Selectatone

effect pedal project by Hornby Skewes

Here's the Selectatone effect pedal project from Hornby Skewes.

This project has been described using terms like booster, hornby skewes, and stripboard 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
    100n
  • C2
    100u
  • C3
    100n
  • C4
    100n
  • C5
    1n
  • R1
    2k2
  • R2
    100k
  • R3
    10k
  • R4
    10k
  • R5
    1k
  • R6
    10k
  • R7
    100k
  • S1
    DPDT
  • T1
    OC71
  • U1
    9V

Similar transistors & Potential Alternatives

Can't find an exact match for the recommended transistor 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 73 alternatives for the OC71 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.

OC71
more info
Cc
30
pF
ft
0.3
MHz
hFE
30
β
Ic
0.01
A
Pc
0.125
W
Pol
PNP
Tj
80
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
Veb
10
V
2G301
more info
Cc
12
pF
ft
3
MHz
hFE
30
β
Ic
0.3
A
Pc
0.2
W
Pol
PNP
Tj
100
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
Veb
10
V
2G320
more info
Cc
50
pF
ft
1
MHz
hFE
30
β
Ic
0.2
A
Pc
0.2
W
Pol
PNP
Tj
85
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
Veb
3
V
2N1452
more info
Cc
40
pF
ft
1
MHz
hFE
30
β
Ic
0.4
A
Pc
0.2
W
Pol
PNP
Tj
80
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
2N3209
more info
Cc
5
pF
ft
400
MHz
hFE
30
β
Ic
0.2
A
Pc
0.36
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N3209AQF
more info
Cc
5
pF
ft
400
MHz
hFE
30
β
Ic
0.2
A
Pc
1.5
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N3209CSM
more info
Cc
5
pF
ft
400
MHz
hFE
30
β
Ic
0.2
A
Pc
0.36
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N3209DCSM
more info
Cc
5
pF
ft
400
MHz
hFE
30
β
Ic
0.2
A
Pc
0.75
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N3209L
more info
Cc
5
pF
ft
400
MHz
hFE
30
β
Ic
0.2
A
Pc
0.36
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N3209X
more info
Cc
5
pF
ft
400
MHz
hFE
30
β
Ic
0.2
A
Pc
1.2
W
Pol
PNP
Tj
200
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N3209XCSM
more info
Cc
5
pF
ft
400
MHz
hFE
30
β
Ic
0.2
A
Pc
0.3
W
Pol
PNP
Tj
200
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N3218
more info
Cc
14
pF
ft
1
MHz
hFE
30
β
Ic
0.1
A
Pc
0.4
W
Pol
PNP
Tj
200
°C
TranMat
Si
Vcb
20
V
Vce
20
V
2N5142
more info
Cc
10
pF
ft
100
MHz
hFE
30
β
Ic
0.5
A
Pc
0.3
W
Pol
PNP
Tj
125
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N5143
more info
Cc
10
pF
ft
100
MHz
hFE
30
β
Ic
0.5
A
Pc
0.3
W
Pol
PNP
Tj
125
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2N5910
more info
Cc
3
pF
ft
700
MHz
hFE
30
β
Ic
0.1
A
Pc
0.2
W
Pol
PNP
Tj
125
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
2SA345
more info
Cc
2
pF
ft
125
MHz
hFE
30
β
Ic
0.01
A
Pc
0.06
W
Pol
PNP
Tj
85
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
2SA346
more info
Cc
2
pF
ft
125
MHz
hFE
30
β
Ic
0.01
A
Pc
0.06
W
Pol
PNP
Tj
85
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
2SA347
more info
Cc
2
pF
ft
125
MHz
hFE
30
β
Ic
0.01
A
Pc
0.06
W
Pol
PNP
Tj
85
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
2SA460
more info
Cc
2
pF
ft
200
MHz
hFE
30
β
Ic
0.01
A
Pc
0.06
W
Pol
PNP
Tj
85
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
2SA461
more info
Cc
2
pF
ft
200
MHz
hFE
30
β
Ic
0.01
A
Pc
0.06
W
Pol
PNP
Tj
85
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
2SA462
more info
Cc
2
pF
ft
200
MHz
hFE
30
β
Ic
0.01
A
Pc
0.06
W
Pol
PNP
Tj
85
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
2SA741
more info
ft
100
MHz
hFE
30
β
Ic
0.1
A
Pc
0.3
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
6
V
2SA741H
more info
ft
200
MHz
hFE
30
β
Ic
0.1
A
Pc
0.36
W
Pol
PNP
Tj
175
°C
TranMat
Si
Vcb
20
V
Vce
20
V
Veb
4
V
AC108
more info
Cc
50
pF
ft
0.5
MHz
hFE
30
β
Ic
0.05
A
Pc
0.03
W
Pol
PNP
Tj
80
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
Veb
10
V
AC120
more info
Cc
85
pF
ft
0.8
MHz
hFE
30
β
Ic
0.3
A
Pc
0.21
W
Pol
PNP
Tj
80
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
Veb
10
V
AC121
more info
Cc
40
pF
ft
1
MHz
hFE
30
β
Ic
0.3
A
Pc
0.9
W
Pol
PNP
Tj
90
°C
TranMat
Ge
Vcb
20
V
Vce
20
V
Veb
10
V