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.
Integrated Circuit - SSI2161, Single VCA, Sound Semiconductor
A very high performance single-channel VCA for the most demanding applications, the ProCircuit™ SSI2161 offers industry-leading lowest-noise, and a mode control to optimize noise vs. distortion performance. All at low-cost and in a 10-lead SSOP package. The SSI2161 is a versatile VCA building block for high-performance audio applications. A single channel provides 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 device offers considerable flexibility for a wide range of design goals and applications. A unique mode control allows selection of Class A, Class AB, or in-between using a single resistor. In addition, improved current handling allows use of lower value input resistors for reduced output noise without loss of headroom.
$5.45
Potentiometer - Alpha, Audio, 9mm, Vertical, Dual Gang, 100K
Audio taper, vertical mount, dual gang Alpha pots with a 6.35mm shaft diameter. Dual gang pots are useful for stereo controls and other circuits requiring two separate pots moving in tandem. These 9mm pots are popular in DIY guitar pedals, synthesizers, and other projects. Mounting nut and washer included. See R-VAV-BX-DUAL for linear taper versions.
$2.55
Capacitor - 50V, 680pF, Ceramic Disc
Ceramic disc capacitor, 680 pF (.00068µF) rated for up to 50 V.
Non linear temperature coefficient of capacitance
$0.55
Screws - M3-0.5 Socket Head Cap, 8mm Length
Package of 5
Colors Available:
Ideal for precision assembly work with close tolerances and applications needing a well tooled appearance.
Starting at $0.75
Capacitor - 50V, 0.047µF, Used In Pedal Kits
Polyester Film Capacitor used in MOD® Pedal Kits. Rated at 0.047µF 50V. Tolerance: 10%. Operating temperature: -40 C to +85 C
$1.00
Potentiometer - Alpha, Linear, Solid Shaft, PC Lead, 16mm
Alpha Mini Pots with solid shaft and short PC mount terminals.
  • Threading: M7 x 0.75
  • Distance between terminals: 5 mm (0.197”)
  • Lead Depth from Panel: 3.8 mm (0.150”)
  • Lead Distance from shaft center: 12.5 mm + 3.5 mm (0.492” + 0.138”)
  • Lead Thickness: 0.5 mm (0.020”)
$1.10
Switch - Carling, Mini Toggle, SPDT, 2 Position, Solder Lugs, Short Bat
Carling, SPDT mini toggle, 2 positions, ¼" mounting hole diameter, 0.354" bushing length.
$3.09
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
$0.28
Power Jack - DC Panel Mount, 5.5mm External, 2.1mm Internal
Colors Available:
½" panel mount with solder lugs. Round plastic with normally closed switch. For barrel plugs with a 5.5mm external diameter and 2.1mm internal diameter.
Starting at $0.75
Potentiometer - Alpha, Reverse Audio, 9mm, Right Angle, 25KΩ
Reverse audio taper (antilog), right angle, 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.
$1.85
Knob - Plastic, Set Screw, Skirted Pointer, 1.125" Diameter
Large black plastic control knob with set screw and brass insert. This distinctive pointer knob is similar to the selector knobs used on original MiniMoog and Moog modular synths. It features a triangular pointer, a radial brushed metal top, and a line indicator. The large skirt has a diameter of 1.125 inches. Fits ¼” (6.35mm) pot shafts.
$1.55
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
Switch - Carling, Mini Toggle, SPDT, 2 Position, Solder Lugs, Flattened
Carling mini-toggle switch, SPDT. This switch features a flattened actuator.
  • 0.354" bushing length
  • 2-Position On/On
  • ¼" mounting hole diameter
  • Single pole/Double throw (SPDT)
  • Solder Lugs
$4.35
Integrated Circuit - AS3320, Multi-Mode VCF, Alfa, 18-Pin Dip
The AS3320 is Alfa’s version of the CEM3320 IC. The AS3320 is a high performance voltage controlled four-pole filter with on-chip voltage controllable resonance IC. 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 greater than a ten octave range with little control voltage feedthrough. Another input controls the resonance in a modified linear manner from zero to low distortion oscillation. For those demanding applications, provision has been made to allow trimming for improved control voltage rejection. Each filter section features a variable gain cell which is fully temperature compensated, exhibits a better signal-to-noise ratio and generates its low distortion predominantly in the second harmonic. The device includes a minus two volt regulator to ensure low power dissipation and consequent low warm-up drift.
$5.95
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
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
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
Potentiometer Adapter Sleeve - Converts .125” shaft to ¼"
This nickel-plated brass adapter sleeve converts a 0.125 in. (3.17mm) shaft potentiometer to ¼" shaft (6.35mm), allowing for ¼" knobs to be used on a wider range of potentiometers. The cutout on the sleeve allows the set screw of the knob to secure directly to the shaft of the pot. Depending on the knob used, a longer set screw can be required.
$1.50
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
Diode - 1N270, Germanium, DO-7
1N60 point-contact germanium diodes in a DO-7 package. 1N60 diodes were used in many vintage electronics and also make for great clipping diodes in stompbox effects pedals. The MXR® Distortion+ uses the 1N270
$1.89
Switch - Carling, Mini Toggle, SPDT, 2 Position, Solder Lugs
Carling, SPDT mini toggle, 2 positions, ¼" mounting hole diameter, 0.354" bushing length.
$2.85
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
Switch - Carling, Submini Toggle, DPDT, 2 Position, PC Pins
Carling submini toggle switch, DPDT, 2 position, .195" mounting hole diameter, 0.236" bushing length.
$4.35
LED Lens - Fresnel, Polycarbonate, 5mm
Colors Available:
Panel mount led lenses made of high quality polycarbonate. These lenses provide a clean semi-flush appearance with a small panel footprint and work well in any project using LED indicators. Features:
  • ¼” mounting hole
  • For panel thicknesses of 1/16” to ⅛”
  • Fresnel lens
  • Low Profile
Starting at $0.59