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.
Transistor - OC141, Germanium, SO-2 glass case, NPN
OC141 NPN germanium transistors. The OC141 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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Diode - BAT41, Schottky, Small Signal
The BAT41 is a schottky diode used in many DIY projects. General purpose metal to silicon diode featuring very low turn-on voltage and fast switching. This device has integrated protection against excessive voltage such as electrostatic discharges.
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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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Integrated Circuit - AS3109D, VCF, Alfa, SOIC-16
The AS3109 is Alfa’s version of the Roland IR3109 VCF in an SOIC package. The AS3109 is a high performance voltage controlled four-pole filter. The four independent sections may be interconnected to provide a wide variety of filter responses, such as low pass, high pass, band pass and all pass. A single input exponentially controls the frequency over a range greater than 15 octaves with little control voltage feedthrough. AS3109 features high input impedance buffers. Features
  • Voltage controllable range – 15 octaves
  • Accurate exponential frequency scale
  • High input impedance buffers
  • Wide transconductance range
  • Low input offset voltage
  • Low control voltage feedthrough - 45 dB typical

Applications
  • For electronic music
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Wire - Bus, 100 foot Spool, tinned copper
Solid tinned copper bus wire. 105°C temperature rating, 600V.
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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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Switch - GØRVA, Submini Toggle, DPDT, 2 Position, PC Pins, Medium Bat
Premium two position DPDT submini toggle switches from Gorva Design. The Bascular Sub Mini switches have a medium 7.37mm actuator length. These switches feature silver plated copper alloy contacts. The bushing is smooth and the switch is secured with the mounting bracket on the PCB. RoHS compliant & lead-free. Details
  • 5.59mm non-threaded bushing
  • 2-Position On/On
  • 4.95mm panel hole diameter
  • Double pole/Double throw (DPDT)
  • PC Pins

Features
  • Power Rating: DC9V, 1A
  • Contact Resistance: <20mΩ
  • Insulation Resistance: 1000MΩ Minimum
  • Dielectric Strength: 1000V RMS @ Sea Level
  • Operating Temperature: -40°C ~ +85°C
  • Electrical Life: 30,000 Cycles
  • RoHS & Lead-free
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Op-Amp - TL064, Quad, Low Power, JFET-input, 14-Pin DIP
TL064 quad op amp in a 14-pin DIP package. The JFET-input operational amplifiers of the TL06x series are designed as low-power versions of the TL08x series amplifiers. They feature high input impedance, wide bandwidth, high slew rate, and low input offset and input bias currents. The TL06x series features the same terminal assignments as the TL07x and TL08x series. Features
  • Very Low Power Consumption
  • Typical Supply Current: 200 µA (Per Amplifier)
  • Wide Common-Mode and Differential Voltage Ranges
  • Low Input Bias and Offset Currents
  • Common-Mode Input Voltage Range Includes VCC+
  • Output Short-Circuit Protection
  • High Input Impedance: JFET-Input Stage
  • Internal Frequency Compensation
  • Latch-Up-Free Operation
  • High Slew Rate: 3.5 V/µs Typical
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Reverb Module - Accutronics, Digi-Log, vertical mount, mini
A great digital reverb sound that easily replaces a spring reverberation unit. Stereo outputs may be summed for mono operation. Simple interface requires only input, output, +5V, and ground.
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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.
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Switch - Carling, Mini Toggle, SPDT, 3-Position, PC Pins
Carling mini-toggle switch, single pole/double throw, PC Pins. ¼" mounting hole diameter. 0.354" bushing length. 3-Position, On-Off-On.
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PCB - Panel Mount Adapter, 9mm Right Angle Potentiometer
Small PCB adapter boards to convert PCB mount 9mm right angle pots to wired panel mount pots. These adapters are great for tight builds allowing for more densely populated panels than 16mm options. They’re also a great way to incorporate sealed potentiometers into builds where larger sized options would be cost prohibitive.
package of 5
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Switch - Carling, Mini Toggle, SPDT, 2 Position, PC Pins, Short Bat
Carling, SPDT mini toggle, 2 positions, ¼" mounting hole diameter, 0.354" bushing length.
  • 0.354" bushing length
  • 2-Position On/On
  • ¼" mounting hole diameter
  • Single pole/Double throw (SPDT)
  • PC mount pins
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CMOS - CD4077, Quad XNOR (Exclusive-NOR) Gates, 14-Pin DIP
The CD4077B contains four independent Exclusive-NOR gates. The CD4077B provides the system designer with a means for direct implementation of the Exclusive-NOR functions, respectively. Features:
  • High-Voltage Types (20V Rating)
  • CD4077B - Quad Exclusive-NOR Gate
  • Medium Speed Operation
  • tPHL, tPLH = 65ns (Typ) at VDD = 10V, CL = 50pF
  • 100% Tested for Quiescent Current at 20V
  • Standardized Symmetrical Output Characteristics
  • 5V, 10V and 15V Parametric Ratings
  • Maximum Input Current of 1µA at 18V Over Full Package Temperature Range
  • 100nA at 18V and 25°C
  • Noise Margin (Over Full Package Temperature Range)
  • 1V at VDD = 5V, 2V at VDD = 10V, 2.5V at VDD = 15V
  • Meets All Requirements of JEDEC Standard No.
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Dust Cap - For DC Power Jack, Low Profile Size
Dust cover for smaller low profile DC power jacks. This cover is simple to install and can help protect the power jack on effects pedals and other electronics using this style of DC jack. Jack sold separately.
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Op-Amp - M5201, Dual, With Switch, 8-Pin DIP
The NJM2120 is a dual operational amplifier of 2-INPUT and 1-OUTPUT with analog switch. The NJM2120 can be used as analog switch under the condition of GV=0dB, as Switch + Amp in order that each gain (A or B) can be adjusted independently. Each amplifier of the NJM2120 has the same electrical characteristics as the NJM4558. The NJM2120 is suitable for audio, video, electrical musical instrument, etc.
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Brush - Befaco, Gear Duster
Gear duster from Befaco. The Befaco Synth Duster is a great tool for getting dust off of faceplates and other hard to reach spots on your equipment. The super soft bristles can gently clean around pots, jacks, and other hardware.
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3.5mm Plug - Rean, cable mount, nickel-plated brass
High quality 3.5mm (1/8") plug. Features nickel plated brass contacts, with a nickel plated zinc shell. This plug uses a crimp strain relief for use with 4 mm O.D cables.
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Potentiometer - Alpha, Linear, 9mm, Vertical, Knurled Shaft
Linear taper, vertical mount, Alpha pots with a 6mm T18 knurled shaft. These 9mm pots are popular in DIY guitar pedals, synthesizers, and other projects. Mounting nut and washer included.
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Nut - Hex, for mounting Qingpu PJ3410 3.5mm jacks
Hex nut for W-QP-PJ3410 3.5mm jacks. See W-QP-NUT-PJ-R for the round, slotted version of this nut.
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Transistor - SFT319, Germanium, 18B4 case, PNP
SFT319 PNP germanium transistors. The SFT319 is a popular PNP for fuzz pedals and other effects. This transistor is in a 18B4 package with long leads commonly found on germanium transistors. This style of package can be found in Italian built Vox Tonebenders.
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Transistor - BC549, General Purpose, TO-92 case, NPN
The BC549 is a silicon general purpose NPN transistor in a TO-92 package. The BC549’s typical applications include signal processing, amplification, and switching. The BC549 is available in two different gain ranges: BC549B and BC549C. Type hFE (IC=2mA, VCE=5V) BC549B 200-450 BC549C 420-800
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Transistor - 2N3904, TO-92 case, NPN
General purpose low-power NPN bipolar junction transistor, used frequently in hobbyist electronic projects.
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Regulator - L78L33, 3.3 Volt, Positive Voltage Regulator, TO-92
L78L33 3.3V regulator in a TO-92 package. The L78L33 three-terminal 3.3V positive regulator employs internal current limiting and thermal shutdown, making them essentially indestructible. If adequate heat-sink is provided, they can deliver up to 100 mA output current. They are intended as fixed voltage regulators in a wide range of applications including local or oncard regulation for elimination of noise and distribution problems associated with single-point regulation. In addition, they can be used with power pass elements to make high-current voltage regulators. The L78L series used as Zener diode/resistor combination replacement, offers e improvement along with lower quiescent current and lower noise. Features:
  • Output voltage of 3.3V
  • Output current up to 100 mA
  • Short-circuit protection
  • No external components are required
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