BOM
R1
2M2
R2
150K
R3
1M
R4
470K
R5
1K
R6
56K
R7
10K
R8
1M
R9
56K
R10
10K
R11
1M
R12
10K
R13
56K
R14
56K
R15
56K
R16
56K
R17
56K
R18
56K
R19
1M
R20
56K
R21
56K
R22
56K
R23
330R
R24
1M
R25
100K
R26
10K
R27
390R
RLED
2K2 (CLR)
C1
10n
C2
1n
C3
330p
C4
10u elec
C5
47n
C6
47n
C7
10n
C8
1u elec
C9
1u elec
C10
100u elec
C11
10u elec
C12
100u elec
C13
100n
C14
220n
D1-3
1N4148
IC1
4558
IC2
CD4013
Q1-3
2N3904
Q4
2N5088
BLEND
50KA
VOL
100KA
SW1
SPDT (ON-ON)
Schematic
Green shaded area is a LPB
boost circuit to bring the
signal level up to above
unity. This isn’t in the
original circuit.
The switch selects between
2-octaves down (original)
and 1-octave down (mod).
