2 layers62.5 × 34 mm
Rtc
dimitrit/pal1gadgets
A range of gadgets that can be plugged in to the PAL-1 RIOT Expansion Module to provide specific functionality.
11 parts2GPL-3.0
2 layers57 × 39 mm
Speech
dimitrit/pal1gadgets2A range of gadgets that can be plugged in to the PAL-1 RIOT Expansion Module to provide specific functionality.
- Size
- 57 × 39 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 39
- Pads
- 91
- Tracks, vias
- 226, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 10 Mar 2024
- Updated
- 25 Oct 2025
Overview
Speech is an open-source printed circuit board by dimitrit, from the dimitrit/pal1gadgets repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 57 × 39 mm with 20 parts on 39 nets, routed with 226 tracks and 0 vias.
It is built around the LM386. Its parts include 9 capacitors, 4 resistors, 2 ICs, 2 connectors and 1 crystal. It belongs with the retro computing and games boards of this library.
Main components
1README
README.mdPAL1-GADGETS: A range of Gadgets for the PAL-1
The PAL-1 RIOT Expansion Module adds two bidirectional 8-bit digital input/output ports and a programmable interval timer to the PAL-1 system by means of a MOS6532 RAM-I/O-Timer (RIOT) IC.1
This repository includes a number of `gadgets' that can be plugged in to the RIOT Expansion Module to provide specific functionality, including:
Refer to the relevant directories for details on each gadget.
Gadgets are plugged in to the PAL-1 RIOT Expansion Module using a RIOT adapter.
Example code
Code examples are provided for most gadgets. These code examples use vasm6502_oldstyle syntax2 and can be built using make.3
Acknowledgements
PAL-1 and the PAL-1 logo used with kind permission by Liu Ganning.
Footnotes
-
Ganning, Liu, ‘RIOT EXPANSION’, 2021 http://pal.aibs.ws/assets/RIOT_expansion_manual.pdf [accessed 26 January 2024]. ↩
-
Barthelmann, Volker and Wille, Frank, `vasm assembler system' (2024), http://sun.hasenbraten.de/vasm/daily/vasm.tar.gz [accessed 27 March 2024]. ↩
-
Free Software Foundation, `Make - GNU Project', <https://www.gnu.org/ software/make/> [accessed 27 March 2024]. ↩
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 0.1uF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C5, C8 |
| 3 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R4 |
| 2 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C6, C7 |
| 2 | 22pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C3, C4 |
| 1 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 10K | Custom:Potentiometer_Runtron_RM065_Vertical | RV1 |
| 1 | 220uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C9 |
| 1 | 3.12Mhz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | AudioJack3_Ground | Custom:Jack_3.5mm_4Pole_TRRS | J2 |
| 1 | Conn_RIOT | Connector_PinHeader_2.54mm:PinHeader_2x09_P2.54mm_Vertical | J1 |
| 1 | LM386 | Package_DIP:DIP-8_W7.62mm | U2 |
| 1 | LOGO | LOGO | G*** |
| 1 | SP0256AL2 | Package_DIP:DIP-28_W15.24mm | U1 |
More from dimitrit/pal1gadgets
6- 2 layers81 × 36 mm
Adc
dimitrit/pal1gadgets
A range of gadgets that can be plugged in to the PAL-1 RIOT Expansion Module to provide specific functionality.
7 parts2GPL-3.0 - 2 layers48.1 × 34 mm
Iec
dimitrit/pal1gadgets
A range of gadgets that can be plugged in to the PAL-1 RIOT Expansion Module to provide specific functionality.
7 parts2GPL-3.0 - 2 layers28 × 38.5 mm
Pal1gadgets
dimitrit/pal1gadgets
A range of gadgets that can be plugged in to the PAL-1 RIOT Expansion Module to provide specific functionality.
4 parts2GPL-3.0 - 2 layers26.9 × 39 mm
Snes adapter
dimitrit/pal1gadgets
A range of gadgets that can be plugged in to the PAL-1 RIOT Expansion Module to provide specific functionality.
3 parts2GPL-3.0 - 2 layers17 × 34 mm
Adapter
dimitrit/pal1gadgets
A range of gadgets that can be plugged in to the PAL-1 RIOT Expansion Module to provide specific functionality.
2 parts2GPL-3.0
Similar boards
- 2 layers152 × 88 mm
RFBitBangSMT
profdc9/RFBitBanger
A QRP digital transceiver created from readily available parts for off-the-grid maintenance
271 parts222 - 2 layers90 × 140 mm
Drumkid
mattybrad/drumkid
Version 4 was the first successful working design, with full code, schematics, Gerbers, etc available on GitHub.
70 parts137 - 2 layers
LM80C R6
leomil72/LM80C
A Z80-based homebrew computer withTMS9918, AY-3-8910, Z80 CTC, Z80 PIO, and Z80 SIO
153 parts123GPL-3.0 - 2 layers145.3 × 44.5 mm
- 2 layers184 × 114.8 mm
Poly555
oskitone/poly555
The POLY555 is a polyphonic, analog, square wave synth based on the 555 timer chip.
262 parts93 - 4 layers223.3 × 120.1 mm
ISA FPGA v2
robfinch/Cores
Cores ===== RTF's Cores Use at your own risk. Welcome to my galaxy of cores. Contained in the directories are IP cores, source code for digital circuits.
132 parts78 - 2 layers101.6 × 137.4 mm
- 2 layers104.1 × 73.7 mm
Questions
How big is the Speech PCB?
It measures 57 × 39 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Speech use?
20 parts, built around the LM386. 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 Speech KiCad files?
From the dimitrit/pal1gadgets repository on GitHub, at the commit this page was made from: the board is speech/kicad/speech.kicad_pcb and its schematic adapter/kicad/adapter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Speech design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).