Amplifier Actrk400 ACTRK600 circuit Mosfet IRFP460 600W

Amplifier Actrk400 ACTRK600 circuit Mosfet IRFP460 600W 4

Amplifier Actrk400 ACTRK600 circuit Mosfet IRFP460 600W. The article discusses two amplifier models, one at 400 watts and the other at 600 watts, that are designed to deliver high power output. The Actrk400 amplifier utilizes 6 n-channel Mosfet transistors at the output and produces around 400 watts at 4 ohms. In comparison, the Actrk600 amplifier employs 12 n-channel Mosfet transistors and delivers over 600 watts at 4 ohms.

The ACTRK600 is a power amplifier that uses 12 N-channel MOSFETs (IRFP460) and is known for its robust performance. Here are some key details:

Power Output: It can deliver around 600W at 4 ohms.
Voltage Supply: -60 to -90V DC, dual supply. Usually +-75V

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Schematic Amplifier Actrk400 ACTRK600 circuit Mosfet IRFP460 600W

Schematic Actrk600
Schematic Actrk600

T4 must be mounted on the main heatsink as close as possible to the output FETs.
T6, T7 and T8 dissipate about 3 watts of heat in total and must be mounted on a heatsink
T9. T11 etc = between 3 and 6 IRFP450 or similar, depending on power required.
T10, T12 etc = between 3 and 6 IRFP450 or similar, depending on power required.

ACTRK600 Amplifier (12 N-Chanel Mosfet IRFP460) - first start

Under no circumstances should you turn on this amplifier without checking for errors and assembly, turn it on through a light bulb or resistor to avoid burning something. Make sure the power supply is fully functional and meets the necessary parameters. Check if the power supply provides the required voltage and current. Another point is that to start the amplifier, you do not need to solder all pairs of output transistors, solder only part of them, if the start is successful, you can solder the rest. Using a multimeter, set the resistance of VR2 to the maximum resistance. Correctly connect the grounding, positive and negative power terminals. Temporarily remove the fuses and replace them with 5 watt resistors at 100 ohms. And you can start slowly.

Final Set up And Adjustment
Do not attempt to set up or test a power amplifier module that is not properly mounted on a heatsink. Ensure that the main power supply is fused and that the work area is free of any obstructions. Before proceeding, check all of your work and confirm that the output devices are insulated from the heatsink. The setup should be conducted without connecting an input or load to the power amplifier.

  1. Check the power supply is operating correctly and verify the rail voltages. Switch the power supply off and check with a multimeter that the rail capacitors have discharged.
  2. Using a multimeter measure the resistance of VR2 and set it for maximum resistance.
  3. Correctly connect the ground lead, the two positive leads plus the negative lead to the power amp module.
  4. Remove the PCB fuses and replace with 100 ohm 5 watt resistors. Connect a multimeter that is set to the 20 volt scale across the positive rail 100 ohm resistor.
  5.  Check that the power supply connections are correct one last time and switch on. If the multimeter reading goes off-scale, turn off immediately and find the problem. Check also the 100 ohm 5 watt resistors; they may have gone open cct.
  6. If everything seems ok adjust VR2 to set the output stage bias current, by measuring the voltage across the positive rail resistor. Adjust for a reading of 4 volts per output FET pair. I.e. For a 6 FET board set for a voltage of 12 volts. This equates to a bias current of 40mA per FET pair or 120 mA total. For the 12 FET board set for a voltage of 24 volts.
  7. If everything seems ok, check the output offset voltage and adjust VR1 to achieve an offset of less than 10 mV. You will need to wait briefly between adjustments for the offset to settle.
  8. All being well switch off, back off the bias control trimmer (VR2) and replace the 100 ohm resistors with 10 ohm 1 watt resistors. Switch on again and re-adjust VR2 to get 0.4 volts per FET pair.
  9. Switch off, remove the resistors and put the fuses back in. Switch on, re-check the offset voltage and adjust with VR1 if necessary.
  10. The amp module is ready, connect the input and output and enjoy.

ACTRK600 @4 ohm sound test

 

BOM circuit Amplifier Actrk400 ACTRK600 Mosfet IRFP460 600W

Parts Value Description Quantity
Resistors
R1,R11 1K 1/4W resistor 2
R2,R15 10 1/4W resistor 2
R3,R13 33K 1/4W resistor 2
R4,R9 3.3K 1/4W resistor 2
R5,R10 220 1/4W resistor 2
R6 33 1/4W resistor 1
R7,R12,R14 27K 1/4W resistor 3
R8,R17,R19,R20 330 1/4W resistor 4
R16,R18 22 1/4W resistor 2
R21 3.3K 2W resistor 1
R22,R23,R24,R25,R26,R27,
R28,R29,R30,R31,R43,R44
27 1/4W resistor 12
R32,R33,R34,R35,R36,R37,
R38,R39,R40,R41,R45,R46
0.33 Cement Resistor 5W 12
VR1 1K (102) 3296W trimpot 1
VR2 50 (500) 3296W trimpot 1
Capacitors
C1 1uF (105) Film capacitor 1
C2,C5 330pF (331) Ceramic Capacitor 2
C3,C4,C11,C12,C14 100nF (104) 250V Ceramic Capacitor 6
C6 100uF/25V Electrolytic capacitor 1
C7 22pF Ceramic Capacitor 1
C9,C8 39pF Ceramic Capacitor 2
C10 47uF/160V Electrolytic capacitor 1
C13 100nF (104) 100V Film capacitor
C15,C16 470uF/200V Electrolytic capacitor 2
Semiconductors
D1,D2,D3,D4,D5 1N4148 DO-35 Switching Diode 5
D6,D7 DZ8.2 8.2V DO-41G Zener Diode 2
U1 +80V Quick connect Cold-pressed Terminal 1
U2 -80V Quick connect Cold-pressed Terminal 1
U3,U5 GND Quick connect Cold-pressed Terminal 2
U6 OUT Quick connect Cold-pressed Terminal 1
U7 +90V Quick connect Cold-pressed Terminal 1
Q5 BC327 PNP TO-92 Bipolar transistor 1
Q1,Q3 2SC1845 NPN TO-92-3 Bipolar transistor 2
Q2,Q4 BC546 NPN TO-92-3 Bipolar transistor 2
Q8,Q7,Q6 MJE350 PNP TO-225-3 Bipolar transistor 3
Q16,Q14,Q13,Q19,Q11,Q15,
Q9,Q20,Q17,Q18,Q12,Q10
IRFP460PBF N-Channel TO-247AC-3 MOSFET 12
Miscellaneous
F1,F2 Fuse 10A Fuseholder + 10A fuse 2
LR1 4uH+4.7 ZOBEL NETWORK COIL 1
H1 IN 1x2P ,P=2.54mm Pin Header 1

Download files, links, and notes

Source: https://oshwlab.com/cmircea2006/amplifier-actrk600

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Xtronic.org blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.
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