Speech
About the Speech PCB
Speech is an open source PCB design by dimitrit, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 57 × 39 mm, with 19 components from 12 distinct parts.
Other key parts include the SP0256AL2 and LM386. By type, the board carries 9 capacitors, 4 resistors, 2 ICs, 2 connectors and 1 crystal.
It belongs with the retro computing designs in this gallery.
From the project
A range of gadgets that can be plugged in to the PAL-1 RIOT Expansion Module to provide specific functionality.
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:
a Real-Time Clock a Speech Processor an Analog-to-Digital Converter an IEC interface
Main components on the Speech
Speech bill of materials (BOM)
19 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SP0256AL2 | DIP-28_W15.24mm | U1 |
| 1 | LM386 | DIP-8_W7.62mm | U2 |
| 1 | 3.12Mhz | Crystal_HC49-U_Vertical | Y1 |
| 1 | Conn_RIOT | PinHeader_2x09_P2.54mm_Vertical | J1 |
| 1 | AudioJack3_Ground | Jack_3.5mm_4Pole_TRRS | J2 |
| 1 | 10K | Potentiometer_Runtron_RM065_Vertical | RV1 |
| 4 | 0.1uF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C5, C8 |
| 2 | 22pF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C3, C4 |
| 2 | 10uF | CP_Radial_D5.0mm_P2.50mm | C6, C7 |
| 1 | 220uF | CP_Radial_D5.0mm_P2.50mm | C9 |
| 1 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 3 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R4 |
Speech design files
The KiCad project lives in the dimitrit/pal1gadgets repository on GitHub; these links point at the commit this page was built from.
- Layoutspeech/kicad/speech.kicad_pcb
- Schematicspeech/kicad/speech.kicad_sch
Speech: common questions
How big is the Speech PCB?
The Speech measures 57 × 39 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Speech?
19 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the Speech design files?
From the dimitrit/pal1gadgets repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Speech design in my own project?
Yes, under the terms of its GPL-3.0 license, which dimitrit chose for the repository.
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