PAPRa Printed Circuit Board Assembly

The printed circuit board assembly (thru hole version) for the Tetra PAPRa M12 controller

Quick Synopsis

The following is the board diagram for the M12 controller PCB. Further information can be found in the PAPRA-PCB project.

WARNING:we provide no warranty, implicit or explicit, that this device will work up to an N95 specification, when built outside of a facility rated to do so. The only way to truly test one of these devices using something like a Portacount under controlled conditions.

Enter at your own risk.

Bill of Materials

Table 1. Parts needed for the PCBa
SL NoPartGeneric nameSchematic ReferenceQty

01

PCBa House

PCBa Jig

1

02

Kingbright WP710A10SURCK

RED 5v LED

D1 D3 D4 D5 D7

5

03

Yageo MFR-25FRF52-100R

100R resistor

R2 R7 R8 R9

4

04

Yageo MFR-25FRF52-680R

680R resistor

R10

1

05

Yageo MFR-25FRF52-330K

330K Resistor

R4 R5 R11

3

06

onsemi 1N5237B

Zener Diode

D2

1

07

Comchip 1N4004B-G

1N4004B Diode

D6

1

08

TDK FG14X7R1H334KNT06

Ceramic Capacitor 0.33uF

C1

1

09

TDK FG14X7R2A104KNT06

Ceramic Capacitor 0.1 uF

C3

1

10

Yageo MFR-25FRF52-100K

100K Resistor

R1 R3

2

11

Seeed Studio 113991054

Pin Headers and ESP32

U2

2

12

Texas Instruments UA78L05ACLPME3

Voltage regulator

REG

1

13

Panasonic ECA-1CM221

Electrolytic Capacitor

C2

1

14

TE Connectivity / AMP 63952-1

Battery pins

BATT+ BATT-

2

15

CUI Devices PJ-066A

DC connector

H1

1

16

CUI Devices CMI-1210-92T

Buzzer

SG1

1

17

Wurth Elektronik 696108003002

fuse holder

F1

1

18

BI Technologies P091S-FC20BR10K

10K POT

POT1

1

19

TE Connectivity 5227161-9

BNC Connector

H2

1

20

Diodes Inc. DMT6009LCT

MOSFET

Q2 Q3

2

21

Littelfuse 0617005.MXP

Fuse

F1-Holder

1

22

Infineon IRF9Z24NPBF

Q1

1

23

Yageo MFR-25FRF52-100K

R1 R3

2

24

Diodes Inc. DMT6009LCT

MOSFET

Q2 Q3

2

25

Yageo MFR-25-T-52-0R

R6 R12

2

26

Samtec TSW-107-06-T-S

Q1U2-Headers

2

27

TE Connectivity 1-329632-2

For the BNC Connector (H2)

1

28

TE Connectivity 1-329631-2

For the BNC Connector (H2)

1

29

Amphenol RF 112517

1

Table 2. 3D Printed Tools
PartQuantityMaterialSupports required?STL File Location

Tetra-PCB-jig-v3

1

PETG

No

PCB Jig

Build instructions

  • Download the PCB Jig STL from Github and print it.

420

The larger gaps are to aid the positioning of the battery terminals.

  • Place the board on the PCB Jig. The markings should be upside down.

  • Insert the LEDs with the Anode facing away from the test points.

  • Insert the LEDS in the D1, D3, D4, D5 and D7

420

  • Flip the Board carefully and align the LEDs with the holes in the jig Push them into place until they touch the work surface.

420

Solder them carefully in place.

420

Snip the excess to make the bridging links

420

Bend the wire using the Bending slots in the left side of the Jig.

420

Solder the R6 and R12 with the wire.

420

Place the 100R Resistor in the R2 and solder it.

420

Place the 100R Resistors in the R7, R8, R9 and solder them.

100r resistors M

Place the 680R resistor in the R10 and solder it.

Screenshot%20from%202024 03 22%2023 19 44 M

Place 100K Resistor in the R3 and solder it.

Screenshot%20from%202024 03 22%2023 21 21 M

Place the 330K Resistor and solder it.

Screenshot%20from%202024 03 22%2023 22 43 M

Place the 330K Resistor in R5 and solder it.

Screenshot%20from%202024 03 23%2008 01 18 M

Place the 330K Resistor in R11 and solder it.

Screenshot%20from%202024 03 23%2008 03 08 M

Place Zener Diode in place in D2 and solder it.

Screenshot%20from%202024 03 23%2008 08 30 M

Place the 1N4004B Diode in D6 and solder it.

Screenshot%20from%202024 03 23%2008 09 41 M

Place the Ceramic Capacitor 0.33uF in C1 and solder it.

Screenshot%20from%202024 03 23%2008 12 09 M

Place the Ceramic Capacitor 0.1 uF in the C3 and solder it.

Screenshot%20from%202024 03 23%2008 14 04 M

Place 100K resistor in the R1 and solder it.

Screenshot%20from%202024 03 23%2008 15 47 M

Place the Pin Headers and ESP32 in the U1 and solder it.

Screenshot%20from%202024 03 23%2008 17 04 M

Make sure none of the pads are bridged.

Screenshot%20from%202024 03 23%2008 18 41 M

Place Voltage regulator in REG and solder it.

Screenshot%20from%202024 03 23%2008 20 13 M

Place the Electrolytic Capacitor AMP 63952-1 in the C2.

Screenshot%20from%202024 03 23%2008 22 05 M

Place the battery terminals in the larger gaps.

Screenshot%20from%202024 03 23%2008 25 43 M

Solder the terminals carefully.

Screenshot%20from%202024 03 23%2008 27 11 M

Place the DC connector in the H1 and solder it.

Screenshot%20from%202024 03 23%2008 29 44 M

Place the Buzzer in the SG1 and solder it.

Screenshot%20from%202024 03 23%2008 30 43 M

Place the fuse holder and solder it.

Screenshot%20from%202024 03 23%2008 32 34 M

Place the 10K POT and solder it.

Screenshot%20from%202024 03 23%2008 34 25 M

Place the BNC Connector in the H2 and solder it.

Screenshot%20from%202024 03 23%2008 36 16 M

Place the MOSFET in Q1, Q2 and Q3 and solder them.

Screenshot%20from%202024 03 23%2008 41 16 M

Place the Fuse in the fuse holder.

Screenshot%20from%202024 03 23%2008 42 17 M

Flashing firmware

Instructions for flashing firmware can be found here: https://github.com/tetrabiodistributed/papra-pcba-firmware


Last modified July 19, 2024: Edited warning in PAPRa PCB text in index (04f112a)