2 layers123.8 × 74.9 mm
2 layers121 × 70.5 mm
Joshua
thepolymatt/joshua12The Repository for "Joshua" the audio/OSD mod for CRT TVs
- Size
- 121 × 70.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 58
- Nets
- 53
- Pads
- 173
- Tracks, vias
- 293, 41
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 Apr 2025
- Updated
- 24 May 2025
Overview
Joshua is an open-source printed circuit board by thepolymatt, from the thepolymatt/joshua repository on GitHub. It is a 2-layer board of 121 × 70.5 mm with 58 parts on 53 nets, routed with 293 tracks and 41 vias.
It is built around the ATMEGA328P-AU, ATTINY85-20SU and TSOP38238, with the ABM3B-12.000MHZ-B2-T and RCJ-011 among its other parts. Its parts include 20 capacitors, 8 resistors, 6 ICs, 5 diodes and 5 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
5
ATMEGA328P-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
ATTINY85-20SU
SOIC-8-208mil-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 512Byte 512Byte 6 8 Bit 8KB AVR Built-in FLASH SOIC-8-208mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
TSOP38238
SIP-3-2.54mm-25℃~+85℃ 10mW 2.5V~5.5V 350uA 38kHz 45m ±45° SIP-3-2.54mm Infrared Remote Receiver (IRM) ROHSVishay IntertechnologyInfrared Remote Receiver (IRM)
ABM3B-12.000MHZ-B2-T
SMD5032-4P-20℃~+70℃ 12MHz 18pF 70Ω Crystal Oscillator ±20ppm ±50ppm SMD5032-4P Crystals ROHSAbraconCrystals
RCJ-011
-- RCA Connector ROHSCUIAudio Connectors (Headphones)
README
README.mdjoshua
The Repository for "Joshua" the audio/OSD mod for CRT TVs
Full readme coming soon!
Parts
58| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7, C9, C12, C13, C19, C20, C21, C22, C24 |
| 3 | , , | ||
| 3 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C10, C23 |
| 3 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R6 |
| 2 | 100uF 25V | 865090449009:CAPAE830X650N | C16, C18 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 2 | 22pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6, C8 |
| 2 | 330 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R7 |
| 2 | Conn_01x02 | Connector_JST:JST_XH_B2B-XH-AM_1x02_P2.50mm_Vertical | J1, J3 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | 0.5A 20V | Diode_SMD:D_SOD-123 | D2 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 1000uF 25V | 865060462010:CAPAE1350X1400N | C17 |
| 1 | 100V, 200mA | Diode_SMD:D_SOD-123 | D6 |
| 1 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10 |
| 1 | 16VWM 26VC | Diode_SMD:D_SMA | D1 |
| 1 | 20V 410mW | Diode_SMD:D_SOD-123 | D3 |
| 1 | 680k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8 |
| 1 | ?uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C14 |
| 1 | ABM3B-12.000MHZ-B2-T | ABM3B-8.000MHZ-B2-T:ABM3B | Y1 |
| 1 | ATMEGA328P-AU | ATMEGA328P-AU:QFP80P900X900X120-32N | U2 |
| 1 | ATtiny85-20S | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U6 |
| 1 | Conn_02x03_Odd_Even | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | ISP |
| 1 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D4 |
| 1 | LM1881MX_NOPB | MCP4131-104E_SN:SOIC127P600X175-8N | U4 |
| 1 | LM386N-4_NOPB | LM386N-4_NOPB:DIP794W53P254L959H508Q8N | U5 |
| 1 | MCP1703AT-5002E/MB | Package_TO_SOT_SMD:SOT-89-3 | U1 |
| 1 | MCP4131-104E_SN | MCP4131-104E_SN:SOIC127P600X175-8N | VR1 |
| 1 | RCJ-011 | RCJ-011:RCJ011 | J6 |
| 1 | TSOP38238 | TSOP38238:TSOP38238 | U3 |
| 1 | Video In | RCJ-011:RCJ011 | J4 |
| 1 | Video Out | RCJ-011:RCJ011 | J5 |
The 52 most common of 58 parts.
Questions
How big is the Joshua PCB?
It measures 121 × 70.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Joshua use?
58 parts, built around the ATMEGA328P-AU, ATTINY85-20SU, TSOP38238 and ABM3B-12.000MHZ-B2-T. 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 Joshua KiCad files?
From the thepolymatt/joshua repository on GitHub, at the commit this page was made from: the board is kicad/joshua/joshua.kicad_pcb and its schematic kicad/joshua/joshua.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Joshua design in my own project?
Its repository states no licence, so its author keeps all rights: ask thepolymatt before reusing the design.
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