Synth & Eurorack Parts / DIY

Our Synth & Eurorack Parts / DIY category is a curated list of items that are commonly found in synth/eurorack projects. The items and filters here do not represent our full lineup of parts. If you don't see what you are looking for, check out our main categories or send us a suggestion and we'll look into adding it.

Transistors

Transistor - 2N5135, Silicon, TO-105 case, NPN
The 2N5135 is a silicon NPN transistor in a TO-105 case. This transistor is a close match to the rare 2N5133 but with higher voltage ratings and is in a larger package. The hFE range is less wide than the 2N5133 with more values in the range found in the batches used on vintage Big Muff pedals. The lower hFE range also makes these a great option for silicon fuzz pedals.
$1.75
Transistor - BC183, General Purpose, TO-92 case, NPN, Gain Sorted
The BC183 is a general purpose NPN transistor in a TO-92 case. The BC183 is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz. The BC183 is available in three different gain ranges: BC183A, BC183B, and BC183C. Type hfe (IC=2mA, VCE=5V, f=1KHz) BC183A 125-260 BC183B 240-500 BC183C 450-900
Starting at $0.25
Transistor - BC337, General Purpose, TO-92 case, NPN
The BC337 is a silicon general purpose NPN transistor in a TO-92 package. The BC337’s typical applications include signal processing, amplification, and switching. The BC337 is available in three different gain ranges: BC337-16, BC337-25, and BC337-40. Type hFE Range (IC=100mA, VCE=1V) Typical hFE (IC=100mA, VCE=1V) BC337-16 100-250 160 BC337-25 160-400 250 BC337-40 250-630 400
$0.25
Transistor - BC108, TO-18 case, NPN
BC108 NPN silicon transistors. The BC108 is a popular NPN choice for fuzz pedals and other effects such as vintage silicon Fuzz Face builds and Big Muff clones. Type hFE (IC=2mA, VCE=5V) hfe (IC=2mA, VCE=5V, f=1KHz) BC108A 110-220 125-260 BC108B 200-450 240-500 BC108C 420-800 450-900
  • NPN polarity
  • Collector emitter breakdown voltage 25V
  • Collector base breakdown voltage 30V
  • Collector current 200mA
  • Power 0.75W
  • Transition frequency 150MHz
  • TO-18 case
  • Weight 0.35g
$0.95
Transistor - BD139, Medium Power, TO-126 case, NPN
The BD139 is a NPN medium power BJT transistor in a TO-126 package. The BD139's typical applications include audio amplifiers and drivers but is also popularly used in silicon fuzz pedals. The BD139 is available in two different gain ranges: BD139-10 and QBD139-16. Type hFE (IC=150mA, VCE=2V) BD139-10 63-160 BD139-16 100-250
Starting at $0.49
Transistor - BC550, TO-92 case, NPN
Low noise transistor for audio frequency amplifier applications.
$0.27
Transistor - 2N270, Germanium, TO-5 case, PNP
2N270 PNP germanium transistors. The 2N270 is a popular PNP for fuzz pedals and other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors. The 2N270 has been used in effects such as the Maestro FZ-1 fuzz pedal.
$3.95
Transistor - 2N3392, Silicon, TO-92 case, NPN
The 2N3392 is a general purpose NPN transistor in a TO-92 case. The 2N3392 is used in some original silicon Fuzz Face pedals as well as the Brassmaster fuzz.
$0.39
Transistor - 2N3704, Silicon, TO-92 case, NPN
The 2N3704 is a general purpose silicon NPN transistor in a TO-92 case. The 2N3704 is primarily intended for general purpose amplification and switching applications.
$0.39
Transistor - 2N4125, Silicon, TO-92 case, PNP
The 2N4125 is a general purpose silicon NPN transistor in a TO-92 case. The 2N4125 is primarily intended for general purpose amplification. It is a popular choice for silicon fuzz pedals due to its low hFE specifications. It has also been used in a variety of classic pedals such as the Phase 90.
$0.25
Transistor - 2N527, Germanium, TO-5 case, PNP
2N527 PNP germanium transistors. The 2N527is a popular PNP for fuzz pedals and other effects. It can be found in modern classics such as the Sunface and Benson Fuzz. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.
$3.25
Transistor - 2N5485, JFET, N-Channel,TO-92
2N5485 N-channel JFET in a TO-92 package. The 2N5485 is an N−channel junction field effect transistors designed for RF amplifier and mixer applications. These devices operate well in the VHF/UHF frequency range.
$1.25
Transistor - MPSA14, Darlington, 500mA, 30V, NPN
MPSA14 NPN Darlington transistor (TO-92 package) - designed for high gain, low noise general purpose amplifier applications.
  • Max collector to emitter voltage = 30 V
  • Max collector to base voltage = 30 V
  • Max emitter to base voltage = 10 V
  • Max collector current = 0.5 A (continuous)
$0.25
Transistor - MPSA64, Darlington, -500mA, -30V, PNP
MPSA63 PNP Darlington transistor (TO-92 package) - designed for high gain, low noise general purpose amplifier applications.
  • Max collector to emitter voltage = -30V
  • Max collector to base voltage = -30 V
  • Max emitter to base voltage = -10 V
  • Max collector current = -0.5 A (continuous)
$0.25
Transistor - 2N2369, Silicon, TO-18 case, NPN
The 2N2369 is a silicon NPN transistor in a TO-18 metal case type. The 2N2369 is primarily intended for use in high speed switching and VHF amplification applications.
$0.85
Transistor - 2N321, Germanium, TO-5 case, PNP
2N321 PNP germanium transistors. The 2N321 is a popular PNP for fuzz pedals and other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.
$4.95
Transistor - 2N3566, Silicon, TO-105 case, NPN
The 2N3566 is a silicon NPN transistor in a TO-105 case. The 2N3566 is primarily intended for general purpose amplifier applications. The 2N3566 was used in the Astrotone fuzz and Sam Ash Fuzzz Boxx.
$1.95
Transistor - 2N4123, Silicon, TO-92 case, NPN
The 2N4123 is a general purpose silicon NPN transistor in a TO-92 case. The 2N4123 is primarily intended for general purpose amplification. It is a popular choice for silicon fuzz pedals due to its low hFE specifications.
$0.45
Transistor - 2N508, Germanium, TO-5 case, PNP
2N508 PNP germanium transistors. The 2N508 is a popular PNP for fuzz pedals and other effects. It can be found in modern classics such as the Sunface. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.
$3.50
Transistor - 2N5459, JFET, N-Channel,TO-92
2N5459 N-channel JFET in a TO-92 package. The 2N5459 is an N−channel junction field effect transistors, depletion mode (Type A), designed for audio and switching applications. Features
  • N−Channel for Higher Gain
  • Drain and Source Interchangeable
  • High AC Input Impedance
  • High DC Input Resistance
  • Low Transfer and Input Capacitance
  • Low Cross−Modulation and Intermodulation Distortion
$1.25
Transistor - 2N708, Silicon, TO-18 case, NPN
The 2N708 is a silicon NPN transistor in a TO-18 metal case type. The 2N708 is primarily intended for use in high speed switching and VHF amplification applications.
$0.75
Transistor - MPSA63, Darlington, -500mA, -30V, PNP
MPSA63 PNP Darlington transistor (TO-92 package) - designed for high gain, low noise general purpose amplifier applications.
  • Max collector to emitter voltage = -30V
  • Max collector to base voltage = -30 V
  • Max emitter to base voltage = -10 V
  • Max collector current = -0.5 A (continuous)
$0.45
Transistor - 2N1308, Germanium, TO-5 case, NPN
2N1308 NPN germanium transistors. The 2N1308 is a popular NPN for fuzz pedals and other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.
$4.89
Transistor - SE4010, Silicon, TO-106 case, NPN
The SE4010 is a silicon NPN transistor in a TO-106 case. The SE4010 is primarily intended for general purpose audio applications. The SE4010 is a favorite for transistor Big Muff builds.
$1.75