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.
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.
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Finishing Nut - For ⅜” Jacks and Pots, ⅜”-32 UNEF-2A
Colors Available:
High quality plated ⅜” nuts for jacks and potentiometers. These nuts are perfect for amplifier, pedal and synthesizer builds with high aesthetics or color theming. The ⅜”-32 UNEF-2A threading fits many ⅜” bushing parts such as Switchcraft ¼” jacks and CTS pots.
package of 5
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Capacitor - 50V, 680pF, Ceramic Disc
Ceramic disc capacitor, 680 pF (.00068µF) rated for up to 50 V.
Non linear temperature coefficient of capacitance
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PCB - LED Driver, for Pedals and Synths
This small PCB is a simple way to add an indicator light that pulses to the rate of LFOs and clocks used in pedals, synthesizers, and other equipment. Simply connect the positive supply voltage to V+, ground to GND, and the output of a positive signal (0 to V+) such as an LFO or clock to the IN pad. The trimmer can adjust how the LED reacts to the signal. Fully clockwise it will simply pulse on and off when paired with a strong signal. If the signal is a sine, triangle, or any other non-pulse type signal, adjusting the trimmer counter clockwise can dial in settings that follow the shape of the waveform, brightening and dimming with the changing voltage. For certain dual op-amp LFOs in effect pedals, the signal may not go low enough to turn the LED fully off.
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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

For a version that fits 3mm LEDs, see P-L310-X.
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Transistor - BC183, General Purpose, TO-92 case, NPN
The BC183 is a general purpose NPN transistor in a TO-92 case. The BC183 is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz.
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Op-Amp - LF347, Quad, Wide Bandwidth, 14-Pin DIP
LF347 quad op amp in a 14-pin DIP package. The LF347 is a low cost, high speed quad JFET input operational amplifier with an internally trimmed input offset voltage ( BI-FET II™ technology). The device requires a low supply current and yet maintains a large gain bandwidth product and a fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The LF347 is pin compatible with the standard LM348. This feature allows designers to immediately upgrade the overall performance of existing LF348 and LM324 designs. The LF347 may be used in applications such as high speed integrators, fast D/A converters, sample-and-hold circuits and many other circuits requiring low input offset voltage, low input bias current, high input impedance, high slew rate and wide bandwidth.
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Screw - M3, Phillips, Pan Head, Machine
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.
package of 5
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3.5mm Jack - Qingpu, Eurorack, Stereo, PC Mount
PCB mounted 3.5mm stereo jacks commonly found in DIY Eurorack projects. These are the newest version from Qingpu Electronics featuring a square bushing plate for added durability. Hardware sold separately. See accessory items below.
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Op-Amp - NE5532, Dual, Low Noise, Audio, 8-Pin DIP
NE5532 dual op amp in an 8-pin DIP package. The NE5532 device is a high-performance operational amplifier combining excellent DC and AC characteristics. They feature very low noise, high output-drive capability, high unity-gain and maximum-output-swing bandwidths, low distortion, high slew rate, input-protection diodes, and output short-circuit protection. These operational amplifiers are compensated internally for unity-gain operation. These devices have specified maximum limits for equivalent input noise voltage. Features
  • Equivalent Input Noise Voltage: 5 nV/√Hz Typ at 1 kHz
  • Unity-Gain Bandwidth: 10 MHz Typ
  • Common-Mode Rejection Ratio: 100 dB Typ
  • High DC Voltage Gain: 100 V/mV Typ
  • Peak-to-Peak Output Voltage Swing 26 V Typ With VCC± = ±15 V and RL = 600 Ω
  • High Slew Rate: 9 V/μs Typ
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CMOS - CD4040, 12-Stage Ripple-Carry Binary Counter/Divider, 16-Pin DIP
The CD4040B is a 12-stage ripple-carry binary counter. All counter stages are master-slave flip-flops. The state of a counter advances one count on the negative transition of each input pulse; a high level on the RESET line resets the counter to its all zeros state. Schmitt trigger action on the input-pulse line permits unlimited rise and fall times.
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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.
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Op-Amp - TL084, Quad, Wide Bandwidth, JFET-input, 14-Pin DIP
TL084 quad op amp in a 14-pin DIP package. These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage ( BI-FET II™ technology). They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The TL082 is pin compatible with the standard LM1558 allowing designers to immediately upgrade the overall performance of existing LM1558 and most LM358 designs. These amplifiers may be used in applications such as high speed integrators, fast D/A converters, sample and hold circuits and many other circuits requiring low input offset voltage, low input bias current, high input impedance, high slew rate and wide bandwidth.
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Regulator - L78L33, 3.3 Volt, Positive Voltage Regulator, TO-92
L78L33 3.3V regulator in a TO-92 package. The L78L33 three-terminal 3.3V positive regulator employs internal current limiting and thermal shutdown, making them essentially indestructible. If adequate heat-sink is provided, they can deliver up to 100 mA output current. They are intended as fixed voltage regulators in a wide range of applications including local or oncard regulation for elimination of noise and distribution problems associated with single-point regulation. In addition, they can be used with power pass elements to make high-current voltage regulators. The L78L series used as Zener diode/resistor combination replacement, offers e improvement along with lower quiescent current and lower noise. Features:
  • Output voltage of 3.3V
  • Output current up to 100 mA
  • Short-circuit protection
  • No external components are required
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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
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CMOS - CD4066, Quad Bilateral Switch, 14-Pin DIP
The CD4066B device is a quad bilateral switch intended for the transmission or multiplexing of analog or digital signals. It is pin-for-pin compatible with the CD4016B device, but exhibits a much lower on-state resistance. In addition, the on-state resistance is relatively constant over the full signal-input range. The CD4066B device consists of four bilateral switches, each with independent controls. Both the p and the n devices in a given switch are biased on or off simultaneously by the control signal. As shown in Figure 17, the well of the n-channel device on each switch is tied to either the input (when the switch is on) or to VSS (when the switch is off).
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CMOS - CD4017, CMOS Decade Counter, 16-Pin DIP
CD4017B is a 5-stage Johnson counter having 10 decoded outputs, respectively. Inputs include a CLOCK, a RESET, and a CLOCK INHIBIT signal. Schmitt trigger action in the CLOCK input circuit provides pulse shaping that allows unlimited clock input pulse rise and fall times. These counters are advanced one count at the positive clock signal transition if the CLOCK INHIBIT signal is low. Counter advancement via the clock line is inhibited when the CLOCK INHIBIT signal is high. A high RESET signal clears the counter to its zero count. Use of the Johnson counter configuration permits high-speed operation, 2-input decode-gating and spike-free decoded outputs. Anti-lock gating is provided, thus assuring proper counting sequence. The decoded output are normally low and go high only at their respective decoded time slot. Each decoded output remains high for one full clock cycle.
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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
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Capacitor - 25V, Radial Lead, Electrolytic
High quality, radial leaded, aluminum electrolytic capacitors rated at 25VDC.
package of 5
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Diode - Zener, 5 Watt, ±5% tolerance
5W zener diodes that are great for use in tube amps. These are commonly used to drop B+ voltages for tube modification compatibility or to create low power modes for the amp. A zener is 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.
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3.5mm Jack - Qingpu, Eurorack, Mono, Switched Tip, Snap-In, PCM
3.5mm TS jacks with a switched tip found in many DIY Eurorack projects. The WQP-WQP518MA-BM is the new improved version of the WQP-PJ301BM featuring Qingpu’s rugged square based bushing. The sleeve connection is through the outer bracket that snaps into place on the pcb allowing for easy construction and panel fitting. Hardware sold separately. See accessory items below.
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Transistor - 2N3906, TO-92 case, PNP, Lead Free
General purpose low-power PNP bipolar junction transistor, used frequently in hobbyist electronic projects. This version is lead free.
For a lead free 2N3904 see P-Q2N3904-LF.
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Nut & Washer - Panel, for ⅜" Potentiometers
Replacement nut and washer for pots with a ⅜" bushing diameter.
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Resistors - ¼ Watt, Carbon Film, 5% tolerance
Carbon Film resistors are made by vacuum depositing a thin carbon film on a ceramic form. A good choice for applications which require a steady, low power drop. Package of 5. These resistors are perfect for pedal builders!
  • 1/4 watt
  • ± 5% tolerance
  • EIA color coded
  • .24" long x .08" diameter
  • Package of 5
package of 5
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