Hi bucks bunny, I would say the opposite 😉 . The opamps with their extremely complex circuitry and high NFB, is what to be avoided. The FET-buffer is the same as I am using in the active filters and is needed for the 60Hz HP filter.
The FET-buffer adds distortion and is superfluous.
There is no evidence for this claim.
Why waste an output stage? Turn it into PBTL and have double the current to drive woofers. Can drive 2ohm loads.
Hey sorry I missed the fine point about your SE drive on one end.
Perhaps you could use something similar to my two transistor balanced output drive and then use both inputs
I used BJTs but probably can be done with MOSFETs. Idea is to use the drive above and below an output device for opposing drive voltages out.
Scope output shows very even balanced split.
Perhaps you could use something similar to my two transistor balanced output drive and then use both inputs
I used BJTs but probably can be done with MOSFETs. Idea is to use the drive above and below an output device for opposing drive voltages out.
Scope output shows very even balanced split.
Yes, the old Paraphase/Concertina phase splitter is a great performer. Also acts as an 1:1+1 transformer. This is how it could be used as a SE to BAL stage for the TPA3255. If +/-24V was available a 2SK170 would work fine without any 8-legged critters in the signal chain.
The question was actually about how to deal with the unused INPUT_B/OUT_B.
Got some indications from bunny and then got it verified from the guys at Ti.
Direct input from the DSP and via a simple buffer for the 60Hz filter into the SE.
The two cascaded 60Hz filters forms a 2nd LR.
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