This circuit was published in a 1977 English magazine, but remains current, since we can assemble it with BC558 transistor instead of Q2, BC548 instead of Q1 and Q3, BD136 instead of Q5 and Q7 and using a hair source minus 1.2 A. The output power will be around 10 W and the input resistance will be 1.5 Mohm with 180 mV sensitivity.
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