HardLabs

MR71 ESR METER

7961·MR71_ESR_METER

MR71 ESR METER PCB layout, top view — open source STM32 board by 7961

About the MR71 ESR METER PCB

MR71 ESR METER is an open source STM32 PCB design by 7961, published on GitHub. It is a 4-layer board measuring 90 × 93 mm, with 131 components from 49 distinct parts.

Its main chip is the STM32F303CBTx, from the STM32 family. Other key parts include the TP4056, MT3608, XC6210B332MR, INA128 and TLV9062xD. By type, the board carries 46 capacitors, 44 resistors, 15 diodes, 8 connectors, 7 ICs and 4 transistors.

Main components on the MR71 ESR METER

TP4056MT3608XC6210B332MRSTM32F303CBTxINA128TLV9062xD

MR71 ESR METER bill of materials (BOM)

131 components, 49 distinct parts.

QtyPartRefs
1
TP4056
U1
1
MT3608
U2
1
XC6210B332MR
U3
1
STM32F303CBTx
U4
1
~
U5
1
INA128
U6
1
TLV9062xD
U7
2
2N7002K
Q1, Q3
2
IRLML6402
Q2, Q4
1
Crystal
Y1
1
TYPE_C_16P
J1
1
1.25MM
J2
1
~
J3
1
SWD
J4
4
SMA
J5, J6, J7, J8
1
1a
F1
1
Jumper_2_Open
JP1
1
G6K-2
K1
7
1N4148WS
D1, D2, D3, D6, D7, D9, D16
3
SMAJ26CA
D4, D5, D8
Show 29 more
QtyPartRefs
4
1N5819WS
D10, D11, D12, D13
1
~
D15
2
1k@100M
FB1, FB2
1
10UH
L1
8
10u
C1, C2, C4, C7, C14, C18, C23, C47
19
100n
C3, C5, C6, C9, C11, C12, C15, C19 +11
2
22u
C8, C48
4
4.7u
C10, C27, C39, C50
2
220uf
C13, C17
2
22pf
C20, C21
3
220N
C33, C34, C35
3
1N
C37, C42, C43
2
100P
C40, C41
1
22P
C45
3
5.1K
R1, R2, R3
1
180K
R4
12
10K
R5, R6, R7, R9, R10, R11, R14, R16 +4
1
1k
R8
2
33R
R12, R13
1
13K
R17
1
33R
R19
1
100k
R21
4
3K
R22, R23, R34, R35
3
1M
R24, R25, R26
4
51
R27, R28, R30, R41
6
300
R29, R36, R37, R39, R42, R43
1
3.6K
R31
2
6.2K
R32, R33
2
7.5K
R38, R40

MR71 ESR METER design files

The KiCad project lives in the 7961/MR71_ESR_METER repository on GitHub; these links point at the commit this page was built from.

MR71 ESR METER: common questions

What microcontroller does the MR71 ESR METER use?

The MR71 ESR METER is built around the STM32F303CBTx, from the STM32 family.

How big is the MR71 ESR METER PCB?

The MR71 ESR METER measures 90 × 93 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the MR71 ESR METER?

131 components, from 49 distinct parts. The full bill of materials is listed on this page.

Where can I download the MR71 ESR METER design files?

From the 7961/MR71_ESR_METER repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the MR71 ESR METER design in my own project?

The repository has no license, so all rights stay with 7961. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the MR71 ESR METER without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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