God City Instruments – Decker V1.0 Build Guide
2
Part
Value
Description
Substitute
Substitution Notes
C1
0.47u
Film cap
See Duncan TSC
C2
47n
Film cap
10n-0.1u
Input cap. Forms HPF with R9.
C3
100u
Electrolytic cap
C4
0.1u
Film cap
C5
100u
Electrolytic cap
C6
1u
Film cap
C7
4.7n
Film cap
See Duncan TSC
C8
0.33u
Film cap
See Duncan TSC
C9
2.2n
Film cap
1n-4.7n
Forms input LPF with R10.
C10
0.1u MLCC
MLCC
C11
100p
MLCC
220p-1n
Raise if using smaller R4 values.
C12
1u
Film cap
LED
L1
LED
D1
1n5818
Schottky diode
1n5817, 1n4001, bat41
Any suitable protection diode for 9v.
IC
LM833
Dual Op Amp
TL072, OPA2134, etc
Any pin compatible dual op amp
CLR
4.7k
1/4 watt resistor
1k-10k
Current limiting resistor for LED
R1
1M
1/4 watt resistor
2.2M
Pull down resistor
R2
10k
1/4 watt resistor
R3
10k
1/4 watt resistor
R4
10k
1/4 watt resistor
1k-47k
Lower for more output gain and op amp clipping.
R5
10k
1/4 watt resistor
1k-47k
Lower for more input gain and op amp clipping.
R6
100k
1/4 watt resistor
R7
1k
1/4 watt resistor
R8
10k
1/4 watt resistor
R9
1M
1/4 watt resistor
R10
10k
1/4 watt resistor
R11
100k
1/4 watt resistor
TREBLE
B25k
Potentiometers
See Duncan TSC
BASS
A100k
Potentiometers
See Duncan TSC
MID
B5k
Potentiometers
See Duncan TSC
SLOPE
A10k
Potentiometers
See Duncan TSC
TRIM
A100k
Potentiometers
S
PAD
Send to PCB
L+
PAD
LED+
L-
PAD
LED-
R
PAD
Return from PCB
V
PAD
9v input
G
PAD
Ground
