Synth & Eurorack Parts / DIY

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.

The 2N5172 is a silicon general purpose NPN transistor in a TO-92 package. The 2N5172’s typical applications include general purpose amplification and switching.

PCB for converting SMD SOIC-14 packages to through hole DIP-14 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. This adapter is also compatible with SOP-14 packages.

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.

The CD4052B analog multiplexers are digitally-controlled analog switches having low ON impedance and very low OFF leakage current.

Dual wide-bandwidth LF353 opamps in an 8-pin DIP package. The LF353 offers a high input impedance and 3MHz bandwidth.
This LF353 device is a low-cost, high-speed, JFET input operational amplifier with very low input offset voltage. It requires low supply current yet maintains a large gain-bandwidth product and a fast slew rate. In addition, the matched high-voltage JFET input provides very low input bias and offset currents.

A great digital reverb sound that easily replaces a spring reverberation unit. Simple interface requires only input, output, +5V, and ground. Output requires no external capacitors.

Premium three position DPDT submini toggle switches from Gorva Design. The Bascular Sub Mini switches have a medium 7.37mm actuator length. These switches feature silver plated copper alloy contacts. The bushing is smooth and the switch is secured with the mounting bracket on the PCB. RoHS compliant & lead-free. Details

• 5.59mm non-threaded bushing
• 3-Position On/On/On
• 4.95mm panel hole diameter
• Double pole/Double throw (DPDT)
• PC Pins

Features

• Power Rating: DC9V, 1A
• Contact Resistance: <20mΩ
• Insulation Resistance: 1000MΩ Minimum
• Dielectric Strength: 1000V RMS @ Sea Level
• Operating Temperature: -40°C ~ +85°C
• Electrical Life: 30,000 Cycles
• RoHS & Lead-free

For Yamaha DX7, DX7 II, FX20, Korg M1, Trinity and T Series.

The SB400 Solderable PCB BreadBoard enables you to transfer your circuit and wires from a plug-in breadboard without recutting wires or changing your layout. The SB400 has the same pattern and spacing as a standard 400 connection point BB400 solderless plug-in breadboard. It has a standard 5-hole strip for each IC pin, just like solderless breadboards plus 4 power rails. However, it has the advantage that soldered joints provide a more reliable long-term connection than solderless contacts. The SB400 has four power rails like solderless breadboards, plus two bonus rails for power or signals. There are bonus two-hole pads along the centerline allowing DIL (dual in-line) headers to be used. BPS prototyping boards use high-quality FR4 glass epoxy PCBs for long life, with an anti-tarnish protective coating for easy soldering.

PCB for converting SMD SSOP-20 SSI2140 chips to through hole DIP-18 SSM2040 chips. This adapter makes the SSI2140 pin for pin compatible with the original IC. Solder the device to this PCB then attach pin headers (sold seperately) to connect to through hole footprints on PCBs, breadboards and IC sockets.

The Sound Semiconductor DAB2130 is a pre-soldered DIP converter for the SSI2130. This board features the SSI2130 and two decoupling caps for the V+ and V- inputs. The pinout is labelled on the board and matches the QFN pinout. This adapter features a 32 pin DIP base with a .600 in. width. The pins are standard male headers so 2.54mm female headers are recommended for socketing the board. For the standard QFN version, please see P-Q-SSI2130. The first new VCO IC in decades, and worth the wait! The FatKeys™ SSI2130 Voltage Controlled Oscillator provides beautiful triangle, sawtooth, pulse, and square waveforms with unprecedented temperature stability; and adds an on-chip mixer, low distortion sine wave generator, through-zero FM/PM capability and more in an ultra-compact PCB footprint. The SSI2130 is a new-generation voltage controlled oscillator subsystem for high-performance electronic musical instruments.

The BC548 is a silicon general purpose NPN transistor in a TO-92 package. The BC548’s typical applications include signal processing, amplification, and switching. The BC548 is available in two different gain ranges: BC548B and BC548C. Type hFE (IC=2mA, VCE=5V) BC548B 200-450 BC548C 420-800

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.

Combination Drive, Nickel, 6mm, 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.

High quality right angled 10-pin headers. Right angled headers are perfect for compact eurorack builds. The durable glass filled polyester shroud makes soldering these shrouded headers a simple task.

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.

Reverse audio taper (antilog), right angle, Alpha pots with a 6.35mm shaft diameter. These 9mm pots are poplar in DIY guitar pedals, synthesizers, and other projects. Mounting nut and washer included.

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.

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

The ZipWire™ Kit provides a convenient way to connect the signals in your projects. The wires can be unzipped for individual wires as needed and the color-coding can be used to organize power, ground and other signal types to keep your circuit organized. The rainbow colored ribbon cable provides the 10 standard electrical colors.

2N1307 PNP germanium transistors. The 2N1307 is a popular PNP for fuzz pedals and other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.

This is a set of two 2N1309 germanium transistors that have been hand-selected to work in the germanium Fuzz Face circuit. Also included are 4 metal film resistors to use in the circuit. In most cases, the values have been modified from the stock values slightly to ensure that the collector of Q2 biases to roughly -4.5V. A data sheet containing the schematic and the resistor values is included so that you can use your own resistor type if you would prefer. There is a range of bias voltages that can sound nice in a Fuzz Face, and voltages in original units varied. These transistors have been tested with bias voltage, sound, and noise level in mind. Note that due to a variety of factors such as battery/PSU voltage, temperature, and component tolerance, the voltage on the collector of Q2 may not measure at exactly -4.5V, but it should be close in a properly-built circuit.

Linear taper, vertical mount, Alpha pots with a 6.35mm shaft diameter featuring 11 detents across the rotation. The 11 detent versions are useful for builds where 1-10 settings are commonly used or if the pot is used as a rotary switch along with a microcontroller. These 9mm pots are popular in DIY guitar pedals, synthesizers, and other projects. Mounting nut and washer included. See R-VAV-A100K-11DET for an audio taper version.