Synth & Eurorack Parts / DIY

MC78L05 5V Linear Regulator. Used in MOD® kits. The TI version is the LM78L05. This fixed-voltage monolithic integrated circuit voltage regulator is suitable for applications that required supply current up to 100 mA.

PCB mounted 3.5mm stereo jacks commonly found in DIY Eurorack projects. These are the newest version from Qingpu Electronics featuring a square bushing plate for added durability. Hardware sold separately. See accessory items below.

Replacement nut for CTS 450 series potentiometers and others.

• 3/8-32 threading
• Sold individually

The BD139 is a NPN medium power BJT transistor in a TO-126 package. The BD139's typical applications include audio amplifiers and drivers but is also popularly used in silicon fuzz pedals. The BD139 is available in two different gain ranges: BD139-10 and QBD139-16. Type hFE (IC=150mA, VCE=2V) BD139-10 63-160 BD139-16 100-250

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.

3.5mm TS jacks with a switched tip found in many DIY Eurorack projects. The WQP-WQP518MA-BM is the new improved version of the WQP-PJ301BM featuring Qingpu’s rugged square based bushing. The sleeve connection is through the outer bracket that snaps into place on the pcb allowing for easy construction and panel fitting. Hardware sold separately. See accessory items below.

2N4061 PNP transistors. This is a silicon PNP transistor in a TO-92 package. The 2N4061 has been used in a variety of effects pedals and is most notably used in the Zonk Machine II.

Very flexible, high flame retardant polyolefin heat shrink tubing. Unheated outer diameter of about 7.6 mm with a 2:1 shrink ratio. Resistant to common liquid solvents with excellent physical, chemical, and electrical performance.

J113 N-Channel Switch (TO-92 package) - designed for low level analog switching, sample and hold circuits and chopper stabilized amplifiers.

• Max drain to gate voltage = 35 V
• Max gate to source voltage = -35 V
• Max forward gate current = 50 mA

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)

LM311 single comparator IC in an 8-pin DIP package. The LM311 device is a single high-speed voltage comparator. These devices are designed to operate from a wide range of power supply voltages, including ±15-V supplies for operational amplifiers and 5-V supplies for logic systems. The output levels are compatible with most TTL and MOS circuits. These comparators are capable of driving lamps or relays and switching voltages up to 50 V at 50 mA. All inputs and outputs can be isolated from system ground. The outputs can drive loads referenced to ground, VCC+ or VCC−. Offset balancing and strobe capabilities are available, and the outputs can be wire-OR connected.

LM358 dual op amp in an 8-pin DIP package. These devices consist of two independent, high-gain, frequency-compensated operational amplifiers designed to operate from a single supply over a wide range of voltages. Operation from split supplies also is possible if the difference between the two supplies is 3 V to 32 V (3 V to 26 V for the LM2904), and VCC is at least 1.5 V more positive than the input common-mode voltage. The low supply-current drain is independent of the magnitude of the supply voltage. Applications include transducer amplifiers, dc amplification blocks, and all the conventional operational amplifier circuits that now can be implemented more easily in single-supply-voltage systems.

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

Metal Film resistors consist of a resistive element of an extremely thin layer of metal alloy vacuum deposited on a substrate. Precise and quiet. These 1/8W resistors have a very small body and are great for tight builds.

Metal Film resistors consist of a resistive element of an extremely thin layer of metal alloy vacuum deposited on a substrate. Precise and quiet. Package of 5. These resistors are perfect for pedal builders! 1/4 watt.

Surface mount MMBFJ201 JFET. Commonly used in place of the discontinued through-hole J201. These JFETs can be found in many effects pedals, synthesizers, and other projects. The MMBFJ201 is an N-Channel general purpose amplifier JFET. This device is designed primarily for low level audio and general purpose applications with high impedance signal sources.

PCB mounted 3.5mm mono jacks commonly found in DIY Eurorack projects. These are the newest version from Qingpu Electronics featuring a square bushing plate for added durability. Hardware sold separately. See accessory items below.

The 2N4123 is a general purpose silicon NPN transistor in a TO-92 case. The 2N4123 is primarily intended for general purpose amplification. It is a popular choice for silicon fuzz pedals due to its low hFE specifications.

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.

MPSA63 PNP Darlington transistor (TO-92 package) - designed for high gain, low noise general purpose amplifier applications.

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

General purpose low-power NPN bipolar junction transistor, used frequently in hobbyist electronic projects. This version is lead free.
For a lead free 2N3906 see P-Q2N3906-LF.

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.

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

Polyester film dielectric, aluminum foil electrode, copperply leads and epoxy resin coating in inductive type.

• Small size, light weight and low cost
• Dissipation factor is small because the leads are directly welded to electrodes
• Epoxy resin vacuum-dipped enhances the mechanical strength, humidity resistance
• 100 volt rating
• Operating temperature range: -40°C to +85°C.
• Package of 5