Quad 405 with current dumping
Typo correction. (not very clear on the schematic):
The famous bridge consists of R36, L2, C8, R20||R21.
R36 = 47R;
L2 = 3uH;
C8 = 120pF;
R20||R21 = 500R.
Note that op-amp IC1 is firtually out of the GNFB loop. It is only as a
preamp with gain of 15 and for DC stabilisation.
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