Are there 68 pairs of OPS transistors?
What load are you aiming to drive, and with what voltage 350V?
Where is the local capacitance for the output stage?
What PCB track width?
What load are you aiming to drive, and with what voltage 350V?
Where is the local capacitance for the output stage?
What PCB track width?
Yes, there is 34 pairs (68 pcs) of transistors.
For start I will use 1Ohm load (4 speaker 300W/4Ohm in parallel). I don't need the capacitance for output stage and the PCB width is 18.5 cm.
This project was a madness, but a practical madness because i have a one meter long heatsink and i didn't wanted to cut it.
So some 3KW RMS?
Nice 🙂
At least you have the muscle to drive those speakers.
Now you need a PSU .
I guess you are forced to SMS because an EI power transformer would be murder ... but it's your choice 🙂
Nice 🙂
At least you have the muscle to drive those speakers.
Now you need a PSU .
I guess you are forced to SMS because an EI power transformer would be murder ... but it's your choice 🙂
Ah, OK...
I just saw +/-90V rails and 32A fuses in your schematic...
You plan to use a regulated PSU and take the regulator feedback from the output stage collectors?
I will use two ETD59 in parallel - MicrosiM topology, but adapted to satisfy my requirements...
No, I wouldn't use that but I will try to create a interdependence between the amplifier output and the PSU shut down when appear a continuous current on speaker terminal.
I was advised to use for continuous component a bootstrap circuit, but I have many questions about it.
For switching power on I will use soft start in SMPS (see SG3525 has this function). In that moment the speaker will be off because the DC protection from output amplifier have a 8 seconds temporisation .
That's all for now, I don't know what will be in future (we see in tests all the disadvantages and advantages).
PS: Sorry for my bad english, I am not a native speaker .
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