i still not install.i only want try first.if it work.i will cut the heatsink
I need pictures with PSU and wireing, I can't see enough for help you, give some informations about rail voltages, do you use 10R resistors instead fuses for bias setup?
If you add one or more pairs of outputs no need to change rail voltage, exsept you want more power...
Regards
yes.i want add 1 more pair output.and want more power.what voltage rail should i give?and bias adjust still 4.7v?
For bias adjust use 10R instead fuses and set 1V on them for single pair or 2V for two pairs. I suggest rail voltage +/-45V for single pair or +/-55V for two pairs (+/-65V 3 pairs, +/-75V 4 pairs, +/-85V 5 pairs and +/-95V 6 pairs or more).
DC offset is about +/-10mV.
Regards
This is amp for 'Home Audio', but can be use for PA applications with short circuit protection from 'DC Servo Mosfet Amp' PSU.
Regards
expect a +-75Vdc supply to sag between 5V and 10V depending on how you build the PSU.
Expect the amplifier to drop/lose another 5V before it feeds the output.
Combining these two losses, expect ~60Vpk at the output.
P = Vpk^2 / Rload / 2
225W into 8r0, 450W into 4r0.
Work all the other impedances out from this model.
If you want 225W into 8r0 from it, then expect to provide 900W of mosFET output stage or 1200W of BJT output stage.
If you want/need to drive 4ohms speaker then double the wattage of the output stage.
Expect the amplifier to drop/lose another 5V before it feeds the output.
Combining these two losses, expect ~60Vpk at the output.
P = Vpk^2 / Rload / 2
225W into 8r0, 450W into 4r0.
Work all the other impedances out from this model.
If you want 225W into 8r0 from it, then expect to provide 900W of mosFET output stage or 1200W of BJT output stage.
If you want/need to drive 4ohms speaker then double the wattage of the output stage.
Last edited:
why do we need 900watt of mosfet output stage for 225watt into 8 ohms
i didn't understand your answer