Melodik2
About the Melodik2 PCB
Melodik2 is an open source PCB design by z00m128, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 78.1 × 85.1 mm, with 41 components from 25 distinct parts.
Other key parts include the AY-3-8912, 74LS138, 74LS02, 74LS00 and 74LS74. By type, the board carries 13 capacitors, 12 resistors, 6 ICs, 6 connectors, 2 inductors and 1 crystal.
From the project
A set of printed circuit boards created by me.
Melodik was AY interface for ZX Spectrum and compatibles, produced by Didaktik v.d. in 90's. This is my third attempt at making a replacement, as the original PCB was of terrible quality, was breaking down, and the main oscillator tended to start at all sorts of frequencies, just not the right one. The PCB is not verified yet, but it should work.
Main components on the Melodik2
Melodik2 bill of materials (BOM)
41 components, 25 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AY-3-8912 | DIP-28_W15.24mm | U1 |
| 1 | 74LS138 | DIP-16_W7.62mm | U2 |
| 1 | 74LS02 | DIP-14_W7.62mm | U3 |
| 1 | 74LS00 | DIP-14_W7.62mm | U4 |
| 1 | 74LS74 | DIP-14_W7.62mm | U5 |
| 1 | LM386 | DIP-8_W7.62mm | U6 |
| 1 | 3.57954 MHz | Crystal_HC49-U_Vertical | X1 |
| 2 | ZXS_48k_BUS | zxs48kbus | P1, P2 |
| 1 | I/O GATE | PinHeader_1x10_P2.54mm_Vertical | P3 |
| 1 | Audio Out | PinHeader_1x05_P2.54mm_Vertical | P4 |
| 1 | Speaker | PinHeader_1x02_P2.54mm_Vertical | P5 |
| 1 | SOUND | PinHeader_1x02_P2.54mm_Vertical | P6 |
| 1 | 4k7 | PinHeader_1x03_P2.54mm_Vertical | RV1 |
| 2 | 100uH | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | L1, L2 |
| 7 | 100n | C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C7, C8, C9, C10, C11, C12 |
| 2 | 6.8uF | CP_Radial_D5.0mm_P2.50mm | C2, C3 |
| 1 | 1n | C_Disc_D5.0mm_W2.5mm_P5.00mm | C4 |
| 1 | 220uF | CP_Radial_D8.0mm_P3.80mm | C5 |
| 1 | 47n | C_Disc_D5.0mm_W2.5mm_P5.00mm | C6 |
| 1 | 100uF | CP_Radial_D8.0mm_P3.50mm | C13 |
Show 5 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 5 | 470R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R4, R5 |
| 2 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R7 |
| 2 | 1k6 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8, R9 |
| 2 | 8k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R11 |
| 1 | 15R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12 |
Melodik2 design files
The KiCad project lives in the z00m128/pcb-resources repository on GitHub; these links point at the commit this page was built from.
Melodik2: common questions
How big is the Melodik2 PCB?
The Melodik2 measures 78.1 × 85.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Melodik2?
41 components, from 25 distinct parts. The full bill of materials is listed on this page.
Where can I download the Melodik2 design files?
From the z00m128/pcb-resources repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Melodik2 design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
