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Spectrum-Audio-Amp

anasarif23·Spectrum-Audio-Amp

Spectrum-Audio-Amp PCB layout, top view — open source NXP board by anasarif23

About the Spectrum-Audio-Amp PCB

Spectrum-Audio-Amp is an open source NXP PCB design by anasarif23, published on GitHub. It is a 4-layer board measuring 178.8 × 171 mm, with 242 components from 59 distinct parts.

Its main chip is the Teensy4.1, from the NXP family. Other key parts include the NE5532, LM317_TO-220, LM337_TO220, LM2596S-5 and LMC835N. By type, the board carries 110 capacitors, 96 resistors, 11 ICs, 9 diodes, 7 switches and 5 connectors.

It belongs with the audio, test & measurement and displays & leds designs in this gallery.

From the project

Stereo audio preamp with EQ, spectrum display, and class-D power amplifier — designed in KiCad.

The first version of the schematic, completed while learning KiCad fundamentals. This version has some design mistakes that I identified during review, including [add specifics if you can — e.g. incorrect regulator pinout, missing decoupling capacitors, etc.]. I used Claude as a learning resource throughout this stage to understand regulator behavior, KiCad's schematic tools, and best practices for power supply design.

Main components on the Spectrum-Audio-Amp

NE5532LM317_TO-220LM337_TO220LM2596S-5LMC835NMSGEQ7Teensy4.1SN74AHCT125NPAM8403D

Spectrum-Audio-Amp bill of materials (BOM)

242 components, 59 distinct parts.

QtyPartRefs
3
NE5532
U1, U6, U13
1
LM317_TO-220
U2
1
LM337_TO220
U3
1
LM2596S-5
U4
1
LMC835N
U5
1
MSGEQ7
U14
1
Teensy4.1
U15
1
SN74AHCT125N
U16
1
PAM8403D
U18
1
SJ-3523-SMT
J1
1
Barrel_Jack
J2
2
Screw_Terminal_01x02
J3, J4
1
Conn_01x06_Pin
J6
1
DCWN03A-12
PS1
1
10k
RV1
7
RotaryEncoder
SW1, SW2, SW3, SW4, SW5, SW6, SW7
1
1N5822
D1
8
LED
D2, D3, D4, D5, D6, D7, D8, D9
1
FerriteBead
FB1
1
33uH
L1
Show 39 more
QtyPartRefs
2
2.2uF
C1, C2
11
1uF
C3, C6, C16, C17, C51, C54, C88, C89 +3
7
0.1uF
C4, C5, C15, C18, C63, C64, C91
1
220uF
C7
22
100nF
C8, C10, C11, C14, C43, C46, C48, C50 +14
1
220uF
C9
22
10uF
C12, C13, C44, C45, C47, C49, C52, C55 +14
3
0.47uF
C19, C94, C107
2
0.033uF
C20, C22
1
0.47uF
C21
2
0.15uF
C23, C25
2
0.015uF
C24, C26
2
0.068uF
C27, C29
2
0.0068uF
C28, C30
2
0.022uF
C31, C33
2
0.0033uF
C32, C34
2
0.01uF
C35, C37
2
0.0015uF
C36, C38
2
0.0047uF
C39, C41
4
680pF
C40, C42, C53, C75
1
33pF
C85
14
10nF
C92, C93, C95, C96, C97, C98, C99, C100 +6
1
470uF
C108
5
47k
R1, R2, R3, R50, R53
2
22k
R4, R10
4
100
R5, R6, R57, R62
2
1.8k
R7, R8
2
240
R9, R13
2
1.2k
R11, R12
26
100k
R14, R16, R17, R18, R20, R21, R23, R24 +18
14
680
R15, R19, R22, R25, R28, R31, R34, R37 +6
4
82k
R32, R35, R38, R41
2
62k
R44, R47
4
470
R58, R60, R63, R66
2
6.8k
R59, R65
1
200k
R69
20
10k
R70, R71, R72, R73, R75, R76, R78, R79 +12
1
2.2k
R77
5
1.5k
R90, R91, R92, R93, R94

Spectrum-Audio-Amp design files

The KiCad project lives in the anasarif23/Spectrum-Audio-Amp repository on GitHub; these links point at the commit this page was built from.

Spectrum-Audio-Amp: common questions

What microcontroller does the Spectrum-Audio-Amp use?

The Spectrum-Audio-Amp is built around the Teensy4.1, from the NXP family.

How big is the Spectrum-Audio-Amp PCB?

The Spectrum-Audio-Amp measures 178.8 × 171 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Spectrum-Audio-Amp?

242 components, from 59 distinct parts. The full bill of materials is listed on this page.

Where can I download the Spectrum-Audio-Amp design files?

From the anasarif23/Spectrum-Audio-Amp repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Spectrum-Audio-Amp design in my own project?

The repository has no license, so all rights stay with anasarif23. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Spectrum-Audio-Amp without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.

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