Schematic, layout and BOM
R1
1M
R2
10M
R3
1K
R4
56K
R6
2K7
R7
100K
R8
100K
R9
470R
R10
10K
C1
100n
C2
47p
C3
4u7 elec
C4
1u elec
C5
15u elec
IC
TL061*
D1
1N4001
VOL
500KC
*Other single op-amps
will work, such as TL071
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