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.
CMOS - CD4007, Dual Complementary Pair Plus Inverter, 14-Pin DIP
CD4007UB types are comprised of three n-channel and three p-channel enhancement-type MOS transistors. The transistor elements are accessible through the package terminals to provide a convenient means for constructing the various typical circuits as shown in Fig. 2. More complex functions are possible using multiple packages. Numbers shown in parentheses indicate terminals that are connected together to form the various configurations listed. Features:
  • Standardized symmetrical output characteristics
  • Medium Speed Operation — tPHL, tPLH = 30 ns (typ.) at 10 V
  • 100% tested for quiescent current at 20 V
  • Meets all requirements of JEDEC Tentative Standard No.
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CMOS - CD4052, 4:1, 2-Channel General-Purpose Multiplexer, 16-Pin DIP
The CD4052B analog multiplexers are digitally-controlled analog switches having low ON impedance and very low OFF leakage current.
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CMOS - CD4013, Dual D-Type Flip-Flop, 14-Pin DIP
The CD4013B device consists of two identical, independent data-type flip-flops. Each flip-flop has independent data, set, reset, and clock inputs and Q and Q outputs. These devices can be used for shift register applications, and, by connecting Q output to the data input, for counter and toggle applications. The logic level present at the D input is transferred to the Q output during the positive-going transition of the clock pulse.
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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 - CD4016, Quad Bilateral Switch, 14-Pin DIP
CD4016B Series types are quad bilateral switches intended for the transmission or multiplexing of analog or digital signals. Each of the four independent bilateral switches has a single control signal input which simultaneously biases both the p and n device in a given switch on or off. Features:
  • 20-V digital or ± 10-V peak-to-peak switching
  • 280- typical on-state resistance for 15-V operation
  • Switch on-state resistance matched to within 10 typ. over 15-V signal-input range
  • High on/off output-voltage ratio: 65 dB typ. @ fis = 10 kHz, RL = 10 k
  • High degree of linearity: <0.5% distortion typ. @ fis = 1 kHz, Vis = 5 Vp-p, VDD–VSS
  • Extremely low off-state switch leakage resulting in very low offset current and high effective off-state resistance: 100pA typ.
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CMOS - CD4070, Quad XOR (Exclusive-OR) Gates, 14-Pin DIP
The CD4070B contains four independent Exclusive-OR gates. The CD4070B provides the system designer with a means for direct implementation of the Exclusive-OR functions, respectively. Features:
  • High-Voltage Types (20V Rating)
  • CD4070B - Quad Exclusive-OR Gate
  • Medium Speed Operation
  • tPHL, tPLH = 65ns (Typ) at VDD = 10V, CL = 50pF
  • 100% Tested for Quiescent Current at 20V
  • Standardized Symmetrical Output Characteristics
  • 5V, 10V and 15V Parametric Ratings
  • Maximum Input Current of 1µA at 18V Over Full Package Temperature Range
  • 100nA at 18V and 25°C
  • Noise Margin (Over Full Package Temperature Range)
  • 1V at VDD = 5V, 2V at VDD = 10V, 2.5V at VDD = 15V
  • Meets All Requirements of JEDEC Standard No.
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CMOS - CD4021, 8-Stage Static Shift Register, 16-Pin DIP
CD4021B series types are 8-stage parallel- or serial-input/serial output registers having common CLOCK and PARALLEL/SERIAL CONTROL inputs, a single SERIAL data input, and individual parallel "JAM" inputs to each register stage. Each register stage is D-type, master-slave flip-flop. In addition to an output from stage 8, "Q" outputs are also available from stages 6 and 7. In the CD4021B serial entry is synchronous with the clock by parallel entry is asynchronous. Entry is controlled by the PARALLEL/SERIAL CONTROL input. When the PARALLEL/SERIAL CONTROL input is low, data is serially shifted into the 8-stage register synchronously with the positive transition of the clock line. When the PARALLEL/SERIAL CONTROL input is high, data is jammed into the 8-stage register via the parallel input lines and synchronous with the positive transition of the clock line.
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Transistor - NOS 2N3565, Micro Electronics, Silicon, TO-106 case, NPN
New old stock 2N3565 transistors manufactured by Micro Electronics. The 2N3565 is a silicon NPN transistor in a TO-106 case. The 2N3565 is primarily intended for general purpose and low level applications. 2N3565 transistors were used in the original Harmonic Percolator, Foxx Tone Machine and the Sam Ash Fuzzz Boxx.
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Transistor - NOS 2N404A, TI, Germanium, Gold Lead TO-5 Case, PNP
New old stock 2N404A PNP germanium transistors manufactured by Texas Instruments. These TI 2N404A feature gold plated leads. The 2N404A is used in many fuzz pedals along with other effects. The 2N404A is the same as the 2N404 but with a higher voltage rating. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.
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Resistor - Carbon Film, Zero Ohm
Package of 5
Zero ohm (0Ω) resistors in a carbon film axial package. These resistors are a similar size to most common 1/4W carbon film and metal film resistors. Zero ohm resistors are useful as pcb jumpers as well as point to point jumpers. These can also be useful for true bypass 3PDT wiring.
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Transistor - SFT353, Germanium, 18B4 case, PNP
SFT353 PNP germanium transistors. The SFT353 is a popular PNP for fuzz pedals and other effects. This transistor is in a 18B4 package with long leads commonly found on germanium transistors. This style of package can be found in Italian built Vox Tonebenders.
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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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Trimmer - BI Technologies, Sealed, Cermet , Top Adjust, 10kΩ
High-quality BI Technologies Model 82 trimpots. These single-turn cermet trimmers are sealed ensuring a long life. They feature long leads (0.62”) making them a great choice for point to point builds in addition to PCB mounting. The simplistic design also looks great in vintage style builds.
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Transistor - NTE123, Silicon, TO-5 case, NPN
NTE123 NPN silicon transistors. The NTE123 is a popular NPN for fuzz pedals and other effects. This transistor is in a TO-5 package. The NTE123 was used in the Texas Square Face made by Cesar Diaz, the famous amp tech who worked with Stevie Ray Vaughan and others. Early in his career, SRV had a broken Fuzz Face pedal and took it to Cesar Diaz to have him fix it. Diaz fixed and modified the pedal and this became the foundation of his famous version which he named the Texas Square Face. The Diaz pedals often came socketed and included a set of NTE123 along with the standard pair of P-QNTE103 to experiment with the different sounds of the transistors.
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Transistor - NTE103, Germanium, TO-5 case, NPN
NTE103 NPN germanium transistors. The NTE103 is a popular NPN for fuzz pedals and other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors. The NTE103 was used in the Texas Square Face made by Cesar Diaz, the famous amp tech who worked with Stevie Ray Vaughan and others. Early in his career, SRV had a broken Fuzz Face pedal and took it to Cesar Diaz to have him fix it. Diaz fixed and modified the pedal and this became the foundation of his famous version which he named the Texas Square Face. The Diaz pedals often came with socketed NTE103 and included a set of P-QNTE123 to experiment with the different sounds of the transistors.
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Transistor - TI377, Germanium, SO-2 metal case, PNP
TI377 PNP germanium transistors from Texas Instruments. The TI377 is a great PNP for fuzz pedals and other effects. This transistor is in a metal SO-2 package with long leads commonly found on germanium transistors. This package with the gold leads visually matches the 2G308, 2G309, and 2G381 transistors found in Zonk and Tonebender MKI fuzz pedals.
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Transistor - AC132K, Germanium, Heatsink TO-1 case, PNP
AC132K PNP germanium transistors. The AC132K is a popular PNP for fuzz pedals and other effects. This transistor is in a thick rectangular heat-sink package with long leads commonly found on germanium transistors.
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Transistor - BC238B, Silicon, TO-92 case, NPN
BC238B NPN transistor in a TO-92 package. The BC238 is used in a variety of vintage pedals such as the Schaller Fuzz, a version of the Brian May treble boost,and later Jen / Tonebender fuzz pedals. The BC238B is a variant of the BC108B and works well in other classic fuzz pedals such as Fuzz Face and Big Muff builds.
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Transistor - OC42, Germanium, SO-2 glass case, PNP
OC42 PNP germanium transistors. The OC42 is a popular PNP for fuzz pedals and boost effects. It can be found in vintage electronics and modern fuzz pedals. This transistor is in a black glass SO-2 package with long leads commonly found on germanium transistors.
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Transistor - OC83N, Germanium, TO-1 case, PNP
OC83N PNP germanium transistors. The OC83N is a great PNP for fuzz pedals and boost effects. It is the TO-1 version of the OC83 which can be found in many fuzz pedals such as MK1.5 and MKII Tonebender clones. This transistor features long leads commonly found on germanium transistors.
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Transistor - 2N2646 Programmable Unijunction
2N2646 programmable unijunction transistor often referred to as a PUT. The 2N2646 can be found in many tremolo effects pedal projects and vintage classics such as the Vox Repeat Percussion.
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Transistor - BC148C, Silicon, Lockfit case, NPN
BC148C NPN transistor in a rare Mullard Lockfit package. The BC148C is the equivalent of a BC108C but in the Lockfit package rather than a TO-18. The BC148C was used in a variety of audio and radio equipment and works well for fuzz and other effects.
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Transistor - OC41, Germanium, SO-2 glass case, PNP
OC41 PNP germanium transistors. The OC41 is a popular PNP for fuzz pedals and boost effects. It can be found in vintage electronics and modern fuzz pedals. This transistor is in a black glass SO-2 package with long leads commonly found on germanium transistors.
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Transistor - OC46, Germanium, SO-2 glass case, PNP
OC46 PNP germanium transistors. The OC46 is a popular PNP for fuzz pedals and boost effects. It can be found in vintage electronics and modern fuzz pedals. This transistor is in a black glass SO-2 package with long leads commonly found on germanium transistors.
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