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-L35X LED - 5mm diameter, diffused lens, 5 mCd
Package of 5
Colors Available:
5mm (T-1 ¾) diffused LED’s. Great for use in pedal builds and other applications where a tinted and diffused indicator is needed. Multiple colors available.
  • 5mm size
  • Tinted and diffused
  • Multiple colors available
  • Package of 5
$0.70
P-JB-IN-U-DUST 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.
$0.30
P-QM5201 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.
$4.50
S-TDUST 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.
$11.95
W-RN-920-X 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.
Starting at $0.99
R-VAV-AX-K Potentiometer - Alpha, Audio, 9mm, Vertical, Knurled Shaft
Audio 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.
$1.75
W-QP-PJ3410 3.5mm Jack - Qingpu, Eurorack, TRS, Switched, Panel or PC Mount
3.5mm TRS jacks with a switched tip found in many DIY Eurorack projects. These Qingpu Electronics jacks can be panel mounted with wires or more commonly PCB mounted. The PJ3410 jacks can be used for both mono and stereo signals. Hardware sold separately. See accessory items below.
$0.60
P-QJ113 Transistor - J113, JFET, N-Channel,TO-92
J113 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 = 35 V
  • Max gate to source voltage = -35 V
  • Max forward gate current = 50 mA
$0.49
P-QTL064 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
$0.59
P-RBTDR-2V-X 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.
$16.95
P-Q-AS194DE Transistor - AS194DE, Matched Pair, Alfa, SOIC-8, NPN
The AS194DE 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.
$4.50
P-K345X Knob - Plastic, Set Screw, MXR Style, 1.0" Diameter
Colors Available:
Large plastic knobs with set screw and brass insert. Similar to the knobs used on many classic Dunlop / MXR pedals. These knobs have a fluted grip with an indicator line as well as a dot indicator on the skirt. Fits ¼” (6.35mm) pot shafts.
$1.15
P-K281PS-W Knob - Rogan, PT Series, 1PS, Small, Skirted, Pointer, D-Shaft
High-quality USA made knobs from Rogan Corp. These small, 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 D-shafts.
  • Height: 0.71 in.
  • Diameter:0.57 in.
  • Fits 6mm D Shafts
  • Indicator on round side of D-shaft

For a T18 knurled version of this knob, see P-K271PS-W. A variety of different sizes are available from the PT Series.
$1.65
P-PC-PR1590BB ProtoBoard - Fits 1590BB, 1 sided, 2-hole strips
Prototyping circuit board (PCB) designed to fit the Hammond 1590BB die-cast aluminum enclosure. It has a convenient 2-hole pattern, which provides an easy way to connect parts while maximizing usable board area. It can be used as a stand-alone prototyping board, or installed in a Hammond 1590BB enclosure. For fastening your project to a surface see our adhesive standoffs (S-H190). Features:
  • Single-sided high-quality FR4 glass-epoxy circuit board.
  • Convenient 2-hole pattern provides an easy way to connect parts.
  • 1oz/ft2 copper with an anti-tarnish coating for easy soldering.
  • 0.042" holes are drilled on 0.1" (2.54mm) centers. 4 mounting holes.
  • PCB Size 3.20 x 4.25 in (81.3 x 108.0 mm)
$5.75
R-VAM5KC-SS-PCL2 Potentiometer - Alpha, Reverse Audio, Solid Shaft, Long PC, 16mm, 5kΩ
5kΩ reverse 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
P-H54-DRESS-X Nut - Dress Nut, For Mini Toggle Switches
Colors Available:
Dress nuts for use with mini toggle switches. These plated dress nuts feature a chamfered edge for a professional look and work on any 1/4-40 UNS threaded bushing. Two sides are flatted for use with a tool when fastening.
Starting at $0.57
P-STR-004 Transistor Socket - Mill Max, 3 Pin, Machine Pin, Through Hole
High quality TO package transistor sockets by Mill-Max. These machine pin sockets make swapping transistors in pedals and other projects a simple process. These use a standard TO footprint so they are ready for use on PCBs with matching footprints.
$1.95
P-Q-AS3372E Integrated Circuit - AS3372E, Synth Voice, Alfa, 24 Pin DIP
The AS3372E is Alfa’s take on the CEM3372 µP Controllable Signal Processor in a DIP-24 package. The AS3372E features an additional two VCA’s so an adapter board is required when using as a replacement for the CEM version. The CEM version was used in multiple classic synths, including the Oberheim Matrix 12, Oberheim Xpander, Sequential Prophet T8, Sequential Prophet 600, Akai AX80, Rhodes Chroma Polaris, and more.
$10.95
C-D-100V Capacitor - 100V, Ceramic Disc, ± 10%
100 V ceramic disc capacitors. ± 10% tolerance.
Starting at $0.20
P-QBC549X 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
Starting at $0.25
P-Q2N3904 Transistor - 2N3904, TO-92 case, NPN
General purpose low-power NPN bipolar junction transistor, used frequently in hobbyist electronic projects.
$0.18
P-K224 Knob - Davies, 1914, Daka-ware, Medium, Scalloped Edge
High-quality USA made knobs from Davies Molding. The 1914 knob is the larger version of the classic 1900H found on countless synthesizers and pedals. This knob is made of solid phenolic and features an indicator line on the top. The knob pairs perfectly with the smaller diameter 1900 knobs such as the P-K801-BRASS-X as well as the skirted P-K234X knobs.
  • Height: 0.50 in.
  • Diameter: 0.75 in.
  • Fits ¼" shaft with set screw
$3.55
S-HNFW-M3-X Washer - Flat, M3, Nylon, for Front Panels
Package of 10
Colors Available:
High quality nylon M3 flat washers. These durable washers fit perfectly on M3 threaded screws. The small outside diameter provides a clean look beneath the head of the screw. These are great mounting washers for preventing rack rash on front panels like Eurorack synths or any other use where the surface beneath the screw requires protection.
$0.95
P-Q2N3566 Transistor - 2N3566, Silicon, TO-105 case, NPN
The 2N3566 is a silicon NPN transistor in a TO-105 case. The 2N3566 is primarily intended for general purpose amplifier applications.
$1.95
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