Synth & Eurorack Parts / DIY

Carling mini-toggle switch, SPDT. This switch features a flattened actuator.

• 0.354" bushing length
• 2-Position On/On
• ¼" mounting hole diameter
• Single pole/Double throw (SPDT)
• Solder Lugs

The CD4053B analog multiplexers are digitally-controlled analog switches having low ON impedance and very low OFF leakage current.

The AS3320 is Alfa’s version of the CEM3320 IC. The AS3320 is a high performance voltage controlled four-pole filter with on-chip voltage controllable resonance IC. The four independent sections may be interconnected to provide a wide variety of filter responses, such as low pass, high pass, band pass and all pass. A single input exponentially controls the frequency over greater than a ten octave range with little control voltage feedthrough. Another input controls the resonance in a modified linear manner from zero to low distortion oscillation. For those demanding applications, provision has been made to allow trimming for improved control voltage rejection. Each filter section features a variable gain cell which is fully temperature compensated, exhibits a better signal-to-noise ratio and generates its low distortion predominantly in the second harmonic. The device includes a minus two volt regulator to ensure low power dissipation and consequent low warm-up drift.

A semiconductor device which passes current in the forward direction(from anode to cathode), and blocks current in the opposite direction.

High-quality USA made knobs from Rogan Corp. These medium knobs feature a metal insert, spun aluminum inlay, and a skirt with an infilled arrow indicator. The RB-67 Series from Rogan is popularly used on Buchla 200 Series modular synthesizers and can be found on many contemporary eurorack synthesizers..

• Height: 0.77 in.
• Diameter: 1.15 in.
• Fits ¼" shaft with set screws

A variety of sizes and colors are available from the RB-67 Series. See the links below for the full selection of knobs from this series. P-K770-X Small P-K770S-X Small Skirted P-K771S-X Medium Skirted P-K772S-B Large Skirted

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

20kΩ W taper 16mm solid shaft potentiometers with solder lug terminals. 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: W

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.

Metal Film resistors consist of a resistive element of an extremely thin layer of metal alloy vacuum deposited on a substrate. Precise and quiet.

This nickel-plated brass adapter sleeve converts a 0.125 in. (3.17mm) shaft potentiometer to ¼" shaft (6.35mm), allowing for ¼" knobs to be used on a wider range of potentiometers. The cutout on the sleeve allows the set screw of the knob to secure directly to the shaft of the pot. Depending on the knob used, a longer set screw can be required.

LM380 power amp in a 14-pin DIP package. The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain is internally fixed at 34 dB. A unique input stage allows ground referenced input signals. The output automatically self-centers to one-half the supply voltage. The output is short circuit proof with internal thermal limiting. The package outline is standard dual-in-line. The LM380N uses a copper lead frame. The center three pins on either side comprise a heat sink.

Ceramic disc capacitor, 680 pF (.00068µF) rated for up to 50 V.
Non linear temperature coefficient of capacitance

High-quality USA made knobs from Davies Molding. The small skirted 1610 knob is made of solid phenolic and features an indicator line on the 0.91” diameter skirt. This classic knob has been used on a variety of equipment and most notably on the Buchla 100 Series as well as some 200 Series modules.

• Height: 0.59 in.
• Diameter: 0.91 in.
• Fits ¼" shaft with set screw

The large skirted 1600 knob is made of phenolic and features an indicator line on the 1.5” diameter skirt. This classic knob has been used on a variety of equipment and most notably on the Buchla 100 Series as well as some 200 Series modules.

• Height: 0.69 in.
• Diameter: 1.5 in.
• Fits ¼" shaft with set screw

Ideal for precision assembly work with close tolerances and applications needing a well tooled appearance.

Polyester Film Capacitor used in MOD® Pedal Kits. Rated at 0.047µF 50V. Tolerance: 10%. Operating temperature: -40 C to +85 C

High-quality USA made knobs from Rogan Corp. These small, 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 T18 knurled shafts.

• Height: 0.71 in.
• Diameter: 0.57 in.
• Fits T18 Knurled Shafts

For a D-shaft version of this knob, see P-K281PS-W. A variety of different sizes are available from the PT Series. See the links below for the full selection of knurled shaft knobs from this series. P-K271P-W 1P Small Pointer P-K272P-W 2P Medium Pointer P-K272PS-W 2PS Medium Skirted Pointer

Alpha Mini Pots with solid shaft and short PC mount terminals.

• Threading: M7 x 0.75
• Distance between terminals: 5 mm (0.197”)
• Lead Depth from Panel: 3.8 mm (0.150”)
• Lead Distance from shaft center: 12.5 mm + 3.5 mm (0.492” + 0.138”)
• Lead Thickness: 0.5 mm (0.020”)

MPSA14 NPN Darlington transistor (TO-92 package) - designed for high gain, low noise general purpose amplifier applications.

• Max collector to emitter voltage = 30 V
• Max collector to base voltage = 30 V
• Max emitter to base voltage = 10 V
• Max collector current = 0.5 A (continuous)

Carling, SPDT mini toggle, 2 positions, ¼" mounting hole diameter, 0.354" bushing length.

1N4742A 12V zener diode in a DO-41 package. 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.

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.

Black 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 40 x 20 holes (20 strips). 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
• HASL coated strips
• 40 x 20 holes (20 strips)
• 6.14” x 3.15”

Looking for projects? See our Wide Stripboard projects in our Pedal Layouts & Build Guides section for ideas.

2N404 PNP germanium transistors. The 2N404 is used in many fuzz pedals along with other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors. For a higher voltage version of this transistor, see P-Q2N404A.

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.