Buffer
About the Buffer PCB
Buffer is an open source PCB design by hoglet67, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 53.9 × 23.2 mm, with 13 components from 9 distinct parts.
Other key parts include the XC9572XL-VQFP44. By type, the board carries 5 connectors, 5 resistors, 1 IC, 1 diode and 1 capacitor.
It belongs with the retro computing designs in this gallery.
From the project
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
The RGBtoHDMI interface converts the "digital" RGB video signal from the BBC Micro or Electron to HDMI compatible with most modern TV/Monitors. The interface comprises a Raspberry Pi Zero and a specially designed Hat containing a small CPLD. Custom firmware on the Raspberry Pi, in conjunction with the CPLD, is able to correctly sample each of the Beeb's video modes to give a pixel-perfect rendition.
Main components on the Buffer
Buffer bill of materials (BOM)
13 components, 9 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | XC9572XL-VQFP44 74LS08 | SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | CONN_02X20 Conn_02x06_Odd_Even | PinSocket_2x06_P2.54mm_Horizontal | P1 |
| 1 | CONN_02X06_ODD_EVEN Conn_01x04 | PinHeader_1x04_P2.54mm_Vertical | P2 |
| 1 | Conn_01x06 | Molex_PicoBlade_53048-0610_1x06_P1.25mm_Horizontal_Custom2 | P3 |
| 2 | Conn_01x01 | PinHeader_1x01_P2.54mm_Vertical | P6, P7 |
| 1 | D_Schottky | D_SOD-123 | D1 |
| 1 | 10UF 100n | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1 |
| 4 | 47K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R2, R3, R4 |
| 1 | 1K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5 |
Buffer design files
The KiCad project lives in the hoglet67/RGBtoHDMI repository on GitHub; these links point at the commit this page was built from.
Buffer: common questions
How big is the Buffer PCB?
The Buffer measures 53.9 × 23.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Buffer?
13 components, from 9 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Buffer design files?
From the hoglet67/RGBtoHDMI repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Buffer design in my own project?
Yes, under the terms of its GPL-3.0 license, which hoglet67 chose for the repository.
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