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.
¼" Jack - Switchcraft, Enclosed, Stereo
The Switchcraft Type 112BX enclosed ¼” jack is a high quality jack. This jack has three solder lugs. One for the tip, one for the ring, and one for the sleeve. These jacks have been widely used across the industry and can also be found in many popular 5U synthesizers. Includes nut and washer.
  • Type 112BX
  • 0.276" bushing length (standard)
  • Mates with standard ¼" plugs and is available with 0.25" inside diameter bushing.
  • Stereo 3-Conductor
  • Includes nut and washer

See W-SC-111X for mono version
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¼" Jack - Switchcraft, Enclosed, Mono
The Switchcraft Type 111X enclosed ¼” jack is a high quality mono jack. This jack has two solder lugs. One for the tip and one for the sleeve. These jacks have been widely used across the industry and can also be found in many popular 5U synthesizers. Includes nut and washer.
  • Type 111X
  • 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

See W-SC-112BX for stereo
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Trimmer - Bourns, 3362P, Single Turn, Top Adjust, PCB Mount
High-quality Bourns 3362P trimpots. These single-turn cermet trimmers can be found in countless guitar pedals and synthesizer modules. Sealed trimmers are built with an o-ring seal to prevent entrance of moisture and serve as a mechanical restraint to prevent unwanted wiper movement. ±10% tolerance.
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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.
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StripBoard - Single Sided, 3.04” x 1.55”, Vintage Spacing
Colors Available:
Stripboard featuring a 0.15” vintage spacing. This spacing is great for vintage-style builds and more easily accommodates axial capacitors and other larger sized vintage parts like resistors and transistors. The board has a 20x10 grid (10 strips) and easily fits into 1590BB style enclosures and larger vintage-style fuzz enclosures. Each strip is HASL coated making soldering easier than most protoboards and also ensures a long shelf life. Features:
  • High-quality 1.6mm FR4 glass-epoxy circuit board
  • 1oz/ft2 copper weight
  • HASL coated strips
  • 20 x 10 holes (10 strips)
  • 3.04” x 1.55”
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PadBoard - Single Sided, 3.04” x 1.55”, Vintage Spacing
Colors Available:
Padboard featuring a 0.15” vintage spacing. This spacing is great for vintage-style builds and more easily accommodates axial capacitors and other larger sized vintage parts like resistors and transistors. The board has a 20x10 grid of pads and easily fits into 1590BB style enclosures and larger vintage-style fuzz enclosures. Each square pad is HASL coated making soldering easier than most protoboards and also ensures a long shelf life. Features:
  • High-quality 1.6mm FR4 glass-epoxy circuit board
  • 1oz/ft2 copper weight
  • HASL coated square shaped pads
  • 20 x 10 holes
  • 3.04” x 1.55”
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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.
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Power Jack - DC Panel Mount, 5.5mm External, 2.1mm Internal
Colors Available:
New!:
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.
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Dust Cap - For DC Power Jack, Standard Size
Dust cover for standard size 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.
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Transistor - AS394H, Matched Pair, Alfa, TO5-8 case, NPN
The AS394H 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.
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Power Jack - Lumberg, DC Panel Mount, Snap-in, 5.5mm External, 2.1mm Internal
Snap-in Lumberg panel mount barrel jack with solder lugs. This high quality jack is a similar size to the Lumberg low profile jack but easily snaps into place with no need to thread a nut inside the chassis. For use with barrel plugs with a 5.5mm external diameter and 2.1mm internal diameter.
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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.
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Transistor - AS3046, Array of 5, Matched Pair, 14-Pin DIP, NPN
The AS3046 is Alfa’s version of the CA3046 IC. The AS3046 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 AS3046 is available in a 14-pin DIP package.
Features
  • Matched pair of npn transistors
  • VBE matched less than ±1 mV
  • 5 general purpose monolithic transistors
  • Wide operating current range

Applications
  • Filters
  • Custom designed differential amplifiers
  • Temperature compensated amplifiers
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OTA - AS3080E, Linearizing Diodes, Alfa, 8-Pin DIP
The AS3080E is Alfa’s version of the CA3080 IC. The AS3080E is a gain block which is the operational-transconductance-amplifier (OTA). The AS3080E has differential input and a single-ended, push-pull, class A output. Amplifier bias
input may be used either for gating or for linear gain control. High output impedance and transconductance (gM) is directly proportional to the amplifier bias current (IABC). Linearizing diodes are provided at the inputs to reduce distortion and allow higher input levels. The result is a 10-dB signal-to-noise improvement referenced to 0.5 percent THD.
The AS3080E is notable for it’s high slew rate (50V/µs), which makes it especially useful for multiplexer and fast unity-gain voltage followers.
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OTA - AS3280, Dual, Linearizing Diodes, Alfa, 16-Pin DIP
The AS3280 is Alfa’s version of the CA3280 IC. The AS3280 consists of two variable operational amplifiers that are designed to substantially reduce the initial input offset voltage and the offset voltage variation with respect to changes in programming current. This design results in reduced "AGC thump," an objectionable characteristic of many AGC systems. Careful design of critical places of the circuit reduces the amplifier dependence upon thermal and processing variables.
The AS3280 has all the generic characteristics of an operational voltage amplifier except that the forward transfer characteristics is best described by transconductance rather than voltage gain, and the output is current, not voltage. The magnitude of the output current is equal to the product of transconductance and the input voltage.
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Integrated Circuit - AS3310, VC ADSR, Alfa, 16-Pin Dip
The AS3310 is Alfa’s version of the CEM3310 IC. The AS3310 is a self-contained, precision ADSR type of envelope generator intended for electronic music and other sound generation applications. Attack, decay and release times are exponentially voltage controllable over a wide range, and the sustain level is linearly voltage controllable from 0 to 100% of the peak voltage Vp. All four control Inputs are Isolated from the rest of the circuitry so that the control pins of tracking units may be simply tied together.
On the negative power output, there is an internal Zener diode at 7.4 volts ± 10%, which allows the chip to supply a maximum voltage of ± 15 volts with a current-limiting resistor REE, and a minimum positive supply voltage of + 11 volts and a minimum negative supply voltage of -5 volts.. A series current limiting resistor must be added between pin 6 and the supply.
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Integrated Circuit - AS3340A, VCO, Alfa, 16-Pin Dip
The AS3340A is Alfa’s version of the CEM3340 IC. The AS3340A is a completely self-contained, precision voltage controlled oscillator, featuring both exponential and linear control scales and up to four buffered output waveforms: triangle, sawtooth, square, and pulse with voltage controllable pulse width. Full temperature compensation makes these VCOs extremely stable, and eliminates the need for a temperature compensation resistor. The highly accurate exponential and linear control inputs are virtual ground summing nodes, allowing multiple control voltages to be mixed within the device itself.
Also included is provision for hard and soft synchronization of the frequency, and an output for easy adjustment of high frequency tracking. Special care in the design ensures oscillation start-up under any power-on sequence and supply conditions.
An on-chip 7.4 volt Zener diode allows the device to operate off ±15 volt supplies, as well as +12, -5 volt supplies.
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Transistor - AS394CH, Matched Pair, Alfa, TO5-8 case, NPN
The AS394CH 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.
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Transistor - AS395H, Matched Pair, Alfa, TO5-8 case, PNP
The AS395 dual monolithic PNP transistor offers excellent parametric matching and high frequency performance. Low noise characteristics (1 nV/√Hz typ @ 1 kHz), high bandwidth (190 MHz typical), and low offset voltage (100 µV max), makes the AS395 an excellent choice for demanding preamplifier applications.Tight current gain matching (3% max mismatch) and high current gain (100 min), over a wide range of collector current, makes the AS395 an excellent choice for current mirrors. A low value of bulk resistance makes the AS395 an ideal component for applications requiring accurate logarithmic conformance. To ensure the long-term stability of the matching parameters, internal protection diodes across the base-emitter junction clamp any reverse base-emitter junction potential.
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OTA - LM13700, Dual, Linearizing Diodes and Buffers, 16-Pin DIP
The LM13700 series consists of two current controlled transconductance amplifiers, each with differential inputs and a push-pull output. The two amplifiers share common supplies but otherwise operate independently. Linearizing diodes are provided at the inputs to reduce distortion and allow higher input levels. The result is a 10-dB signal-to-noise improvement referenced to 0.5 percent THD. High impedance buffers are provided which are especially designed to complement the dynamic range of the amplifiers. The output buffers of the LM13700 differ from those of the LM13600 in that their input bias currents (and thus their output DC levels) are independent of IABC.
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Transistor - AS194H, Matched Pair, Alfa, TO5-8 case, NPN
The AS194H 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.
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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

Applications
  • Filters
  • Custom designed differential amplifiers
  • Temperature compensated amplifiers
Please Log In to view prices
OTA - AS3080ED, Linearizing Diodes, Alfa, SOIC-8
The AS3080ED is Alfa’s version of the CA3080 IC in an SOIC package. The AS3080ED is a gain block which is the operational-transconductance-amplifier (OTA). The AS3080ED has differential input and a single-ended, push-pull, class A output. Amplifier bias input may be used either for gating or for linear gain control. High output impedance and transconductance (gM) is directly proportional to the amplifier bias current (IABC). Linearizing diodes are provided at the inputs to reduce distortion and allow higher input levels. The result is a 10-dB signal-to-noise improvement referenced to 0.5 percent THD.
The AS3080ED is notable for it’s high slew rate (50V/µs), which makes it especially useful for multiplexer and fast unity-gain voltage followers.
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OTA - AS3280D, Dual, Linearizing Diodes, Alfa, SOIC-16
The AS3280 is Alfa’s version of the CA3280 IC in an SOIC package. The AS3280D consists of two variable operational amplifiers that are designed to substantially reduce the initial input offset voltage and the offset voltage variation with respect to changes in programming current. This design results in reduced "AGC thump," an objectionable characteristic of many AGC systems. Careful design of critical places of the circuit reduces the amplifier dependence upon thermal and processing variables.
The AS3280D has all the generic characteristics of an operational voltage amplifier except that the forward transfer characteristics is best described by transconductance rather than voltage gain, and the output is current, not voltage. The magnitude of the output current is equal to the product of transconductance and the input voltage.
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