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6 MILLION GAIN

This circuit is so sensitive it will detect "mains hum." Simply move it across any wall and it will detect where the mains cable is located. It has a gain of about 200 x 200 x 200 = 6,000,000 and will also detect static electricity and the presence of your hand without any direct contact. You will be amazed what it detects! There is static electricity EVERYWHERE! The input of this circuit is classified as very high impedance.

This amplifier circuit based on the ic, and the use here is that where ic STK4017 IC has output power of 6.5 watts with the impedance 8Ohm. Minimum required supply voltage and maximum 20Volt 35 Volt DC.

Component
R1 = 100K
R2 = 2K7
R3 = 27R
C1 = 22uF
C2 = 100uF
C3 = 100uF
C4 = 100uF
C5 = 100uF
C6 = 47uF
C7 = 330uF
C8 = 100uF
U1 = STK4017
Besides using STK4017 ic, ic and can use that I mentioned the following:
STK4019
STK4021
STK4023
STK4025