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 - 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
Integrated Circuit - SSI2130, VCO, Sound Semiconductor
The FatKeys™ SSI2130 Voltage Controlled Oscillator provides beautiful triangle, sawtooth, pulse, and square waveforms with unprecedented temperature stability; and adds an on-chip mixer, low distortion sine wave generator, through-zero FM/PM capability and more in an ultra-compact PCB footprint.
$8.95
Integrated Circuit - SSI2144, Ladder VCF, Sound Semiconductor
The second of two legendary SSM filter updates, the FatKeys™ SSI2144 is a dedicated four-pole low-pass ladder filter with on-chip resonance control. Original designer Dave Rossum did a number of performance updates such as lower noise, improved control feedthrough, and logical pin grouping but otherwise left this sweet-sounding VCF alone. The SSI2144 reprises the SSM2044 of legacy chipmaker Solid State Micro Technology, which many believe to be the best-sounding analog synthesis filter IC ever produced. Based on Dave Rossum’s patented classic improved ladder topology, the SSI2144 allows rich tonal characteristics that showcase the very best attributes of subtractive synthesis. The SSI2144 uses the same internal circuit as the SSM2044 but incorporates improvements by the original designer and takes advantage of modern process technology.
$6.50
Integrated Circuit - SSI2162, Dual VCA, Sound Semiconductor
The FatKeys™ SSI2162 provides two independent VCA channels, and like its SSI2161 and SSI2164 siblings offers great flexibility in design of dynamics processors, automatic or remote level control, and voltage controlled filters. Highly compact 10-lead SSOP package. The SSI2162 is a versatile VCA building block for high-performance audio applications. Two independent channels provide voltage control of a current-mode input and output 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. Both channels can be parallel-connected for further noise improvement.
$5.45
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.
$0.65
Potentiometer - Alpha, Linear, 9mm, Vertical
Linear taper, vertical mount, Alpha pots with a 6.35mm shaft diameter. These 9mm pots are popular in DIY guitar pedals, synthesizers, and other projects. Mounting nut and washer included.
$1.85
Potentiometer - Alpha, Audio, 9mm, Vertical
Audio taper (log), vertical mount, Alpha pots with a 6.35mm shaft diameter. These 9mm pots are popular in DIY guitar pedals, synthesizers, and other projects. Mounting nut and washer included.
$1.85
¼" Jack - Switchcraft, Enclosed, Mono, Shunt Tip
The Switchcraft Type 112A enclosed ¼” jack is a high quality jack featuring a switched tip. This jack has three solder lugs. One for the tip, one for the sleeve, and one for the switch which connects to the tip when no plug is inserted. These jacks have been widely used across the industry and can also be found in many popular 5U synthesizers. Includes nut and washer
  • Type 112AX
  • 0.276" bushing length (standard)
  • Mates with standard ¼" plugs and is available with 0.25" inside diameter bushing.
  • Mono 2-Conductor
  • Includes nut and washer
  • Tip is shunt
$2.39
Panel - Eurorack Blanks, Reversible Black / Aluminum, 1.6mm
Aluminum blank panels for use with eurorack synths. These 1.6mm thick panels feature a painted black side and a bare aluminum side. Simply flip the panel around to match your color scheme. Elongated holes are used for the mounting holes to ensure a proper fit in your rack. These low cost panels are great for filling gaps in your system or making DIY modules. Blank panels are also referred to as blind panels. Standard Eurorack panels have the same height of 128.5mm but the width varies and is measured in HP. HP is short for horizontal pitch. A single HP is 0.2” (5.08mm). The 2HP panel will measure 0.4” wide (10.16mm”) and the 20HP panel will measure 4.0” wide (101.6mm).
Starting at $2.35
LED Bezel - with included 3mm Red LED
Bezel Assembly with 3mm Red LED. Required hole size: 0.25". Washer and hex nut included. LED Specifications: Color Red Lens Diam 3 mm Overall Height 5.4 mm Lens Type Diffused Luminous Intensity Min. 3.6 mCd @If (test) 10 mA Wavelngth (Peak) 568 nm V(FM) Max.(V) Forward Voltage 2.7 V @I(F) (test) 10 mA Min Operating Temp -30° Max Operating Temp 80°
$0.85
Screw - M3, Phillips, Pan Head, Machine
Package of 5
Phillips panhead machine screw, 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.
See S-HS-M3-6-X for colored 6mm M3 screws.
Starting at $0.75
Key Contacts - Korg, Rubber, for Keyboards
For N364 and X5, 5 are required. for N264, 2 are needed. May be cut. Sold individually. These are also used in the Kurzweil MK (MARK)-Series of electronic pianos.
$5.50
Switch - Carling, Mini Toggle, SPDT, On-On, PC Mount, right angle
Genuine Carling 2 Position Mini Toggle, On-On, Short Round Bat, Right Angle, PC Mount Features:
  • SPDT ( Single Pole/ Double Throw) On-On switch
  • 0.275" bushing length
  • 0.270” bat length
  • ¼" chassis hole diameter
  • Right angle, PC Mount terminals

Note: On-On switches may sometimes be referred to as On-None-On.
$2.50
Nut & Washer - Panel, for ⅜" Potentiometers and Jacks
Package of 100
Replacement nut and washer for pots and jacks that feature a ⅜" bushing with 3/8-32 threading. Sold in packs containing 100 nuts and 100 washers.
$25.00
Washer - CTS, Flat, for Potentiometers
Package of 10
Flat washer for 3/8" bushing. Perfect fit for CTS potentiometers. Package of 10.
$1.25
Nut - Hex, for mounting Qingpu 3.5mm jacks
Hex nut for W-QP-419GR and W-QP-518MA 3.5mm jacks.
See W-QP-NUT-K for the knurled, slotted version of this nut.
See W-QP-WASHER for compatible washer
$0.07
Potentiometer - Alpha, 300kΩ, Linear, Knurled Shaft, 16mm
Miniature Alpha pot for guitars. 300K linear taper.
$1.50
Op-Amp - TL082, Dual, Wide-Bandwidth, JFET Input, 8-Pin DIP
Dual wide-bandwidth TL082 opamps in an 8-pin DIP package. The TL082 offers a high input impedance and 4MHz bandwidth.
$0.21
Diode - Zener, 1W, 1N4741A, 1N4748A
A semiconductor device that, above a certain reverse voltage(the zener value) has a sudden rise in current. If forward biased, the diode is an ordinary rectifier. When reverse biased, it exhibits a sharp break in its current-voltage graph. Voltage across the diode remains essentially constant for any further increase of reverse current.
$0.20
Standoff - M3, Male-Female, Aluminum, 5.5mm Diameter
  • Finish/Plating: Clear Iridite
  • Material: Aluminum
  • OD: 5.5mm
  • Shape: Hex (Metric)
  • Style: M-F Standoff
  • Thread Depth(D): 8mm
  • Thread Length (TL): 8mm
  • Thread: M3
  • Type: Threaded Standoffs
Starting at $0.60
Microphone Condenser - Korg, EM197K
Korg condenser microphone EM197K, used on the Korg MicroKORG.
$28.00
On Backorder
DSP Module - Accutronics, 99 Effects (Reverb, Chorus, Delay, +)
The BTSE-99FX Effect board provides 99 different digital audio effects to be used in many audio applications that require sound enhancement. Equipped with a superb quality digital effects processing engine which adds that extra punch needed to make sounds truly stand out. Applications:
  • Guitar/ Keyboard/Bass amplifiers and combos
  • Audio mixing consoles / Powered mixing consoles
  • Stand -alone stereo effect units for studio and PA usage
  • Effects pedals
$32.00
Knob - Dunlop, MXR, small knurled, aluminum
Genuine Dunlop replacement small knurled knob for MXR pedals. Push -on style knob designed for use with coarse knurled shafts.
$2.35
Washer - Flat, for use on Qingpu Jacks
Flat washer for W-QP-419GR and W-QP-518MA 3.5mm jacks.
$0.07