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.
P-Q972 Diode - 1N34A Germanium, low leakage
The 1N34A Germanium diode is an old standby in electronics. Widely used for detecting the rectifying efficiency or for switching on a radio, TV or stereo etc.
S-HS-KN-M3 Screws - Befaco, Knurlies, Eurorack, M3
Befaco Knurlies are unique screws designed specifically for Eurorack. These M3 screws can be secured by hand, all common screwdrivers and Allen keys. These are great for saving time when rearranging your synth. Each Knurlie comes with a fitted plastic washer to prevent rack rash. Sold individually.
R-VC-NUT Nut - CTS, 3/8-32, Nickel, for 450 Series Potentiometers
Replacement nut for CTS 450 series potentiometers and others.
  • 3/8-32 threading
  • Sold individually
R-VAM100KAX2-SS Potentiometer - Alpha, Audio, Solid Shaft, 16mm, Dual, 100kΩ
100kΩ dual-gang 16mm potentiometers with a solid shaft and an audio taper. These pots have solder lug terminals. The smaller size is useful for builds with limited panel space such as guitar pedals, synthesizer modules, and adding modifications to equipment. Washer and nut included.
  • Threading: M7 x 0.75
  • Distance between terminals: 5 mm (0.197”)
  • Bushing Length: 6.5mm (0.256")
  • Shaft Diameter: 6.35mm ( 0.250")
  • Taper: Audio (Log)
P-PANEL-EU-X Panel - Eurorack Blanks, Reversible Black / Aluminum, 1.6mm
Aluminum blank panels for use with eurorack synths. These 1.6mm thick panels feature a painted black side and a bare aluminum side. Simply flip the panel around to match your color scheme. Elongated holes are used for the mounting holes to ensure a proper fit in your rack. These low cost panels are great for filling gaps in your system or making DIY modules. Blank panels are also referred to as blind panels. Standard Eurorack panels have the same height of 128.5mm but the width varies and is measured in HP. HP is short for horizontal pitch. A single HP is 0.2” (5.08mm). The 2HP panel will measure 0.4” wide (10.16mm”) and the 20HP panel will measure 4.0” wide (101.6mm).
Starting at $2.40
R-GHKIT Resistor Kit - ⅛ Watt, Metal Film, 1% tolerance, 5 of each value
Package of 230
Metal Film resistors consist of a resistive element of an extremely thin layer of metal alloy vacuum deposited on a substrate. Precise and quiet.
P-HTOG-GORVA-M2 Switch - GØRVA, Mini Toggle, DPDT, 2 Position, Solder Lugs, Medium Bat
Premium two position DPDT mini toggle switches from Gorva Design. The Bascular Mini switches have a medium 7.5mm actuator length. These switches feature silver plated copper contacts. RoHS compliant & lead-free. Mounting hardware included. Details
  • 8.89 mm bushing length
  • Medium bat
  • 2-Position On/On
  • ¼" mounting hole diameter
  • Double pole/Double throw (DPDT)
  • Solder lugs

  • Power Rating: DC9V, 1A
  • Contact Resistance: <10mΩ
  • Insulation Resistance: 1000MΩ Minimum
  • Dielectric Strength: 1000V RMS @ Sea Level
  • Operating Temperature: -40°C ~ +85°C
  • Electrical Life: 40,000 Cycles
  • RoHS & Lead-free
P-QOPA134 Op-Amp - OPA134, Single, High Performance Audio, 8-Pin DIP
OPA134 single op amp in an 8-pin DIP package. The OPA134 series are ultra-low distortion, low-noise operational amplifiers fully specified for audio applications. A true FET input stage is incorporated to provide superior sound quality and speed for exceptional audio performance. This, in combination with high output drive capability and excellent DC performance, allows for use in a wide variety of demanding applications. In addition, the OPA134 has a wide output swing, to within 1 V of the rails, allowing increased headroom and making it ideal for use in any audio circuit. The OPA134 SoundPlus™ audio operational amplifiers are easy to use and free from phase-inversion and the overload problems often found in common FET-input operational amplifiers. They can be operated from ±2.5-V to ±18-V power supplies.
S-M15 Heat Shrink - flame retardant polyolefin, 7.6mm unheated, black
Sold by the yard
Very flexible, high flame retardant polyolefin heat shrink tubing. Unheated outer diameter of about 7.6 mm with a 2:1 shrink ratio. Resistant to common liquid solvents with excellent physical, chemical, and electrical performance.
P-H54-DRESS-WIDE Nut - Wide Dress Nut, Threaded Through, For Mini Toggle Switches
Threaded through wide dress nuts for use with mini toggle switches. This wide based nut is not capped allowing the nut to thread past the top of the switch’s bushing. The uncapped top can be useful where internal depth is an issue such as parallel PCB mounting. These plated dress nuts feature a wide chamfered edge for a professional and unique look. These work on any 1/4-40 UNS threaded bushing. Two sides are flatted for use with a tool when fastening.
P-K310X Knob - Aluminum, Notched Tip Indicator, Set Screw, .75" Diameter
Colors Available:
¾" dia. Knurled aluminum knob, 'positive grip', notched tip indicator, fits ¼" shaft. With set screw. Multiple color options available.
P-K272PS-W Knob - Rogan, PT Series, 2PS, Medium, Skirted, Pointer, Knurled Shaft
High-quality USA made knobs from Rogan Corp. These medium, skirted pointer knobs from Rogan’s PT Series feature a soft rubber grip molded over a solid polymer knob. PT Series knobs can be found on synthesizer modules from Make Noise, Mutable Instruments and others. Fits 6mm T18 knurled shafts.
  • Height: 0.84 in.
  • Diameter: 0.62 in.
  • Fits T18 Knurled Shafts

For a D-shaft version of this knob, see P-K282PS-W. A variety of different sizes are available from the PT Series. See the links below for the full selection of knurled shaft knobs from this series. P-K271P-W 1P Small Pointer P-K271PS-W 1PS Small Skirted Pointer P-K272P-W 2P Medium Pointer
P-PC-ST1 StripBoard - Single Sided, 3.15” x 1.97”, Mounting Holes
Prototyping circuit board with a standard long strip pattern where tracks run the length of the board. The long tracks are convenient for power and ground rails, and for signal buses. Strips can be cut as needed to make smaller tracks and circuit pads and the board has 0.1" hole spacing for DIP integrated circuits/ headers as well as other parts. Higher quality than traditional stripboard, the holes are drilled, not punched.
P-QMPSA64 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)
P-R-ABE DSP Module - ABE, Accu-Bell Effector, 3 Adjustable Effects
The Accu-Bell Effector offers reverb, chorus, and delay with adjustable setting and tap tempo. This module runs on 5.5V to 9.5V DC so it is easy to incorporate into effect pedal builds. Please see the attached datasheet for an example schematic.
P-Q1N4742A Diode - 1N4742A, 12V, Zener, 1W, 5% Tolerance
1N4742A 12V zener diode in a DO-41 package. A semiconductor device that, above a certain reverse voltage(the zener value) has a sudden rise in current. If forward biased, the diode is an ordinary rectifier. When reverse biased, it exhibits a sharp break in its current-voltage graph. Voltage across the diode remains essentially constant for any further increase of reverse current.
P-Q4580D Op-Amp - NJM4580D, Dual, Audio, DIP 8
The NJM4580D is a dual opamp popularly used in many distortion pedals.
This chip is a dual operational amplifier, specially designed for improving the tone control, which is most suitable for the audio application. Featuring noiseless, higher gain bandwidth, high output current and low distortion ratio, it is most suitable not only for acoustic electronic parts of audio pre-amp and active filter, but also for the industrial measurement tools. It is also suitable for the headphone amp at higher output current, and furthermore, it can be applied for the handy type set operational amplifier of general purpose in application of low voltage single supply type which is properly biased of the low voltage source.
  • Operating Voltage ±2V~±18V
  • Low Input Noise Voltage 0.8µVrms typ.
P-QJ201-SLX Transistor - J201, Siliconix, JFET, N-Channel, TO-92
J201 N-Channel JFET in a TO-92 package made by Siliconix. 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
P-Q2N4061 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.
S-W428X Wire - Bus, 100 foot Spool, tinned copper
Solid tinned copper bus wire. 105°C temperature rating, 600V.
Starting at $7.95
P-QBC338-X 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
P-QLM741 Op-Amp - LM741, Single, general purpose, 8-Pin DIP
LM741 single opamp in an 8-pin DIP package. The LM741 has been used in classic guitar pedals such as the Distortion Plus.
The LM741 series are general purpose operational amplifiers which feature improved performance over industry standards like the LM709. They are direct, plug-in replacements for the 709C, LM201, MC1439 and 748 in most applications. The amplifiers offer many features which make their application nearly foolproof: overload protection on the input and output, no latch-up when the common mode range is exceeded, as well as freedom from oscillations.
P-QLT1054 Regulator - LT1054, Voltage Converter w/ Regulator, 8-Pin DIP
LT1054 switched-capacitor voltage converter with regulator in an 8 pin DIP package. The LT1054 device is a bipolar, switched-capacitor voltage converter with regulator. It provides higher output current and significantly lower voltage losses than previously available converters. An adaptive-switch drive scheme optimizes efficiency over a wide range of output currents. Total voltage drop at 100-mA output current typically is 1.1 V. This applies to the full supply-voltage range of 3.5 V to 15 V. Quiescent current typically is 2.5 mA. The LT1054 also provides regulation, a feature previously not available in switched-capacitor voltage converters. By adding an external resistive divider, a regulated output can be obtained. This output is regulated against changes in both input voltage and output current. The LT1054 can also shut down by grounding the feedback terminal.
On Backorder
R-VSHL-BX-CN Potentiometer - Song Huei, Center Notched, Linear, 9mm, Tall
Linear taper, vertical mount, Song Huei pots with a 6mm shaft and a notched center position sometimes called a center detent. These 9mm pots are popular in DIY guitar pedals, modular synthesizers, and other projects where space is limited. The knurled shaft features a painted indicator line so no knob is required. These tall versions have a 17mm shaft length and a total height of 25mm. For audio taper versions, see R-VSHL-AX. For standard linear taper versions, see R-VSHL-BX.
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