God City Instruments – Socialist Jr. V1.0 Build Guide
2
Part
Value
Description
Substitute
Substitution Notes
C1
0.22u
film cap
0.1-‐1u
Forms HPF with R13. Bigger = more bass/mud.
C2
0.1u
MLCC
C3
2.2n
film cap
1n-‐4.7n
Forms input LPF with R1. Bigger = mud, smaller = possible RF.
C4
22n
film cap
C5
100u
electrolytic cap
47u-‐220u
Power filter cap
C6
100u
electrolytic cap
47u-‐220u
Power filter cap
C7
0.22u
film cap
0.1u-‐0.47u
Forms HPF with R16. Bigger = more bass/mud.
C8
330p
MLCC
Smoothes high frequencies related to clipping of second stage.
C9
10n
film cap
C10
22n
film cap
C11
270p
MLCC
C12
0.22u
film cap
C13
1n
film cap
470p-‐2.2n
Switchable system LPF
C14
270p
film cap
100p-‐470p
System LPF
C15
22n
film cap
10n-‐47n
Forms HPF with R15 and Response. Bigger = more mud.
C16
0.1u
film cap
C17
1u
film cap
C18
1u
film cap
C19
270p
MLCC
100p-‐1n
Smoothes high frequencies related to clipping of first stage.
C20
100p
MLCC
C21
220p
MLCC
D1
Red
3mm LED
D2
Yellow
3mm LED
D3
1n4148
Si diode
D4
1n4148
Si diode
D5
1n4148
Si diode
D6
1n34a
Ge diode
D7
1n5818
Scottky diode
1n5817, 1n4001
Any suitable polarity protection diode
LED
L1
LED
IC1
MC1458
dual op amp
TL072, TLC2272, LM833
Pin compatible dual op amp
IC2
TL072
dual op amp
TLC2272, NE5532, OPA2132
Pin compatible dual op amp
CLR
4.7k
1/4 watt resistor
R1
10k
1/4 watt resistor
R2
2.2M
1/4 watt resistor
R3
10k
1/4 watt resistor
R4
10k
1/4 watt resistor
R5
1M
1/4 watt resistor
R6
1M
1/4 watt resistor
R7
10k
1/4 watt resistor
R8
10k
1/4 watt resistor
R9
12k
1/4 watt resistor
R10
22k
1/4 watt resistor
R11
68k
1/4 watt resistor
47k-‐120k
Affects mid frequency. Lower value = lower frequency.
R12
100k
1/4 watt resistor
4.7k-‐33k
Affects output volume. Smaller = more volume. May cause clipping
R13
6.8k
1/4 watt resistor
4.7k-‐10k
Affects gain and bass in 2nd stage. Smaller = brighter and gainier.
R14
12k
1/4 watt resistor
R15
1.2k
1/4 watt resistor
R16
12k
1/4 watt resistor
R17
10k
1/4 watt resistor
R18
4.7k
1/4 watt resistor
R19
100k
1/4 watt resistor
12k-‐220k
Affects output volume. Bigger = more volume. May cause clipping
R20
12k
1/4 watt resistor
R21
10R
1/4 watt resistor (carbon)
CLIP
SPDT.PINS
on/off/on
3 position switch!
MID
DPDT.PINS
on/on
2 position switch!
DARK
SPDT.PINS
on/on
3 position switch!
