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-QMC78L05 Regulator - MC78L05, 5 Volt, Linear Voltage Regulator
MC78L05 5V Linear Regulator. Used in MOD® kits. The TI version is the LM78L05. This fixed-voltage monolithic integrated circuit voltage regulator is suitable for applications that required supply current up to 100 mA.
W-SC-NUT38-K Nut - Switchcraft, Knurled Nut, 3/8”-32
Genuine Switchcraft ⅜” knurled nut commonly used on ¼” jacks. This nickel plated knurled nut has a ⅜”-32 threading and offers a clean look on builds using these nuts. The ⅜”-32 threading fits other hardware with matching threading such as CTS potentiometers.
R-VT96Y-X Trimmer - Bourns, 3296Y, Multiturn, Top Adjust, PCB Mount
High-quality Bourns 3296Y trimpots. These sealed cermet trimmers have 25 turns for precision setting. ±10% tolerance.
S-TND-2X Tool - Slotted Nut Driver, for Qingpu Jacks
Simple and easy to use nut driving tool for the slotted nuts found on Qingpu jacks that are commonly used in Eurorack modules. The tool anchors into the sleeve of the jack ensuring no slippage when in use, protecting the faceplate from accidental damage. The two grip holes are cut to the size of M2.5 and M3 hex nuts and can be used in a pinch to tighten nuts of those sizes, or to hang your tool on a keyring! One side of the tool works with Mod "Top Brass" nuts and slotted W-QP-NUT-K nuts used on W-QP-518MA, W-QP-419GR, and W-QP-518MA-BM. The other side works with slotted W-QP-NUT-PJ-R nuts used on W-QP-PJ3410. Either side will work with Befaco Bananuts for 3.5mm jacks (W-BNUT-X). The nut driving tool is made of steel.
W-QP-NUT-PJ-H Nut - Hex, for mounting Qingpu PJ3410 3.5mm jacks
Hex nut for W-QP-PJ3410 3.5mm jacks. See W-QP-NUT-PJ-R for the round, slotted version of this nut.
P-Q2N6027-A Transistor - 2N6027 Programmable Unijunction
2N6027 programmable unijunction transistor often referred to as a PUT. The 2n6027 can be found in many tremolo effects pedal projects.
On Backorder
P-QUA741 Op-Amp - µA741, Single, Offset Null, 8-Pin DIP
µA741 single op amp in an 8-pin DIP package. The µA741 device is a general-purpose operational amplifier featuring offset-voltage null capability. The high common-mode input voltage range and the absence of latch-up make the amplifier ideal for voltage-follower applications. The device is short-circuit protected and the internal frequency compensation ensures stability without external components. A low-value potentiometer may be connected between the offset null inputs to null out the offset voltage. Features
  • Short-Circuit Protection
  • Offset-Voltage Null Capability
  • Large Common-Mode and Differential Voltage Ranges
  • No Frequency Compensation Required
  • No Latch-Up
R-VAMA-SS Potentiometer - Alpha, Audio, Solid Shaft, 16mm
16mm solid shaft audio potentiometers. These pots are great for any project. 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)
Starting at $0.99
P-Q-AS3046D Transistor - AS3046D, Array of 5, Matched Pair, SOIC-14, NPN
The AS3046 is Alfa’s version of the CA3046 IC in an SOIC package. The AS3046D consists of five general purpose silicon NPN transistors on a common monolithic substrate. Two of the transistors are internally connected to form a differentially-connected pair. The transistors are well suited to a wide variety of applications in low power systems. They may be used as discrete transistors in conventional circuits however, in addition, they provide the very significant inherent integrated circuit advantages of close electrical and thermal matching. The AS3046D is available in a 14-pin SOIC package. Features
  • Matched pair of npn transistors
  • VBE matched less than ±1 mV
  • 5 general purpose monolithic transistors
  • Wide operating current range

  • Filters
  • Custom designed differential amplifiers
  • Temperature compensated amplifiers
P-K370X Knob - Black, White Line, Silver Top, Set Screw, Boss Style
Black knob with white line, silver top, set screw and brass insert. Fits ¼" shaft with set screw. These Boss style knobs come in a variety of sizes. See P-K383X for an unskirted version.
Starting at $1.50
P-K282PS-W Knob - Rogan, PT Series, 2PS, Medium, Skirted, Pointer, D-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 D-shafts.
  • Height: 0.84 in.
  • Diameter: 0.62 in.
  • Fits 6mm D Shafts
  • Indicator on round side of D-shaft

For a T18 knurled version of this knob, see P-K272PS-W. A variety of different sizes are available from the PT Series.
P-PC-PR1590B ProtoBoard - Fits 1590B, 1 sided, 2-hole strips
Prototyping circuit board (PCB) designed to fit the Hammond 1590B 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 1590B 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. Lead free and RoHS compatible.
  • 0.042" holes are drilled on 0.1" (2.54mm) centers. 2 mounting holes.
  • PCB Size 2.05 x 4.05 in (52.1 x 102.9 mm)
R-VAMA-K-PCL Potentiometer - Alpha, Audio, Knurled Shaft, Right Angle, 16mm
Audio taper 16mm potentiometers with a T18 knurled shaft. These pots have right angle 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: 10.7 mm + 5 mm (0.421” + 0.197”)
  • Lead Distance from shaft center: 16 mm (0.630”)
  • Lead Thickness: 0.5 mm (0.020”)
S-W22V-X Wire - 22 AWG Stranded Core, PVC, 600V, Variety Pack
Variety pack, 10 feet for each color. Great for color-coded wiring with smaller quantities. 600V stranded. Strands are tinned individually. See photos for detail. UL style 1015, rated to 105 degrees C. Perfect for new projects or rewiring any electrical equipment. 6 Pack (6 colors, 60 total feet) includes:
  • Black
  • Red
  • Green
  • White
  • Yellow
  • Blue

​​9 Pack (9 colors, 90 total feet) includes:
  • Black
  • Red
  • Green
  • White
  • Yellow
  • Blue
  • Orange
  • Brown
  • Purple

See S-W22 for 50 foot rolls of individual colors.
Starting at $11.50
P-QBC182 Transistor - BC182, General Purpose, TO-92 case, NPN
The BC182 is a general purpose NPN transistor in a TO-92 case. The BC182 is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz. The BC182 has a more narrow hFE range than the BC183 which can be helpful for certain builds.
P-Q1N5818 Diode - 1N5818, Schottky, High Switching Speed, 30V, 10A
1N5818 schottky diode with low forward voltage drop and high switching speeds.
  • Very small conduction losses
  • Negligible switching losses
  • Extremely fast switching
  • Low forward voltage drop
  • Avalanche capability specified
P-QNJM4558L Op-Amp - NJM4558L, Dual high-gain, 8-Pin SIP
NJM4558L dual op amp from JRC in a SIP8 package. The NJM4558L is the same as the DIP NJM4558 (JRC4558) otherwise. The SIP version is a great replacement for dual op amps in vintage circuits as well as a space saving package for some PCB layouts. The NJM4558L is a dual high-gain operational amplifier with internal compensation circuit and constructed on a single silicon chip. It offers excellent characteristics by combining the parameters adjusted for a monolithic chip. The channel separation characteristic is suitable for measuring instruments. Features:
  • Operating Voltage ( ±4V~±18V )
  • High Voltage Gain ( 100dB typ. )
  • High Input Resistance ( 5MΩ typ. )
  • Bipolar Technology

See P-Q4558 for the DIP version of this chip
P-QJ201 Transistor - JFET, N-Channel, MMBFJ201, SOT-23
Surface mount MMBFJ201 JFET. Commonly used in place of the discontinued through-hole J201. These JFETs can be found in many effects pedals, synthesizers, and other projects. The MMBFJ201 is an N-Channel general purpose amplifier JFET. This device is designed primarily for low level audio and general purpose applications with high impedance signal sources.
P-QBC560 Transistor - BC560, General Purpose, TO-92 case, PNP
The BC560 is a silicon general purpose PNP transistor in a TO-92 package. The BC560’s typical applications include signal processing, amplification, and switching.
P-Q2N5089 Transistor - 2N5089, TO-92 case, NPN
General purpose low level, low noise amplifier. Silicon NPN transistor.
P-XTAL-FV1 Crystal - 32.768 kHz, 12.5pF, 3x8mm
Through-hole mount crystal with a 32.768 kHz (32768 Hz) frequency. This crystal has a 12.5pF capacitance and is housed in a 3mm x 8mm package that is commonly used with Spin FV-1 chips. Features:
  • 32.768 kHz Frequency
  • 3x8mm Cylinder Case
  • Through Hole
  • 12.5pF
P-PC-SB400 Breadboard - Solderable PCB, 3.00” x 1.90”
The SB400 Solderable PCB BreadBoard enables you to transfer your circuit and wires from a plug-in breadboard without recutting wires or changing your layout. The SB400 has the same pattern and spacing as a standard 400 connection point BB400 solderless plug-in breadboard. It has a standard 5-hole strip for each IC pin, just like solderless breadboards plus 4 power rails. However, it has the advantage that soldered joints provide a more reliable long-term connection than solderless contacts. The SB400 has four power rails like solderless breadboards, plus two bonus rails for power or signals. There are bonus two-hole pads along the centerline allowing DIL (dual in-line) headers to be used. BPS prototyping boards use high-quality FR4 glass epoxy PCBs for long life, with an anti-tarnish protective coating for easy soldering.
P-Q2N4125 Transistor - 2N4125, Silicon, TO-92 case, PNP
The 2N4125 is a general purpose silicon NPN transistor in a TO-92 case. The 2N4125 is primarily intended for general purpose amplification. It is a popular choice for silicon fuzz pedals due to its low hFE specifications. It has also been used in a variety of classic pedals such as the Phase 90.
P-H548 Switch - Carling, Mini Toggle, SPDT, 2-Position, PC Pins
Carling mini-toggle switch, SPDT, PC Pins. 2-Position.
  • 0.354" bushing length
  • 2-Position On/On
  • ¼" mounting hole diameter
  • Single pole/Double throw (SPDT)
  • PC mount pins
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