FA-1 FET Preamp

effect pedal project by BOSS

Here's the FA-1 FET Preamp effect pedal project from BOSS.

This project has been described using terms like booster, boss, overdrive, pre-amp, 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
    10u
  • C3
    10u
  • C4
    10u
  • C5
    10u
  • C6
    100u
  • C7
    10n
  • C8
    470n
  • C9
    5n6
  • C10
    33n
  • C11
    33n
  • C12
    5n6
  • P1
    50k Treble
  • P2
    50k Bass
  • P3
    1M Volume
  • Q1
    LM1458
  • R1
    10k
  • R2
    470k
  • R3
    1M
  • R4
    15k
  • R5
    15k
  • R6
    100k
  • R7
    10k
  • R8
    470k
  • R9
    3M3
  • R10
    6k8
  • R11
    33k
  • R12
    22k
  • R13
    8k2
  • R14
    470R
  • R15
    8k2
  • R16
    10k
  • S1
    SPST
  • T1
    2SK246
  • 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 9 alternatives for the 2SK246 mentioned above in the parts list for this project. These suggestions were derived by considering the original component's FETType, CntlChType, Vds, and Id 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. You can also to suit your preferences.

2SK246
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.3
W
Rds
6500
Ω
Tj
125
°C
Vds
50
V
2SK117
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.3
W
Rds
2500
Ω
Tj
125
°C
Vds
50
V
2SK184
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.2
W
Rds
2500
Ω
Tj
125
°C
Vds
50
V
2SK209
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.15
W
Rds
2500
Ω
Tj
125
°C
Vds
50
V
2SK330
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.2
W
Rds
3200
Ω
Tj
125
°C
Vds
50
V
2SK362
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.3
W
Rds
800
Ω
Tj
125
°C
Vds
50
V
2SK365
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.2
W
Rds
800
Ω
Tj
125
°C
Vds
50
V
2SK880BL
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.1
W
Rds
2500
Ω
Tj
125
°C
Vds
50
V
2SK2145
more info
CntlChType
N
channel
FETType
JFET
Id
0.014
A
Pd
0.3
W
Rds
2500
Ω
Tj
125
°C
Vds
50
V