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FirstWatt F5 Turbo V3 Assembly Instruction Manual

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F5 Turbo 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:
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.
Version 2
F5 Turbo V3 Assembly Instruction.
http://www.firstwatt.com/pdf/art_f5_turbo.pdf
Page 1
.

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Summary of Contents for FirstWatt F5 Turbo V3

  • 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...

  • Page 2: Assembly Instruction

    F5 Turbo Assembly Instruction Version 2 Page 2 3. Assembly Instruction: Solder the ¼W resistors per BOM. Note that a gap about 1mm should be allowed between the body of resistors to the top of PCB. This is to prevent any arcing of high voltage from resistors to the ground plan.
  • Page 3 F5 Turbo Assembly Instruction Version 2 Page 3 D1 – D5 and D7 are MUR3020W locations. k. When mounting the mosfet and MUR3020W, make sure an insulation sheet is used to isolated the body from the heat sink. The drilling dimensions of the heat sink are provided at the end of this document. A heat sink size of 200mm x 400mm is used as an example.
  • Page 4 F5 Turbo Assembly Instruction Version 2 Page 4 p. Note that the MUR3020W should have their leads bended 90 deg also and then inserted into the PCB holes from bottom of the PCB. Do not forget 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.

  • Page 5: Tuning Procedures

    F5 Turbo Assembly Instruction Version 2 Page 5 Check the +Ve and –Ve point for any short circuit to the ground with a multi-meter. Note that a ground plan is used in the PCB design with a narrow gap. Thus extreme care must be taken care during soldering of any parts to prevent short circuit to the ground plane.
  • Page 6 F5 Turbo Assembly Instruction Version 2 Page 6 d. Power up the amplifier, the output DC offset should be close to 0V. Voltage across R20 and R23 should also be 0V. If not, power off the amplifier immediately and trouble shoot. e.
  • Page 7 F5 Turbo Assembly Instruction Version 2 Page 7 mosfet is matched within a reasonable limit and share an almost equal load on the total bias. Note that the DC offset will drift from cold to hot and it is normal. The target is that when hot, the dc offset should be within +/-10mV relative to ground.
  • Page 8 FET Audio A-A 2 CHANNEL THD vs FREQ 12/12/12 20:58:00 Grounded Input 0.05 Floated Input 0.02 0.01 0.005 0.002 0.001 100m 200m 500m Sweep Trace Color Line Style Thick Data Axis Comment Solid Anlr.THD+N Ratio Left Float input, lower noise Magenta Solid Anlr.THD+N Ratio...
  • Page 9 FET Audio 12/12/12 20:47:42 -100 -110 -120 -130 -140 -150 -160 -170 -180 Sweep Trace Color Line Style Thick Data Axis Comment Solid Fft.Ch.1 Ampl Left Set 3 : 32V supply Magenta Solid Fft.Ch.2 Ampl Left F5T FFT2.at27...
  • Page 10 REVISION RECORD ECO NO: APPROVED: DATE: 0.22uf 0.22uf 0.22uf J1-1 J1-2 2SC2240BL 1000uf 475R 1R3W 1R3W 1R3W 1R3W 1R3W 1R3W KSC2690AYS MUR3020W MUR3020W MUR3020W +32V LED1 TH1 4k7 0.22uf 2SK170 IRF9240 IRF9240 IRF9240 220R3W Do not use J2-1 220R3W J7-1 INPUT OUTPUT J7-2...
  • Page 11 F5T BOM Cost page 1 of 1 Item Reference Value Manufacturer Description PCB DECAL 2SA1145Y TOSHIBA PNP Low Noise PNP Transistor TO-92D Do not use Fairchild PNP Driver Transistor TO-2-8H1AB 2SC2705Y TOSHIBA NPN Low Noise NPN Transistor TO-92D Do not use Fairchild NPN Driver TRANSISTOR TO-2-8H1AB...