HardLabs

Buffer pedal

ciwhitfill·buffer-pedal

Buffer pedal PCB layout, top view — open source board by ciwhitfill
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About the Buffer pedal PCB

Buffer pedal is an open source PCB design by ciwhitfill, published on GitHub. It is a 2-layer board measuring 20.9 × 21.2 mm, with 12 components from 8 distinct parts.

By type, the board carries 6 resistors, 3 capacitors, 2 transistors and 1 diode.

It belongs with the audio designs in this gallery.

From the project

Design and documentation for guitar buffer pedal

This project documents the design and construction of a JFET buffer guitar pedal.

The circuit consists of a JFET source follower with an active load. Compared to passive biasing, an active load provides an operating point that is stable over a much larger range of voltages. This allows the amplifier to drive lower impedance loads at lower supply voltages.

When a 1 V, 1 kHz test signal is applied to the input, the buffer reproduces it at the output within the precision of the test equipment available.

Buffer pedal, from the project README
From the project README

Buffer pedal bill of materials (BOM)

12 components, 8 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
J113
Q1, Q2
1
1N4003
D1
2
10u
C1, C2
1
47u
C3
3
10M
R1, R2, R3
1
330
R5
1
100k
R6
1
4.7k
R7

Buffer pedal design files

The KiCad project lives in the ciwhitfill/buffer-pedal repository on GitHub; these links point at the commit this page was built from.

Buffer pedal: common questions

How big is the Buffer pedal PCB?

The Buffer pedal measures 20.9 × 21.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Buffer pedal?

12 components, from 8 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Buffer pedal design files?

From the ciwhitfill/buffer-pedal repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Buffer pedal design in my own project?

The repository has no license, so all rights stay with ciwhitfill. Use it as a reference, and ask the author before reusing the design.

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