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 - OC139, Germanium, SO-2 glass case, NPN
OC139 NPN germanium transistors. The OC139 is a popular NPN for fuzz pedals and boost effects. This transistor is in a glass SO-2 package with long leads commonly found on germanium transistors. The NPN polarity allows for use with standard pedal power supplies. The dot indicates the collector lead. The OC139 can be found in the EarthQuaker Devices Bows germanium preamp.
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Transistor - OC140, Germanium, SO-2 glass case, NPN
OC140 NPN germanium transistors. The OC140 is a popular NPN for fuzz pedals and boost effects. This transistor is in a glass SO-2 package with long leads commonly found on germanium transistors. The NPN polarity allows for use with standard pedal power supplies. The dot indicates the collector lead.
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Transistor - GT309E, Germanium, USSR Saucer Case, PNP
New old stock Soviet GT309E transistors manufactured in Ukraine. The GT309E is a germanium PNP transistor in a very low profile case. The case has a 0.29” diameter and is only 0.1” thick. These have very low leakage and work well in a variety of fuzz pedal builds.
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Transistor - MPSA18, Low Noise, 200mA 45V NPN
NPN low noise transistor (TO-92 package) - designed for high gain, low noise general purpose amplifier applications.
  • Max collector to emitter voltage = 45 V
  • Max collector to base voltage = 45 V
  • Max emitter to base voltage = 6.5 V
  • Max collector current = 0.2 A (continuous)
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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.
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Transistor - 2N1303, Germanium, TO-5 case, PNP
2N1303 PNP germanium transistors. The 2N1303 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.
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Transistor Set - tested and selected for Fuzz Face, 2N1309, PNP, Germanium
This is a set of two 2N1309 germanium transistors that have been hand-selected to work in the germanium Fuzz Face circuit. Also included are 4 metal film resistors to use in the circuit. In most cases, the values have been modified from the stock values slightly to ensure that the collector of Q2 biases to roughly -4.5V. A data sheet containing the schematic and the resistor values is included so that you can use your own resistor type if you would prefer. There is a range of bias voltages that can sound nice in a Fuzz Face, and voltages in original units varied. These transistors have been tested with bias voltage, sound, and noise level in mind. Note that due to a variety of factors such as battery/PSU voltage, temperature, and component tolerance, the voltage on the collector of Q2 may not measure at exactly -4.5V, but it should be close in a properly-built circuit.
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Transistor - 2N3906, TO-92 case, PNP
General purpose low-power PNP bipolar junction transistor, used frequently in hobbyist electronic projects. For the NPN 2N3904 see P-Q2N3904
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Transistor - J201, JFET, N-Channel, TO-92
J201 N-Channel JFET in a TO-92 package. The J201 is designed primarily for low level audio and general purpose applications with high impedance signal sources.
  • Max drain to gate voltage = 40 V
  • Max gate to source voltage = -40 V
  • Max forward gate current = 50 mA
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Transistor - BC184, General Purpose, TO-92 case, NPN
The BC184 is a general purpose NPN transistor in a TO-92 case. The BC184 is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz. BC184 was used in various Colorsound pedals - Jumbo Tone Bender, Supa Tone Bender, Power Boost, etc. It was also used in the Schaller Fuzz, and has been used in fuzz pedals from well-known builders such as Skreddy Pedals, D*A*M, and Stu Castledine.
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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.
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Transistor - 2N1307, Germanium, TO-5 case, PNP
2N1307 PNP germanium transistors. The 2N1307 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.
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Transistor - BC183L, General Purpose, TO-92 case, NPN
The BC183L is a general purpose NPN transistor in a TO-92 case. The BC183L is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz. The BC183L was used in some of the earliest silicon Fuzz Face pedals. The ECB pinout matches the arrangement on the P-PC-FUZZ-ISS2-BRN Iss. 2 PCB
  • NPN polarity
  • Collector emitter breakdown voltage 30V
  • Collector base breakdown voltage 45V
  • Collector current 100mA
  • Power 1W
  • Transition frequency 120MHz
  • TO-92 case
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Transistor Socket - Mill Max, 3 Pin, Machine Pin, Through Hole
High quality TO package transistor sockets by Mill-Max. These machine pin sockets make swapping transistors in pedals and other projects a simple process. These use a standard TO footprint so they are ready for use on PCBs with matching footprints.
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Transistor - AC132K, Germanium, Heatsink TO-1 case, PNP
AC132K PNP germanium transistors. The AC132K is a popular PNP for fuzz pedals and other effects. This transistor is in a thick rectangular heat-sink package with long leads commonly found on germanium transistors.
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Transistor - BC338, General Purpose, TO-92 case, NPN
The BC338 is a silicon general purpose NPN transistor in a TO-92 package. The BC338’s typical applications include signal processing, amplification, and switching. The BC338 is available in three different gain ranges: BC338-16, BC338-25, and BC338-40. Type hFE Range (IC=100mA, VCE=1V) Typical hFE (IC=100mA, VCE=1V) BC338-16 100-250 160 BC338-25 160-400 250 BC338-40 250-630 400
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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.
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Transistor - 2N404, Germanium, TO-5 case, PNP
2N404 PNP germanium transistors. The 2N404 is used in many fuzz pedals along with other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors. For a higher voltage version of this transistor, see P-Q2N404A.
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Transistor - J113, JFET, N-Channel,TO-92
J113 N-Channel Switch (TO-92 package) - designed for low level analog switching, sample and hold circuits and chopper stabilized amplifiers.
  • Max drain to gate voltage = 35 V
  • Max gate to source voltage = -35 V
  • Max forward gate current = 50 mA
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Transistor - BC238B, Silicon, TO-92 case, NPN
BC238B NPN transistor in a TO-92 package. The BC238 is used in a variety of vintage pedals such as the Schaller Fuzz, a version of the Brian May treble boost,and later Jen / Tonebender fuzz pedals. The BC238B is a variant of the BC108B and works well in other classic fuzz pedals such as Fuzz Face and Big Muff builds.
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Transistor - BC547, General Purpose, TO-92 case, NPN
The BC547 is a silicon general purpose NPN transistor in a TO-92 package. The BC547’s typical applications include signal processing, amplification, and switching. The BC547 is available in two different gain ranges: BC547B and BC547C. Type hFE (IC=2mA, VCE=5V) BC547B 200-450 BC547C 420-800
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Transistor - JFET, N-Channel, MMBFJ201, SOT-23
Surface mount MMBFJ201 JFET. Commonly used in place of the discontinued through-hole J201. These JFETs can be found in many effects pedals, synthesizers, and other projects. The MMBFJ201 is an N-Channel general purpose amplifier JFET. This device is designed primarily for low level audio and general purpose applications with high impedance signal sources.
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Transistor - 2N527, Germanium, TO-5 case, PNP
2N527 PNP germanium transistors. The 2N527 is 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.
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Transistor - 2N4061, TO-92 case, PNP
2N4061 PNP transistors. This is a silicon PNP transistor in a TO-92 package. The 2N4061 has been used in a variety of effects pedals and is most notably used in the Zonk Machine II.
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