HM-2 Heavy Metal

effect pedal project by BOSS

Here's the HM-2 Heavy Metal effect pedal project from BOSS.

This project has been described using terms like boss, distortion, stripboard, and vero and is reportedly verified, meaning many hobbyists have already completed this project and verify that the instructions are without issue.

Beyond the specs and details found on this page, you'll want to check out these stripboard resources too.

Project Resources

Parts List

  • C1
    47n
  • C2
    470p
  • C3
    10u
  • C4
    68n
  • C5
    1u
  • C6
    10u
  • C7
    47n
  • C8
    47u
  • C9
    1n
  • C10
    47n
  • C11
    47u
  • C12
    220u
  • C13
    1u5
  • C14
    47n
  • C15
    1u
  • C16
    4u7
  • C17
    6n8
  • C18
    150n
  • C19
    100n
  • C20
    100p
  • C21
    100p
  • C22
    100p
  • D1
    1N4148
  • D2
    1N4148
  • D3
    1N4148
  • D4
    1N4148
  • D5
    1N4148
  • D6
    1N34A
  • D7
    1N34A
  • D8
    1N5817
  • P1
    250k Distortion
  • P2
    10k Low
  • P3
    10k High
  • P4
    10k Volume
  • Q1
    M5216L
  • Q2
    M5216L
  • Q3
    M5216L
  • R1
    150R
  • R2
    68k
  • R3
    100k
  • R4
    1M
  • R5
    47k
  • R6
    3k3
  • R7
    10k
  • R8
    1M
  • R9
    1k
  • R10
    3k3
  • R11
    330R
  • R12
    10k
  • R13
    10k
  • R14
    22k
  • R15
    10k
  • R16
    82k
  • R17
    100k
  • R18
    470k
  • R19
    100k
  • R20
    10k
  • R21
    10k
  • R22
    22R
  • R23
    68k
  • R24
    330R
  • R25
    470k
  • R26
    220k
  • R27
    10k
  • R28
    100k
  • R29
    330R
  • R30
    120R
  • R31
    22k
  • R32
    10k
  • T1
    BF245
  • T2
    2SC2240
  • T3
    2SA970
  • U1
    9V

Similar transistors & Potential Alternatives

Can't find an exact match for the recommended transistors in this project within your stash? Or maybe you just feel like experimenting. Use these tables below to get started finding a suitable or otherwise interesting transistor substitution.

There may be 30 alternatives for the 2SC2240 mentioned above in the parts list for this project. These suggestions were derived by considering the original component's hFE, Pol, Ic, Vcb, and Vce values and finding comparables in our database. These alternatives are suggestions for further exploration (fun!) and have not been tested in the context of this project. The first 25 alternatives are shown below in alphabetical order by partnumber. See the to suit your preferences.

2SC2240
more info
Cc
3
pF
ft
50
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC2240GR
more info
Cc
3
pF
ft
50
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC2316
more info
Cc
30
pF
ft
120
MHz
hFE
200
β
Ic
0.8
A
Pc
0.9
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC2459
more info
Cc
3
pF
ft
50
MHz
hFE
200
β
Ic
0.1
A
Pc
0.2
W
Pol
NPN
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC2459GR
more info
Cc
3
pF
ft
50
MHz
hFE
200
β
Ic
0.1
A
Pc
0.2
W
Pol
NPN
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC2713
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
NPN
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC2713-GR
more info
Cc
3
pF
ft
100
MHz typ
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
NPN
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC2713GR
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
NPN
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC3324GR
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SC4117
more info
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.2
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
2SC4117GR
more info
Cc
3
pF
ft
100
MHz typ
hFE
200
β
Ic
0.1
A
Pc
0.2
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SD574
more info
ft
3
MHz
hFE
200
β
Ic
30
A
Pc
400
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
4
V
2SD574A
more info
ft
3
MHz
hFE
200
β
Ic
30
A
Pc
400
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
4
V
3DG2240
more info
Cc
3
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
CSC2240
more info
Cc
3
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
CSC2240GR
more info
Cc
3
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
CSC2713
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
NPN
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
CSC2713G
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
NPN
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
FTC3200
more info
Cc
3
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.625
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
H3200
more info
Cc
3
pF
ft
100
MHz typ
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
HN3C51F
more info
Cc
3
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
HN4C06J
more info
Cc
3
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
HN4C51J
more info
Cc
3
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
KTC3911S
more info
Cc
4
pF
ft
10
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
NPN
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
MJ11016G
more info
ft
4
MHz
hFE
200
β
Ic
30
A
Pc
200
W
Pol
NPN
Tj
200
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V

There may be 28 alternatives for the 2SA970 mentioned above in the parts list for this project. These suggestions were derived by considering the original component's hFE, Pol, Ic, Vcb, and Vce values and finding comparables in our database. These alternatives are suggestions for further exploration (fun!) and have not been tested in the context of this project. The first 25 alternatives are shown below in alphabetical order by partnumber. See the to suit your preferences.

2SA970
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SA970GR
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SA1049
more info
Cc
220
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.2
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SA1049GR
more info
Cc
220
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.2
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SA1163
more info
ft
100
MHz
hFE
200
β
Ic
0.15
A
Pc
0.15
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
2SA1163GR
more info
Cc
4
pF
ft
100
MHz typ
hFE
200
β
Ic
0.1
A
Pc
0.2
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SA1312
more info
Cc
4
pF
ft
110
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SA1312GR
more info
Cc
4
pF
ft
110
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SA1335
more info
ft
100
MHz typ
hFE
200
β
Ic
0.1
A
Pc
0.2
W
Pol
PNP
Tj
135
°C
TranMat
Si
Vcb
120
V
Vce
120
V
2SA1587GR
more info
Cc
4
pF
ft
100
MHz typ
hFE
200
β
Ic
0.1
A
Pc
0.1
W
Pol
PNP
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SB806
more info
Cc
17
pF
ft
35
MHz
hFE
200
β
Ic
0.7
A
Pc
2
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SB806-KP
more info
Cc
14
pF
ft
75
MHz typ
hFE
200
β
Ic
0.7
A
Pc
2
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
2SB806KP
more info
Cc
17
pF
ft
35
MHz
hFE
200
β
Ic
0.7
A
Pc
2
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
3CG970
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
A970
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
A1163
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
A1517
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.15
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
CSA970
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
CSA970GR
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
FJX992
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.235
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
FTA1268
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.625
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
H1268
more info
Cc
4
pF
ft
100
MHz typ
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
HN2E04F
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
125
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
HN3A51F
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V
HN4A06J
more info
Cc
4
pF
ft
100
MHz
hFE
200
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
150
°C
TranMat
Si
Vcb
120
V
Vce
120
V
Veb
5
V