Hi All,
Is there anyone that can help me design a simple replacement to the voltage amplifier in the Pioneer VSX-54TX/56TXi? I can do the PCB layout but I don't have the skills needed to design the circuit.
These AVR use black module that is soldered into the power amp board just before the high current mosfet stage. You can see the design here:
The HIC PA9009A is the stock module. I was hoping someone could make me something that improves upon the original design but using J-FETS. I have a small budget if that helps.
Is there anyone that can help me design a simple replacement to the voltage amplifier in the Pioneer VSX-54TX/56TXi? I can do the PCB layout but I don't have the skills needed to design the circuit.
These AVR use black module that is soldered into the power amp board just before the high current mosfet stage. You can see the design here:
The HIC PA9009A is the stock module. I was hoping someone could make me something that improves upon the original design but using J-FETS. I have a small budget if that helps.
@Nelson Pass is there any design I could use of yours that could drop in here? I'd be grateful of any advice.
It's late in the game I know, but the vsx-52tx HAS the PA9010a, which is already fet from beginning to end:
No, that is not the correct drawing for that chip. It is not a APEX 9010 IC. The PA9010A is a custom SIP like the PA9009A IC,HYBRID BX9164
I would expect it to be very similar to each other based on the topology of driving the PDB001/PDB002 mosfet devices although the service manuals do not show the internal design for the PA9010A like they do for PA9009A. My original question was to convert the bipolar drivers in these IC to JFET. However, either this is too complicated or offers no benefits over the bipolar design. There is no one interested in assisting me here. I don't know so I have given up the idea. I have since started building JLH and Pass PLH boards to see if they sound any better than the Pioneer VSX-56Txi. I recently got new speakers which are around 96dB/W sensitive so I don't need gobs of power now but still want to keep the VSX for my home theater use.
I would expect it to be very similar to each other based on the topology of driving the PDB001/PDB002 mosfet devices although the service manuals do not show the internal design for the PA9010A like they do for PA9009A. My original question was to convert the bipolar drivers in these IC to JFET. However, either this is too complicated or offers no benefits over the bipolar design. There is no one interested in assisting me here. I don't know so I have given up the idea. I have since started building JLH and Pass PLH boards to see if they sound any better than the Pioneer VSX-56Txi. I recently got new speakers which are around 96dB/W sensitive so I don't need gobs of power now but still want to keep the VSX for my home theater use.
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