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C828 Tone Control with PreAmp Mic Circuit

This is tone control mono circuit with pre amp mic schematic diagram :

C828 Tone Control with PreAmp Mic Circuit
Component List :
Resistor : R1,R2 =5K6 R3,R5,R11,R19=10K R4,R14=330K R6,R7,R8,R9=50K R10=2K2 R12,R13=1K R15=15K R16=4K7 R17=33K R18=86K R20=100K
Capacitor : C1=100uF/35V C2=47uF/35V C3,C4,C5,C6=1uF/50V C7=100n C8=22n C9=2n2
Transistor : Q1,Q2 = C828
Power Supply : + - 12V DC

Working and Tested For Power Amplifier TDA2003 , and it is cheap to buy component and very simple.
See image below :
Tone Control Schematic
Tone Control with Pre Amp Mic  Component Assembly
Tone Control Circuit
Tone Control PCB

TDA2003 Power Amplifier
TDA2003 Audio Power Amplifier
Very Cheap and Simple Power Audio Speaker Active
Speaker Active with Tone Control C828 include Pre Amp Mic , using 2Amp Transformer , 6inch Woofer Speaker

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  7. Also, R18-86K it's not a standard value, maybe 56K or 82K?