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STM32-Based Speaker Protection Controller

stamatis-mavitzis·Power-Amplifier·KiCad/Protection Controller/STM32 Speaker Protection Controller.kicad_pcb

STM32-Based Speaker Protection Controller PCB layout, top view — open source board by stamatis-mavitzis

About the STM32-Based Speaker Protection Controller PCB

STM32-Based Speaker Protection Controller is an open source PCB design by stamatis-mavitzis, published on GitHub. It is a 2-layer board measuring 121 × 182.3 mm, with 59 components from 31 distinct parts.

Other key parts include the LM7812 and NUCLEO-G031K8. By type, the board carries 21 resistors, 8 capacitors, 6 connectors, 6 diodes, 5 LEDs and 2 ICs.

It belongs with the audio and power & battery designs in this gallery.

From the project

DIY Hi-Fi Power Amplifier designed in KiCad, featuring a discrete Class-AB amplifier stage, dedicated power supply, STM32-based speaker protection, thermal monitoring, DC fault detection, and custom PCB designs.

KiCad · Discrete Class‑AB · ±32 V Rails · STM32G031K8 · Speaker Protection · Thermal Monitoring

This repository contains the engineering design of a two-channel discrete Hi‑Fi Class‑AB power amplifier developed in KiCad.

The power-amplifier stage is based on the design principles of Rod Elliott's ESP Project 3A, while this implementation expands the reference design into a complete stereo system with custom PCB layouts, a dual-transformer power architecture, updated production components, thermal management, and a dedicated STM32-based speaker protection controller.

Main components on the STM32-Based Speaker Protection Controller

LM7812NUCLEO-G031K8

STM32-Based Speaker Protection Controller bill of materials (BOM)

59 components, 31 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LM7812
U1
1
NUCLEO-G031K8
U2
2
BC337
Q1, Q2
1
AC1
J1
1
AC2
J3
1
AMP_OUT_L
J5
1
AMP_OUT_R
J6
1
SPEAKER_OUT_L
J8
1
SPEAKER_OUT_R
J10
1
1.5A
BR1
1
250 mA
F1
2
G2RL-1A-E DC12
K1, K2
1
MUTE / ENABLE
SW1
1
FAULT RESET
SW2
1
FS24-250-C2
T1
2
10K NTC
TH1, TH2
1
TEMP SENSOR 2 FAIL
LED1
1
TEMP SENSOR 1 FAIL
LED2
1
DC FAULT
LED3
1
WAIT / DELAY
LED4
Show 11 more
QtyPartRefs
1
OVERHEAT LED
LED5
4
BAT85
D2, D3, D4, D5
2
1N4007
D6, D7
1
2200u
C1
4
100n
C2, C3, C6, C8
1
100u
C4
2
4.7u
C5, C7
2
150K
R1, R5
10
10K
R2, R3, R6, R7, R9, R10, R11, R12 +2
4
4.7K
R4, R8, R15, R16
5
470
R17, R18, R19, R20, R21

STM32-Based Speaker Protection Controller design files

The KiCad project lives in the stamatis-mavitzis/Power-Amplifier repository on GitHub; these links point at the commit this page was built from.

STM32-Based Speaker Protection Controller: common questions

How big is the STM32-Based Speaker Protection Controller PCB?

The STM32-Based Speaker Protection Controller measures 121 × 182.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the STM32-Based Speaker Protection Controller?

59 components, from 31 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 STM32-Based Speaker Protection Controller design files?

From the stamatis-mavitzis/Power-Amplifier 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 STM32-Based Speaker Protection Controller design in my own project?

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

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