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Added README for VGA adapter

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Andrew McPherson 2020-04-06 02:11:45 +01:00
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# VideoMacPac video adapter
These design materials are in the public domain, with no warranty whatsoever. See `documentation` on this repository for further design notes and `photos` for a photo of the assembled board.
## EAGLE files
* `VideoMacPac_adapter.sch`: EAGLE schematic
* `VideoMacPac_adapter.brd`: EAGLE PCB design
* `schematic.png`: image of the schematic
## Gerbers
This is a 2-layer PCB which can be fabricated from the files in the `gerbers` directory. It is a simple design which can be made on a mill with no soldermask as long as it has plated-through holes. The most important files are:
* `copper_top.gbr`: top copper
* `copper_bottom.gbr`: bottom copper
* `profile.gbr`: board outline
* `drill_1_16.xln`: Excellon drill file
## Bill of Materials
| Name | Value |
| ------- | ------------------------------------- |
| C1-C2 | 0.1uF 0603 capacitors |
| IC1 | 74LVC245 (20-SOIC) bus transceiver |
| IC2 | MCP1700-3302T (SOT23) 3.3V regulator |
| J1 | DB25 female |
| J2 | HD15 (VGA) female |
| R1-R3 | 133 ohm 0603 resistors |
| R4-R6 | 150 ohm 0603 resistors |
| R7 | 100 ohm 0603 resistor (could use 150) |