God City Instruments – Bass Brutalist V1.2 Build Guide
2
Part
Value
Description
Substitute
Subtitution Notes
C1
3.3n
Film cap
1n - 4.7n
Input LPF
C2
47n
Film cap
10n-100n
Input cap
C3
100u
Electrolytic cap
47u-220u
Power filtering
C4
22n
Film cap
10n-47n
First gain stage HPF 1
C5
0.1u
Film cap
47n-220n
First gain stage HPF 2
C6
220p
MLCC
100p-470p
First gain stage LPF
C7
1uF
Film cap
C8
100p
MLCC
see build guilde
LPF EQ stage. 2.2n makes for 1kHz peak
C9
68n
Film cap
C10
330p
MLCC
100p-680p
Second gain stage LPF
C11
0.1u
Film cap
C12
0.1u
MLCC
C13
100u
Electrolytic cap
47u-220u
Power filtering
C14
22u
Electrolytic cap
see build guilde
Tone cap - dark
C15
22n
Film cap
Tone cap - bright
IC1
OPA2134
Dual op amp
NE5532, TLE2072, AD712
Pin compatible dual op amp
IC2
OP07
Single op amp
LM308, LM741, TL071
Pin compatible single op amp
D1
3mm LED
Red LED
Yellow, green, MOSFET,
diode
Clipping diode
D2
3mm LED
Yellow LED
Red, green, MOSFET,
diode
Clipping diode
D3
1n5818
Schottky diode
1n4001, bat41
Any protection diode suitable for 9v
LED
3mm LED
LEDs, all sizes
CLR
4.7k
1/4 watt resistor
R1
2.2M
1/4 watt resistor
R2
10k
1/4 watt resistor
R3
2.2M
1/4 watt resistor
R4
10k
1/4 watt resistor
1k-22k
Affects first stage HPF 2 and gain
R5
33k
1/4 watt resistor
22k-68k
Affects first stage HPF 1 and gain
R6
120k
1/4 watt resistor
82k-220k
Affects first gain stage. More is more
R7
2.7k
1/4 watt resistor
1.5k-4.7k
Affects gain of second stage. Less is more
R8
47k
1/4 watt resistor
see build guilde
Affects gain of output stage
R9
120k
1/4 watt resistor
Affects gain of output stage
R10
10k
1/4 watt resistor
R11
10k
1/4 watt resistor
R12
68k
1/4 watt resistor
R13
2.2k
1/4 watt resistor
see build guilde
R14
3.3k
1/4 watt resistor
R15
2.7k
1/4 watt resistor
1k-10k
Sets minimum for gain pot
R16
1K
1/4 watt resistor
DIST
A100K
16mm potentionmeter
A50k, A250k
Affects gain of second stage
TONE
B100k
16mm potentionmeter
LEVEL
A100K
16mm potentionmeter
A50k
Output volume
S
PAD
Send to PCB
L+
PAD
LED+
L-
PAD
LED-
R
PAD
Return from PCB
V
PAD
9v input
G
PAD
Ground
