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.
Heat Shrink - ¼" Diameter x 6" Long, 23 Pieces
The shrink ratio on this tubing is 2 to 1, it is fungus resistant and non-corrosive. It is recommended for tightly sealing connectors, terminals, wire splices, and tool handles. It may be shrunk with heat guns, oven, etc. Comes in 6 inch lengths, quantity of 23.
$8.95
package of 23
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
$0.30
Potentiometer - Alpha, Reverse Audio, 9mm, Vertical, 50KΩ
Reverse audio taper (antilog), vertical mount, Alpha pots with a 6.35mm shaft diameter. These 9mm pots are poplar in DIY guitar pedals, synthesizers, and other projects. Mounting nut and washer included.
$1.90
Dial Plate - 0 to 100, Black on Brushed Metal
Dial plates with 0-100 indicator marks. These plates are a simple way to add panel graphics to controls. They are easy to install beneath the nut of a potentiometer like a washer. The silk screened graphics on the brushed metal plate gives projects a clean and professional appearance. 40mm Dial Plate
  • 40 mm (1.575”) outer diameter
  • 9.95 mm (0.392”) inner diameter
  • Best for 25.4mm (1”) or smaller knobs

60mm Dial Plate
  • 60mm (2.362”) outer diameter
  • 9.95mm (0.392”) inner diameter
  • Best for 40.6 mm (1.59”) or smaller knobs
$1.70
Potentiometer - Song Huei, Linear, 9mm, Tall
Linear taper, vertical mount, Song Huei pots with a 6mm shaft. 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 center notched linear taper versions, see R-VSHL-BX-CN.
$0.95
CMOS - CD4016, Quad Bilateral Switch, 14-Pin DIP
CD4016B Series types are quad bilateral switches intended for the transmission or multiplexing of analog or digital signals. Each of the four independent bilateral switches has a single control signal input which simultaneously biases both the p and n device in a given switch on or off. Features:
  • 20-V digital or ± 10-V peak-to-peak switching
  • 280- typical on-state resistance for 15-V operation
  • Switch on-state resistance matched to within 10 typ. over 15-V signal-input range
  • High on/off output-voltage ratio: 65 dB typ. @ fis = 10 kHz, RL = 10 k
  • High degree of linearity: <0.5% distortion typ. @ fis = 1 kHz, Vis = 5 Vp-p, VDD–VSS
  • Extremely low off-state switch leakage resulting in very low offset current and high effective off-state resistance: 100pA typ.
$0.65
Transistor - 2N1308, Germanium, TO-39 case, NPN
2N1308 NPN germanium transistors. The 2N1308 is a popular NPN for fuzz pedals and other effects. This transistor is in a TO-39 package.
$4.89
Screw - M3, Nickel, Combination Head, Binding, 6mm
Combination Drive, Nickel, 6mm, M3 metric, zinc. Designed to go through a hole or nut that is pre-tapped to form a mating thread for the screw. Phillips drive is the most common drive used and is designed to "camout" when the screw reaches optimum tightness, thus preventing damage to the screw head.
$1.75
package of 5
PCB - SMD to Thru-Hole Adapter, QFN-32 to DIP-32
PCB for converting SMD QFN-32 packages to through hole DIP-32 footprints. Solder the device to this PCB then attach pin headers (sold seperately) to connect to through hole footprints on PCBs, breadboards and IC sockets.
$1.10
Transistor - 2N3904, TO-92 case, NPN, Lead Free
General purpose low-power NPN bipolar junction transistor, used frequently in hobbyist electronic projects. This version is lead free.
For a lead free 2N3906 see P-Q2N3906-LF.
$0.45
CMOS - CD4070, Quad XOR (Exclusive-OR) Gates, 14-Pin DIP
The CD4070B contains four independent Exclusive-OR gates. The CD4070B provides the system designer with a means for direct implementation of the Exclusive-OR functions, respectively. Features:
  • High-Voltage Types (20V Rating)
  • CD4070B - Quad Exclusive-OR 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.
$0.95
Transistor - AS394H, Matched Pair, Alfa, TO5-8 case, NPN
The AS394H is a junction isolated ultra well-matched monolithic NPN transistor pair with an order of magnitude improvement in matching over conventional transistor pairs. Electrical characteristics of these devices such as drift versus initial offset voltage, noise, and the exponential relationship of base-emitter voltage to collector current closely approach those of a theoretical transistor. Extrinsic base and emitter resistances are very low, giving very low noise and operating over a wide current range. To guarantee long term stability of matching parameters, internal clamp diodes have been added across the emitter-base junction of each transistor. These prevent degradation due to reverse biased emitter current, the most common cause of field failures in matched devices.
$4.25
On Backorder
Diode - 1N34A Germanium
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.
$1.95
Wrench - Befaco, Bananut Driver
Custom wrench tool for Bananuts. The two pegs slot into the notches on the Bananuts for an easy installation. Note: This wrench is only compatible with Befaco Bananuts
$6.50
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
$0.55
Potentiometer - Alpha, Linear, 9mm, Vertical, D-Shaft
Linear taper, vertical mount, Alpha pots with a 6mm D shaft. These 9mm pots are popular in DIY guitar pedals, synthesizers, and other projects. Mounting nut and washer included.
$1.90
Regulator - 7805, 5 Volt, 1A, Linear Voltage Regulator
5V linear regulator with up to 1 amp of current in a TO-220 package. This style of regulator can be found in many power supplies and also modular synth circuits as well as some stomp boxes. These voltage regulators are monolithic integrated circuits designed as fixed−voltage regulators for a wide variety of applications including local, on−card regulation. These regulators employ internal current limiting, thermal shutdown, and safe−area compensation. With adequate heatsinking they can deliver output currents in excess of 1.0 A. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents.
$1.45
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.
$0.95
Switch - GØRVA, Mini Toggle, DPDT, 3 Position, Solder Lugs, Medium Bat
Premium three 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
  • 3-Position On/On/On
  • ¼" mounting hole diameter
  • Double pole/Double throw (DPDT)
  • Solder lugs

Features:
  • 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
$1.95
Op-Amp - TL022, Dual, Low Power, 8-Pin DIP
TL022 dual op amp in an 8-pin DIP package. The TL022 is a dual low-power operational amplifier designed to replace higher power devices in many applications without sacrificing system performance. High input impedance, low supply currents, and low equivalent input noise voltage over a wide range of operating supply voltages result in an extremely versatile operational amplifier for use in a variety of analog applications including battery-operated circuits.
$0.69
Heat Shrink - flame retardant polyolefin, 7.6mm unheated, black
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.
$0.50
Sold by the yard
CMOS - CD4021, 8-Stage Static Shift Register, 16-Pin DIP
CD4021B series types are 8-stage parallel- or serial-input/serial output registers having common CLOCK and PARALLEL/SERIAL CONTROL inputs, a single SERIAL data input, and individual parallel "JAM" inputs to each register stage. Each register stage is D-type, master-slave flip-flop. In addition to an output from stage 8, "Q" outputs are also available from stages 6 and 7. In the CD4021B serial entry is synchronous with the clock by parallel entry is asynchronous. Entry is controlled by the PARALLEL/SERIAL CONTROL input. When the PARALLEL/SERIAL CONTROL input is low, data is serially shifted into the 8-stage register synchronously with the positive transition of the clock line. When the PARALLEL/SERIAL CONTROL input is high, data is jammed into the 8-stage register via the parallel input lines and synchronous with the positive transition of the clock line.
$0.95
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
$1.19
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.
$2.99