2 layers43.2 × 54.6 mm Pt papa, the printed circuit board in 3D

Pt papa

A budget friendly LTC/TimeCode device built from a RaspberryPi Pico - using the PIO blocks and MicroPython

Size: 43.2 × 54.6 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 32
Nets: 48
Pads: 200
Tracks, vias: 204, 0
Pours: 1
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 4 May 2023
Updated: 13 Oct 2026

Overview

Pt papa is an open-source printed circuit board by mungewell, from the mungewell/pico-timecode repository on GitHub, published under the MIT licence. It is a 2-layer board of 43.2 × 54.6 mm with 32 parts on 48 nets, routed with 204 tracks and 0 vias.

It is built around the LM358, MCP6S91-E/SN and SJ-43514-SMT-TR, with the LTST-S220GKT among its other parts. Its parts include 13 resistors, 7 connectors, 4 capacitors, 3 ICs and 1 diode. It belongs with the RP2040 boards of this library.

Main components

README

hardware/pt-papa/readme.md

Work is starting on PCB Rev2, for a while these files may be incomplete. You can access the Rev1 PCB here:

https://github.com/mungewell/pico-timecode/releases/tag/PCB_Rev1

Ideas for future:

2x button on the bottom side, for replicating A & B when used with RP2040-LCD-0.96
pull down 0R on U2/5 nCS, to allow 3rd party to wire line if SD0 is also used for other devices.
add battery holder connections/through holes
connections for Digi-Slate (extra) 8x 7-seg LED.

This lib looks very interesting: https://github.com/smittytone/HT16K33-Python

display count when switch is open, then hold for 2s once closed, then turn off possibly display UB, though could only do Digits/BCD.

would need I2C (GP0, 1) and GPIO (GP2), plus GND/3.3v/VSYS

Parts

Qty	Value	Footprint	References
5	0R	Resistor_SMD:R_0603_1608Metric	R7, R9, R11, R12, R13
5	10K	Resistor_SMD:R_0603_1608Metric	R1, R2, R3, R4, R6
4	10uF	Capacitor_SMD:C_0805_2012Metric	C1, C2, C3, C4
4	MountingHole	MountingHole:MountingHole_3mm	H1, H2, H3, H4
2	150K	Resistor_SMD:R_0603_1608Metric	R5, R10
2	Conn_01x08	Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical	J11, J14
2	Conn_01x12	Connector_PinSocket_2.54mm:PinSocket_1x12_P2.54mm_Vertical	J12, J13
2	SJ-43514-SMT-TR	SJ-43514-SMT:CUI_SJ-43514-SMT-TR	J1, J2
1	330R	Resistor_SMD:R_0603_1608Metric	R8
1	Conn_01x02	Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical	J3
1	LM358	Package_SO:SO-8_5.3x6.2mm_P1.27mm	U1
1	LTST-S220GKT	footprints:LED_LTST-S220GKT_LTO	LED1
1	MCP6S91-E/SN	MCP6S91_E_SN:SOIC8-N_MC_MCH	U2
1	Pico	RP-Pico-Main:RPi_Pico_SMD_TH	U10

Questions

How big is the Pt papa PCB?

It measures 43.2 × 54.6 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Pt papa use?

32 parts, built around the LM358, MCP6S91-E/SN, SJ-43514-SMT-TR and LTST-S220GKT. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Pt papa KiCad files?

From the mungewell/pico-timecode repository on GitHub, at the commit this page was made from: the board is hardware/pt-papa/pt.kicad_pcb and its schematic hardware/pt-papa/pt.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Pt papa design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

RP2040

Topics

ltc micropython micropython-rpi-pico raspberry-pi-pico timecode

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/mungewell-pico-timecode-pt" title="Pt papa in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/mungewell-pico-timecode-pt.jpg" alt="Pt papa" width="1200" height="900">

A picture that opens the board, for a README

[![Pt papa](https://pcbkit.io/embed/boards/mungewell-pico-timecode-pt.jpg?size=s)](https://pcbkit.io/boards/mungewell-pico-timecode-pt)

Source

Repository: mungewell/pico-timecode
Board file: hardware/pt-papa/pt.kicad_pcb
Commit: 2e00f17
Homepage: github.com/mungewell/pico-timecode
Licence: MIT

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