Can you elaborate? Is the design itself accounting for this view or do you find that output coils are generally unnecessary?
An output coil is required. I just changed the design. Instead of the classic air coil, I started using the inductance of the wire that connects the amplifier board and the output terminal of the chassis. The amplifier is also designed so that 0.1uH inductance is sufficient for stability. ( PM > 60 deg, GM > 15dB, stable into 15nF II 4R load without coil).
IMHO, If you are aiming for the -120dB thd level, it is better to have the coil outside the amp pcb.
IMHO, If you are aiming for the -120dB thd level, it is better to have the coil outside the amp pcb.
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LKA, if I want to add one more pair of output devices, do I need to increase drivers/predrivers current?
25mA seems like enough for 3 pairs or even 4?
Are you sure 2 pairs will handle 200W at 4 Ohms?
25mA seems like enough for 3 pairs or even 4?
Are you sure 2 pairs will handle 200W at 4 Ohms?
yes, you can add one more pair.
sure, two pairs of IRFP240/9240 can handle 200W/4R (no secondary breakdown, DC SOA 100V 1,5A )
sure, two pairs of IRFP240/9240 can handle 200W/4R (no secondary breakdown, DC SOA 100V 1,5A )
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I don't know if this is relevant, but sigma-delta audio ADCs often have the noise increase quickly above 20 kHz.
