Hello All,
I would like to run a two PCB solution. Not the classic input stage and output stage variety. I would like to run a full amplifier on one PCB with a second PCB above with another set of output transistors. This is because it would make better use of the space I have to install it in. And be cheaper with regards to PCB cost.
One issue I can think of is thermal. However, the heatsinks are massively over rated so total dissipation would not be an issue. But the lower transistors would run cooler than the upper set. Is this really an issue? Would there be any other thermal issues?
Another option, as this is going to be 4 channel amp is to run the extra transistors to the sides and have one full amplification channel mounted above the other. Two channels on one heatsink.
Thermal issues aside. Would it best to have a complete output on the "daughter board" or just the output transistors or something in between?
This may seem a basic question but there may some details I haven't considered.
Schematic obviously massively simplified 😉
Thank you for your time.
Paul
I would like to run a two PCB solution. Not the classic input stage and output stage variety. I would like to run a full amplifier on one PCB with a second PCB above with another set of output transistors. This is because it would make better use of the space I have to install it in. And be cheaper with regards to PCB cost.
One issue I can think of is thermal. However, the heatsinks are massively over rated so total dissipation would not be an issue. But the lower transistors would run cooler than the upper set. Is this really an issue? Would there be any other thermal issues?
Another option, as this is going to be 4 channel amp is to run the extra transistors to the sides and have one full amplification channel mounted above the other. Two channels on one heatsink.
Thermal issues aside. Would it best to have a complete output on the "daughter board" or just the output transistors or something in between?
This may seem a basic question but there may some details I haven't considered.
Schematic obviously massively simplified 😉
Thank you for your time.
Paul
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Given how finicky EF3s can be, I would rather not duplicate one as shown. Instead, I'd make a single output stage using 4 output pairs and spread out only those, using low-inductance connections.
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