HardLabs

Telegraph

Kreyl·Telegraph·pcb/Telegraph.kicad_pcb

Telegraph PCB layout, top view — open source STM32 board by Kreyl

About the Telegraph PCB

Telegraph is an open source STM32 PCB design by Kreyl, published on GitHub. It is a 2-layer board measuring 87 × 88 mm, with 176 components from 58 distinct parts.

Its main chip is the STM32F405RX-64, from the STM32 family. Other key parts include the L6470. By type, the board carries 53 resistors, 48 capacitors, 14 test points, 13 diodes, 8 transistors and 5 switches.

Main components on the Telegraph

L6470

Telegraph bill of materials (BOM)

176 components, 58 distinct parts.

QtyPartRefs
2
L6470
U1, U2
6
BC848
Q1, Q2, Q6, Q7, Q10, Q11
1
DVIUC6-4SC6
Q5
1
MMBT2222
Q14
1
BUZZER
BZ1
1
LP2951
DA1
1
IPS6041
DA2
1
STM32F405RX-64
DD1
9
HOLE_METALLED
HOLE1, HOLE2, HOLE3, HOLE4, HOLE5, HOLE6, HOLE8, HOLE9 +1
1
DIPx4
SW1
1
SWITCH_H
SW2
1
BUTTON
SW3
2
SWITCH_2x
SW4, SW5
14
TESTPOINT
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +6
2
2.2u
VCap1, VCap2
2
CONN_2
XL1, XL2
1
CONN_3
XL5
1
ST_SWD
XL6
1
USB_MICRO_B
XL7
1
BARREL_SOCKET
XL8
Show 38 more
QtyPartRefs
2
CONN_2
XL9, XL16
5
CONN_2
XL10, XL11, XL12, XL13, XL14
1
CONN_5
XL15
2
CONN_4
XL17, XL18
1
12 MHz
XTAL1
2
SMBJ15CA
D1, D2
2
SS14
D13, D14
5
LED
D18, D19, D20, D21, D22
4
1N4148
D23, D24, D25, D26
1
BLM
L1
4
10n
C1, C2, C3, C4
4
10u
C7, C21, C32, C34
13
0.1u
C8, C9, C11, C12, C14, C15, C16, C20 +5
2
20pF
C10, C13
1
1000u
C17
1
1000pF
C18
1
1u
C19
5
100p
C22, C23, C24, C25, C30
2
4u7/63v
C33, C35
2
220n/16v
C36, C38
2
10n/50v
C37, C39
8
0.1u/50v
C40, C41, C42, C43, C44, C45, C46, C47
2
100u/63v
C48, C49
1
4u7
C50
4
4k7
R1, R6, R69, R71
7
200
R3, R4, R7, R47, R48, R49, R72
11
1k
R9, R10, R13, R14, R18, R19, R50, R53 +3
1
1M
R17
10
10k
R22, R23, R26, R28, R34, R35, R42, R43 +2
2
150
R27, R29
3
20k
R38, R39, R51
1
200R
R46
1
12k
R52
4
510R
R56, R57, R58, R59
5
39K
R60, R61, R62, R63, R64
2
33k
R68, R70
1
330k
R74
1
100k
R75

Telegraph design files

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

Telegraph: common questions

What microcontroller does the Telegraph use?

The Telegraph is built around the STM32F405RX-64, from the STM32 family.

How big is the Telegraph PCB?

The Telegraph measures 87 × 88 mm, has 2 copper layers and is 1.5 mm thick.

How many components are on the Telegraph?

176 components, from 58 distinct parts. The full bill of materials is listed on this page.

Where can I download the Telegraph design files?

From the Kreyl/Telegraph repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Telegraph design in my own project?

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

Can I test firmware for the Telegraph 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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