HardLabs

Preamp Board

colektamu·ECEN404-2026SP-TIAmplifier·Cole - Pre and power Amp/aio_pcb_small/aio_pcb/aio_pcb_small/aio_pcb_small.kicad_pcb

Preamp Board layout, top view — open source ESP32 board by colektamu
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About the Preamp Board

Preamp Board is an open source ESP32 PCB design by colektamu, published on GitHub. It is a 2-layer board measuring 154.4 × 73.8 mm, with 86 components from 42 distinct parts.

Its main chip is the ESP32-C6-WROOM-1-N4, from the ESP32 family. Other key parts include the OPA1656ID. By type, the board carries 36 capacitors, 28 resistors, 7 connectors, 4 ICs, 2 switches and 2 inductors.

From the project

Files from 403 and 404

Main components on the Preamp Board

OPA1656IDESP32-C6-WROOM-1-N4

Preamp Board bill of materials (BOM)

86 components, 42 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
OPA1656ID
U1, U2
1
OPA1656ID
U3
1
ESP32-C6-WROOM-1-N4
U6
1
AUDIOJACK3_GROUND
SJ1-3523N
J1
1
CONN_01X02
Conn_01x15
J2
3
691210910002
J4, J5V1, J33V1
1
Conn_01x08
J5
1
694108301002
J7
1
691210910002
JAUDIO1
2
TS02-66-43-BK-100-LCR-D
S1, S2
4
MCP41HV51-103E/ST
UBass1, UMid1, UTreb1, UVol1
2
TPS561201DDCR
U_5V2, U_33
1
4.7uH
L1
1
3.3uH
L2
2
2.2μF
C1, C13
1
100NF
100nF
C2
1
2.2NF
2.2nF
C3
1
22PF
22pF
C4
8
10μF
C5, C7, C10, C14, C17, C19, C21, C37
8
0.1μF
C6, C8, C9, C15, C18, C20, C22, C38
Show 22 more
QtyPartRefs
1
15NF
15nF
C11
1
22NF
22nF
C12
1
1uF
C16
5
47uF
C23, C24, C28, C29, C33
4
10uF
C25, C26, C30, C31
2
100nF
C27, C32
1
0.1u
C34
2
100K
100k
R1, R2
2
5k
R3, R7
2
2.8K
2.8k
R4, R8
1
22K
22k
R5
1
4.7K
4.7k
R6
4
47K
47k
R9, R10, R12, R14
2
3.6K
3.6k
R11, R13
1
15K
10k
R15
2
10K
2.2k
R16, R17
1
10K
10k
R18
5
10k
R19, R24, R25, R26, R27
1
56.2k
R20
2
10k
R21, R23
1
33.2k
R22
1
100
R28

Preamp Board design files

The KiCad project lives in the colektamu/ECEN404-2026SP-TIAmplifier repository on GitHub; these links point at the commit this page was built from.

Preamp Board: common questions

What microcontroller does the Preamp Board use?

The Preamp Board is built around the ESP32-C6-WROOM-1-N4, from the ESP32 family.

How big is the Preamp Board?

The Preamp Board measures 154.4 × 73.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Preamp Board?

86 components, from 42 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 Preamp Board design files?

From the colektamu/ECEN404-2026SP-TIAmplifier repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Preamp Board design in my own project?

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

Can I test firmware for the Preamp Board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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