God City Instruments – HM-1 V1.0 Build guide
2
Part
Value
Description
Substitute
Substitution Notes
C1
270p
MLCC
C2
0.1u MLCC
MLCC
C3
100u
electrolytic cap
C4
0.1u
film cap
C5
47n
film cap
10n-100n
affects input HPF along with R6
C6
0.1u
film cap
C7
270p
MLCC
100p-470p
affects high freq of first stage
C8
0.22u
film cap
0.1u-0.47u
affects HPF of gain stage along with
R13
C9
0.47u
film cap
C10
1n
film cap
C12
100u
electrolytic cap
C13
68n
film cap
C14
6.8n
film cap
C15
1u
film cap
C16
4.7n
film cap
C17
0.15u
film cap
C18
0.1u
film cap
C19
33n
film cap
C20
0.1u
film cap
C21
1u
film cap
C22
1.5u
film cap
C23
470p
MLCC
LED
L1
3mm LED
D1
1n4148
small signal diode
1n456a, 1n914, 1n5818, mosfet
clipping diode
D2
1n4148
small signal diode
1n456a, 1n914, 1n5818, mosfet
clipping diode
D3
1n4148
small signal diode
1n456a, 1n914, 1n5818, mosfet
clipping diode
D4
bat41
small signal diode
1n456a, 1n914, 1n5818, mosfet
clipping diode
D5
bat41
small signal diode
1n456a, 1n914, 1n5818, mosfet
clipping diode
D6
1n5818
schottky diode
1n5817, 1n4001
reverse polarity protection
IC1
RC4558
dual op amp
TL072, MC1458
IC2
TL072
dual op amp
TLC2272, NE5532
IC3
TL074
quad op amp
TLC2274, LMC6484
Q1
2N5088
NPN BJT
2n3904, 2n4401, BC550
check pinouts (BC550 is backwards)
Q2
2N5088
NPN BJT
2n3904, 2n4401, BC550
check pinouts (BC550 is backwards)
CLR
4.7k
1/4 watt resistor
R1
4.7k
1/4 watt resistor
R2
47k
1/4 watt resistor
R3
100k
1/4 watt resistor
R4
2.2M
1/4 watt resistor
1M-10M
input pull down resistor
R5
1k
1/4 watt resistor
R6
470k
1/4 watt resistor
270k-1M
affects input HPF along with C5
R7
10k
1/4 watt resistor
R8
10k
1/4 watt resistor
R9
470k
1/4 watt resistor
