Zx talkman
About the Zx talkman PCB
Zx talkman is an open source PCB design by zxinfo-diy-electronics, published on GitHub. It is a 2-layer board measuring 75.9 × 66 mm, with 33 components from 25 distinct parts.
Other key parts include the SP0256-AL2, 74LS27, LM386 and 74LS126. By type, the board carries 15 capacitors, 8 resistors, 4 ICs, 2 transistors, 2 connectors and 1 crystal.
It belongs with the test & measurement and retro computing designs in this gallery.
From the project
DIY Speech Interface for ZX Spectrum & ZX81 published in Ny Elektronik 1984 issue 10 page 36
Short demo of ZX Spectrum saying 'Hello World' using the interface.
- Disbale the amplifier when the SP0256 is inactive, to reduce output noise. - Make output SBY & LRQ line readable from computer for better control and compability with other interfaces. - Jumper to enable/disable control of WAIT line
Main components on the Zx talkman
Zx talkman bill of materials (BOM)
33 components, 25 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SP0256-AL2 | DIP-28_W15.24mm_Socket | U1 |
| 1 | 74LS27 | DIP-14_W7.62mm | U2 |
| 1 | LM386 | DIP-8_W7.62mm | U3 |
| 1 | 74LS126 | DIP-14_W7.62mm | U4 |
| 1 | BC548 | TO-92_Inline | Q1 |
| 1 | BC557 | TO-92_Inline | Q2 |
| 1 | 3.12Mhz | Crystal_HC49-U_Vertical | Y1 |
| 1 | ZX_Spectrum_Connector_48K | EDGE_ZX_SPECTRUM | J1 |
| 1 | WAIT | PinHeader_1x02_P2.54mm_Horizontal | J2 |
| 1 | HT | PinHeader_1x02_P2.54mm_Horizontal | HT1 |
| 2 | 22pF ceramic | C_Rect_L7.0mm_W2.5mm_P5.00mm | C1, C2 |
| 5 | 100nF MKT | C_Rect_L7.0mm_W2.5mm_P5.00mm | C3, C4, C9, C10, C15 |
| 2 | 4,7uF tantalum | CP_Radial_Tantal_D4.5mm_P5.00mm | C5, C7 |
| 1 | 470pF ceramic | C_Disc_D4.3mm_W1.9mm_P5.00mm | C6 |
| 1 | 10uF electrolytic | CP_Radial_D5.0mm_P2.50mm | C8 |
| 2 | 100uF electrolytic | CP_Radial_D5.0mm_P2.50mm | C11, C12 |
| 2 | 100nF ceramic | C_Disc_D3.0mm_W1.6mm_P2.50mm | C14, C16 |
| 1 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 33K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
Show 5 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 4,7K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 10K, log | PinHeader_1x03_P2.54mm_Horizontal | R8 |
| 1 | 10 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10 |
Zx talkman design files
The KiCad project lives in the zxinfo-diy-electronics/zx-talkman repository on GitHub; these links point at the commit this page was built from.
- Layoutzx-talker.kicad_pcb
- Schematiczx-talker.kicad_sch
Zx talkman: common questions
How big is the Zx talkman PCB?
The Zx talkman measures 75.9 × 66 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Zx talkman?
33 components, from 25 distinct parts. The full bill of materials is listed on this page.
Where can I download the Zx talkman design files?
From the zxinfo-diy-electronics/zx-talkman repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Zx talkman design in my own project?
The repository has no license, so all rights stay with zxinfo-diy-electronics. Use it as a reference, and ask the author before reusing the design.
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