hello everybody,
I'm on the way of building a big A5 to drive the midrange/highs of my Lxminis and I have some questions.
I've already populated the boards:
I mounted the irf9610s on an aluminum plate to keep them thermo-coupled.
I substituted R14 220K for a 500K trimmer in order to fine tune the Bias.
Here's the schematic:
Now I'm planning my PSU, here's the CRC schematic I choose:
There will be two of those PSUs for a stereo amp.
The caps are Hitachi FA 22000uf 80V screw type.
The PSU seems to behave well under PSUdesigner (34,11VDC under a constant 4.4A draw), but I'm not sure about the bleeders value.
I'm also looking for an adequate chassis, seems like a Modushop Dissipante 5U 400mm may be good, as each heatsinks (two per channel) are rated to 0.28c/W (witch gives 0.14c/W per channels).
For 150W dissipation per channel with an ambient temperature of 25°c I get:
25/150= 0.166 then with a 25% de-rating 0.166/1.25 =0.133c/W
With the addition of the 10mm aluminum front plate and the different covers I may be just good.
Am I right?
I will also add a soft-start:
My last question will be about setting the bias, I know that the bias is set through R14 and the source resistor, but to workout any mismatch I put a trimmer in place of the r14 220K res (set to 220k value before soldering). I will mesure the bias across one of the source resistors but witch value should I look after?
I'm on the way of building a big A5 to drive the midrange/highs of my Lxminis and I have some questions.
I've already populated the boards:
I mounted the irf9610s on an aluminum plate to keep them thermo-coupled.
I substituted R14 220K for a 500K trimmer in order to fine tune the Bias.
Here's the schematic:
Now I'm planning my PSU, here's the CRC schematic I choose:
There will be two of those PSUs for a stereo amp.
The caps are Hitachi FA 22000uf 80V screw type.
The PSU seems to behave well under PSUdesigner (34,11VDC under a constant 4.4A draw), but I'm not sure about the bleeders value.
I'm also looking for an adequate chassis, seems like a Modushop Dissipante 5U 400mm may be good, as each heatsinks (two per channel) are rated to 0.28c/W (witch gives 0.14c/W per channels).
For 150W dissipation per channel with an ambient temperature of 25°c I get:
25/150= 0.166 then with a 25% de-rating 0.166/1.25 =0.133c/W
With the addition of the 10mm aluminum front plate and the different covers I may be just good.
Am I right?
I will also add a soft-start:
My last question will be about setting the bias, I know that the bias is set through R14 and the source resistor, but to workout any mismatch I put a trimmer in place of the r14 220K res (set to 220k value before soldering). I will mesure the bias across one of the source resistors but witch value should I look after?
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