Synth & Eurorack Parts / DIY

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. The BC183 is available in three different gain ranges: BC183A, BC183B, and BC183C. Type hfe (IC=2mA, VCE=5V, f=1KHz) BC183A 125-260 BC183B 240-500 BC183C 450-900

Audio taper (log), right angle, 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.

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.

Large black plastic control knob with set screw and brass insert. This distinctive pointer knob is similar to the selector knobs used on original MiniMoog and Moog modular synths. It features a triangular pointer, a radial brushed metal top, and a line indicator. The large skirt has a diameter of 1.125 inches. Fits ¼” (6.35mm) pot shafts.

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.

Rubber caps / switch tips for mini toggle switches in a variety of colors. These are made for short sized toggle bats. Available in 11 different colors. See P-HTCAP-X for standard-length caps.

PCB for converting SMD SSOP-16 packages to through hole DIP-16 footprints. Solder the device to this PCB then attach pin headers (sold seperately) to connect to through hole footprints on PCBs, breadboards and IC sockets.

Carling, SPDT mini toggle with short actuator, 3 positions, ¼" mounting hole diameter, 0.354" bushing length.

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

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).

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.

1N5408 Diode. Lead mounted standard recovery rectifiers are designed for use in power supplies and other applications having need of a device with the following features:

• High Current to Small Size
• High Surge Current Capability
• Low Forward Voltage Drop

High-quality USA made knobs from Rogan Corp. These large 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: 1.02 in.
• Diameter: 1.52 in.
• Fits ¼" shaft with set screw

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

High brightness 3mm LED. Great for use in pedal builds and other applications where a bold, bright, indicator is needed. Multiple colors available.

• 3mm size
• Water clear
• High brightness
• Multiple colors available
• Package of 5

100kΩ dual-gang 16mm potentiometers with a solid shaft and an audio taper. These pots have solder lug terminals. 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: Audio (Log)

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.

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.

Lumberg panel mount barrel jack with solder lugs.This DC jack features a normally closed switch on the ring (sleeve) connection. For use with barrel plugs with a 5.5mm external diameter and 2.1mm internal diameter. Mounting nut included.

LM833 dual op amp in an 8-pin dip package. The LM833 is a dual general purpose operational amplifier designed with particular emphasis on performance in audio systems. This dual amplifier IC utilizes new circuit and processing techniques to deliver low noise, high speed and wide bandwidth without increasing external components or decreasing stability. The LM833 is internally compensated for all closed loop gains and is therefore optimized for all preamp and high level stages in PCM and HiFi systems. The LM833 is pin-for-pin compatible with industry standard dual operational amplifiers. Features

• Wide dynamic range: >140dB
• Low input noise voltage: 4.5nV/ √ ^Hz
• High slew rate: 7 V/μs (typ); 5V/μs (min)
• High gain bandwidth: 15MHz (typ); 10MHz (min)
• Wide power bandwidth: 120KHz
• Low distortion: 0.002%
• Low offset voltage: 0.3mV
• Large phase margin: 60°

NPN Darlington transistor (TO-92 package) - designed for applications requiring extremely high current gain at collector currents to 1.0A.

• Max collector to emitter voltage = 30 V
• Max collector to base voltage = 30 V
• Max emitter to base voltage = 10 V
• Max collector current = 1.2 A (continuous)

High-quality USA made knobs from Davies Molding. The small 1400 pointer knob is made of solid phenolic and features a fine ridged grip with a distinctive point. This classic knob has been used on a variety of guitar pedals and audio equipment such as the Pultec EQP-1A.

• Height: 0.38 in.
• Length: 0.84 in.
• Fits ¼" shaft with set screw

This brass adapter sleeve converts a 6mm shaft potentiometer or 18T knurled shaft potentiometer to 1/4" shaft (6.35mm), allowing for 1/4" knobs to be used on a wider range of potentiometers. 1/4" tall.

Polyester Film Capacitor used in MOD® Pedal Kits. Rated at 0.1µF 50V. Tolerance: 10%. Operating temperature: -40 C to +85 C

High-quality USA made knobs from Rogan Corp. These small 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: 0.55 in.
• Diameter: 0.45 in.
• Fits T18 Knurled Shafts

For a D-shaft version of this knob, see P-K281P-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-K271PS-W 1PS Small Skirted Pointer P-K272P-W 2P Medium Pointer P-K272PS-W 2PS Medium Skirted Pointer

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

• Threading: M7 x 0.75
• Distance between terminals: 5 mm (0.197”)
• Lead Depth from Panel: 10.7 mm + 5 mm (0.421” + 0.197”)
• Lead Distance from shaft center: 16 mm (0.630”)
• Lead Thickness: 0.5 mm (0.020”)