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.
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.
$1.05
Transformer - Lehle, Audio, Line-Bridging, Unbalanced to Balanced
The LEHLE TRANSFORMER MZ is the ideal component to avoid hum loops without degrading the sound. It achieves this through galvanic isolation of low to mid impedance audio signal sources. It can be used as an input or output transformer, for balanced or unbalanced signals.
$47.95
PCB - SMD to Thru-Hole Adapter, SSI2140 to SSM2040
PCB for converting SMD SSOP-20 SSI2140 chips to through hole DIP-18 SSM2040 chips. This adapter makes the SSI2140 pin for pin compatible with the original IC. Solder the device to this PCB then attach pin headers (sold seperately) to connect to through hole footprints on PCBs, breadboards and IC sockets.
$0.95
Switch - Carling, Mini Toggle, SPDT, 3 Position, Solder Lugs, Short Bat
Carling, SPDT mini toggle with short actuator, 3 positions, ¼" mounting hole diameter, 0.354" bushing length.
  • 0.354" bushing length
  • 3-Position On/Off/On
  • ¼" mounting hole diameter
  • Single pole/Double throw (SPDT)
  • Solder lugs
$4.50
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
Op-Amp - NJM4558, Dual high-gain, 8-Pin DIP
Dual Operational Amplifier. The NJM4558 (JRC4558) integrated circuit is a dual high-gain operational amplifier internally compensated and constructed on a single silicon chip using an advanced epitaxial process. Combining the features of the NJM741 with the close parameter matching and tracking of a dual device on a monolithic chip results in unique performance characteristics. Excellent channel separation allows the use of the dual device in single NJM741 operational amplifier applications providing density. It is especially well suited for applications in differential-in, differential-out as well as in potentiometric amplifiers and where gain and phase matched channels are mandatory. Features:
  • Operating Voltage (±4V~±18V)
  • High Voltage Gain (100dB typ.)
  • High Input Resistance (5MΩ typ.)
  • Bipolar Technology
$0.90
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
LED - 5mm, Water Clear, High Brightness, Package of 5
Package of 5
Colors Available:
High brightness 5mm LED. Great for use in pedal and amp builds as well as other applications where a bold, bright, indicator is needed. Multiple colors available.
  • 5mm size
  • Water clear
  • High brightness
  • Multiple colors available
  • Package of 5
Starting at $1.30
Potentiometer - Alpha, Audio, 9mm, Vertical, D-Shaft
Audio taper (log), 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.
$1.75
Integrated Circuit - SSI2164, Quad VCA, Sound Semiconductor
The FatKeys™ SSI2164 is perhaps the most flexible VCA available, with four independent channels for lowest cost-per-VCA. The user-selectable mode control allows Class A, AB, or intermediate biasing, and current inputs and outputs provide great design freedom. Ideal for voltage-controlled filters. The SSI2164 is a versatile VCA building block for high-performance audio applications. Four independent channels provide voltage control of current-mode inputs and outputs for a gain range from +20dB to –100dB, with control provided by a ground-referenced –33mV/dB constant. The SSI2164 will directly retrofit existing SSM/V2164 positions while offering improvements that include significantly lower overall distortion, on-chip protection against asymmetrical power failure, and a substantial increase of input current handling. The device offers considerable flexibility for a wide range of design goals and applications.
$6.95
Power Jack - Lumberg, DC Panel Mount, 5.5mm External, 2.1mm Internal
Lumberg panel mount barrel jack with solder lugs.This DC jack features a normally closed switch on the ring (sleeve) connection. For use with barrel plugs with a 5.5mm external diameter and 2.1mm internal diameter. Mounting nut included.
$1.15
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
Transistor - JFET N-Ch Transistor Lo Freq / Lo Noise, PF5102
PF5102 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 = 40 V
  • Max gate to source voltage = -40 V
  • Max forward gate current = 50 m
$1.85
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
Power Jack - Lumberg, DC Panel Mount, Snap-in, 5.5mm External, 2.1mm Internal
Snap-in Lumberg panel mount barrel jack with solder lugs. This high quality jack is a similar size to the Lumberg low profile jack but easily snaps into place with no need to thread a nut inside the chassis. For use with barrel plugs with a 5.5mm external diameter and 2.1mm internal diameter.
$1.55
Switch - Carling, Mini Toggle, SPDT, 2 Position, Solder Lugs
Carling, SPDT mini toggle, 2 positions, ¼" mounting hole diameter, 0.354" bushing length.
$3.35
Knob - Rogan, PT Series, 1P, Small, Pointer, D-Shaft
High-quality USA made knobs from Rogan Corp. These small 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 D-shafts.
  • Height: 0.55 in.
  • Diameter: 0.45 in.
  • Fits 6mm D Shafts
  • Indicator on round side of D-shaft

For a T18 knurled version of this knob, see P-K271P-W. A variety of different sizes are available from the PT Series.
$1.65
BreadBoard - Solderless, 400 point pattern
Solderless (plug-in) breadboard with 400 connection tie-points (i.e. 400 wire insertion holes) and 4 power rails. Solderless breadboards are great for building and testing new circuits because parts can be easily inserted and removed making them completely re-usable. This breadboard has a 300 tie-point IC-circuit area plus four 25 tie-point power rails. The housing is made of white ABS plastic, with a printed legend giving numbers and letters for columns and rows. The internal contacts are phosphor bronze with a plated nickel finish and a peelable adhesive tape backing is provided for attaching it to a surface. Be sure to check out the Zipwire™ jumper wire kits for use with this breadboard.
$5.50
Potentiometer - Alpha, Audio, Solid Shaft, Long PC, 16mm
Audio taper Alpha 16mm pots with a solid shaft and long PCB mount 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”)
  • Lead Depth from Panel: 20.7 mm + 4 mm (0.815” + 0.158”)
  • Lead Distance from shaft center: 14.3 mm (0.563”)
  • Lead Thickness: 0.5 mm (0.020”)
  • Shaft Diameter: 6.35 mm (0.25”)
$0.79
Switch - Carling, Submini Toggle, DPDT, 2 Position, PC Pins
Carling submini toggle switch, DPDT, 2 position, .195" mounting hole diameter, 0.236" bushing length.
$4.15
Transistor - 2N797, Germanium, TO-18 case, NPN
2N797 NPN germanium transistors. The 2N797 is a popular NPN for fuzz pedals and other effects. The NPN polarity allows for use with standard pedal power supplies. The 2N797 is a fairly unique germanium transistor since it is in a TO-18 package.
$2.95
Diode - 1N914, Small Signal
The 1N914 is a small signal diode similar to the 1N4148 and is common in many older electronics. The 1N914 is general purpose and can be used in a multitude of different applications.
$0.18
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
$7.95
Heat Shrink - ¼" Diameter x 6" Long, 23 Pieces
Package of 23
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.
$9.95