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QUAD405 current dump
This KIT is designed 30 years ago,it amuses a lot of people.
I think in the original Quad405,LM301 is not a fast OP.
So,the C8 120pf capacitor used here as the feedforward network.
the high frequency part of signal went stright into the current dumper(push/pull pair transisters).bypass the Tr3-Tr5,Tr7 transisters.
47ohm and L2 3uH，together with R5, as feedback（current parallel negative feedback ）.
so,the total gain is Io="A"*Ii,current dump to the speaker.
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