 4WR 19 R3 4 10R Xicon RES BODY 060 CENTERS 400 2 RM10_1 4WR 20 R40...

Page 12: ...w w w F E T A u d i o c o m...

Page 13: ...w w w F E T A u d i o c o m Position X Y 0 0...

Page 14: ...w w w F E T A u d i o c o m...

Page 15: ...w w w F E T A u d i o c o m...

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