Synth & Eurorack Parts / DIY

OP275 dual audio op amp in an 8-pin DIP package. The OP275 is the first amplifier to feature the Butler Amplifier front end. This new front end design combines both bipolar and JFET transistors to attain amplifiers with the accuracy and low noise performance of bipolar transistors, and the speed and sound quality of JFETs. Total Harmonic Distortion plus Noise equals that of previous audio amplifiers, but at much lower supply currents. A very low l/f corner of below 6 Hz maintains a flat noise density response. Whether noise is measured at either 30 Hz or 1 kHz, it is only 6 nVHz. The JFET portion of the input stage gives the OP275 its high slew rates to keep distortion low, even when large output swings are required, and the 22 V/µs slew rate of the OP275 is the fastest of any standard audio amplifier.

Stripboard made with a phenolic substrate. Phenolic boards are found in many vintage electronics before the use of fiberglass became common. This stripboard features standard 0.1” (2.54mm) spacing. The board has a 30x15 grid (15 strips) and easily fits into 1590BB style enclosures and larger vintage-style fuzz enclosures. Each strip is gold coated making soldering easier than most protoboards and also ensures a long shelf life. Features:

• High-quality 1.6mm phenolic circuit board
• Gold coated strips
• 30 x 15 holes (15 strips)
• 3.04” x 1.55”

Stripboard made with a phenolic substrate. Phenolic boards are found in many vintage electronics before the use of fiberglass became common. This stripboard features 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 a 20x10 grid (10 strips) and easily fits into 1590BB style enclosures and larger vintage-style fuzz enclosures. Each strip is gold coated making soldering easier than most protoboards and also ensures a long shelf life. Features:

• High-quality 1.6mm phenolic circuit board
• Gold coated strips
• 20 x 10 holes (10 strips)
• 3.04” x 1.55”

The BC182 is a general purpose NPN transistor in a TO-92 case. The BC182 is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz. The BC182 has a more narrow hFE range than the BC183 which can be helpful for certain builds.

TC1044 charge pump voltage converter in an 8 pin DIP package. The TC1044S is a pin-compatible upgrade to the Industry standard TC7660 charge pump voltage converter. It converts a +1.5V to +12V input to a corresponding –1.5V to –12V output using only two low cost capacitors, eliminating inductors and their associated cost, size and EMI. Added features include an extended supply range to 12V, and a frequency boost pin for higher operating frequency, allowing the use of smaller external capacitors. The on-board oscillator operates at a nominal frequency of 10kHz. Frequency is increased to 45kHz when pin 1 is connected to V+.

1N60 point-contact germanium diodes in a DO-7 package with striped clear glass. 1N60 diodes were used in many vintage electronics and also make for great clipping diodes in stompbox effects pedals.

IC component sockets for dual in-line package chips (DIP, PDIP, DIL, DIPP.) These sockets feature ladder style cases with tinned stamped and formed connections.

This nickel-plated steel adapter sleeve converts a 4mm shaft potentiometer to 6mm shaft, allowing for 6mm knobs to be used on a wider range of potentiometers. An additional 6mm to 6.35mm adapter R-VADAPT-25 can then be used to fit 1/4” knobs (sold seperately).

High quality R82 Series box film capacitors from Kemet. These polyester film capacitors have 5mm lead spacing, a minimum voltage rating of 63VDC, and a tolerance of ±10% or better. The small size, high specifications, and radial mounting makes them an excellent choice for PCB builds of pedals, synthesizer, and other audio equipment. The R82 Series is constructed of metallized polyester film with radial leads of tinned wire. Radial leads are electrically welded to the contact metal layer on the ends of the capacitor winding. The capacitor is encapsulated with thermosetting resin in a box of material meeting the UL 94V–0 requirements.

• Voltage rating: 63 VDC Minimum
• Lead Spacing: 5 mm
• Capacitance tolerance: ±10% or better
• Operating temperature range of -55˚C to +105˚C
• RoHS compliance and lead-free terminations
• Self-healing

2N797 NPN germanium transistors. The 2N797 is a popular NPN for fuzz pedals and other effects. The NPN polarity allows for use with standard pedal power supplies. The 2N797 is a fairly unique germanium transistor since it is in a TO-18 package.

J201 N-Channel JFET in a TO-92 package. The J201 is designed primarily for low level audio and general purpose applications with high impedance signal sources.

• Max drain to gate voltage = 40 V
• Max gate to source voltage = -40 V
• Max forward gate current = 50 mA

The BC209C is a silicon NPN transistor in a TO-106 case. The BC209C is primarily intended for general purpose audio applications. BC209C transistors were used in original silicon Fuzz Face® pedals as well as a variety of D*A*M pedals.

OC141 NPN germanium transistors. The OC141 is a popular NPN for fuzz pedals and boost effects. This transistor is in a glass SO-2 package with long leads commonly found on germanium transistors. The NPN polarity allows for use with standard pedal power supplies. The dot indicates the collector lead.

2N2430 NPN germanium transistors. The 2N2430 is a popular NPN for fuzz pedals and other effects. The NPN polarity allows for use with standard pedal power supplies.

2SD77 NPN germanium transistors. The 2SD77 is a popular NPN for fuzz pedals and other effects. The NPN polarity allows for use with standard pedal power supplies.

NOS OA74A germanium diodes from Amperex. OA74A diodes were used in many vintage electronics and also make for great clipping diodes in stompbox effects pedals. The red end is the cathode. OA74A is a near-exact replacement for OA81.

2N2613 PNP germanium transistors. The 2N2613 is a popular PNP for fuzz pedals and other effects. It was used in the Gibson Maestro FZ-1A and the Selmer Buzz Tone. This transistor is in a TO-1 package with long leads commonly found on germanium transistors.

2 to 1 heat shrink tubing variety pack. This pack includes six different diameters with four pieces of each size. Each piece is six inches in length. Features:

• Resistant to common fluids and solvents
• UL and CSA listed
• UV resistant
• Meets DEF. STAN 59.97
• Meets UL 224, 125°C and CSA C22.2 No. 198.1
• Meets MIL-DTL-23053/5 Class 2 & 3
• Flame retardant (Does not include transparent)
• Seals and protects cable splices and terminations.

2 to 1 heat shrink tubing variety pack with multiple colors in each size. This pack includes six different diameters ranging from 1/16” to 3/8”. Each piece is 4” in length. This set comes in a hard plastic case perfect for sorting and storing heat shrink. Features:

• Resistant to common fluids and solvents
• UL and CSA listed
• UV resistant
• Meets DEF. STAN 59.97
• Meets UL 224, 125°C and CSA C22.2 No. 198.1
• Meets MIL-DTL-23053/5 Class 2 & 3
• Flame retardant (Does not include transparent)
• Seals and protects cable splices and terminations.

Included Sizes (Diameter):

• 60 pieces - 1/16 in.
• 35 pieces - 3/32 in.
• 25 pieces - 1/8 in.
• 20 pieces - 3/16 in.
• 10 pieces - 1/4 in.
• 10 pieces - 3/8 in.

2 to 1 heat shrink tubing variety pack. This pack includes six different diameters ranging from 1/16” to 1/2”. Each piece is 2.5” in length. This set comes in a hard plastic case perfect for sorting and storing heat shrink. Features:

• Resistant to common fluids and solvents
• UL and CSA listed
• UV resistant
• Meets DEF. STAN 59.97
• Meets UL 224, 125°C and CSA C22.2 No. 198.1
• Meets MIL-DTL-23053/5 Class 2 & 3
• Flame retardant (Does not include transparent)
• Seals and protects cable splices and terminations.

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

• Max collector to emitter voltage = 45 V
• Max collector to base voltage = 45 V
• Max emitter to base voltage = 6.5 V
• Max collector current = 0.2 A (continuous)

A great digital reverb sound that easily replaces a spring reverberation unit. Stereo outputs may be summed for mono operation. Simple interface: input, output, +5V, and ground

The 2N4125 is a general purpose silicon NPN transistor in a TO-92 case. The 2N4125 is primarily intended for general purpose amplification. It is a popular choice for silicon fuzz pedals due to its low hFE specifications. It has also been used in a variety of classic pedals such as the Phase 90.

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.