2 layers96.8 × 97 mm
Psoc5power
profdc9/DRSSTC-PCB-Pack
A pack of PCBs for a dual resonant solid state tesla coil setup. Pretty much everything you need.
133 parts59
2 layers59.7 × 45.1 mm
EGA2RGBC
hkzlab/EGA-2-RGBS7EPROM based EGA/CGA to analog RGBS converter
- Size
- 59.7 × 45.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 35
- Pads
- 123
- Tracks, vias
- 382, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 10 Jan 2021
- Updated
- 9 Nov 2021
Overview
EGA2RGBC is an open-source printed circuit board by hkzlab, from the hkzlab/EGA-2-RGBS repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 59.7 × 45.1 mm with 27 parts on 35 nets, routed with 382 tracks and 0 vias.
It is built around the 1N4733A. Its parts include 10 resistors, 5 capacitors, 4 connectors, 2 ICs and 2 diodes. It belongs with the retro computing and games and lEDs and displays boards of this library.
Main components
1README
README.mdEGA-2-RGBS
Months ago I ran into this video on YouTube that described how to implement an EGA/CGA to analog RGBS signal using just a ROM and a few passive components. Thinking it was a nice idea, I decided to implement my variant of it (including the tool that generates the values to program the EPROM), also including an optional buffer on the outputs of the ROM.
CAVEAT EMPTOR: For now I tested this board only in DOS with a CGA card. Will update this note when I test EGA and colours.
Note that this will not convert EGA/CGA to VGA, it will just make the signal analog and compatible with either a SCART input or a scaler like the GBS8200 (tested with gbs-control firmware).
Jumpers
- JP1: Bridge if you are using this with an EGA card, remove bridge for CGA
- JP2: Disable Brown colour fix for CGA. No effect on EGA
- JP3: Bridge 1-2 to output a CSYNC signal, bridge 2-3 for /CSYNC
Building the board
BOM
- 1x 20pin socket (on U2)
- 1x 32pin wide socket (on U1)
- 2x 100nF ceramic caps (C5 and C4)
- 1x Right angle DB9 female PCB connector (J1)
- 1x 6 or 5 pin screw terminal (J5)
- 1x 2 pin screw terminal (J4)
- 1x 1206 SMD fuse rated around ~100mA (F1), 100mA is already very high for the power consumption of the board, but I had these at hand
- 1x 3 pin 2.54mm male pcb header, plus jumper (J3)
- 2x 2 pin 2.54mm male pcb header, plus jumpers (JP1 and JP2)
- 1x First random led you have at hand, optional (D2)
- 1x 1N4733A 5.1v zener diode (D1)
- 1x 74HC244 DIP, optional (U2)
- 1x 27C010 DIP (U1)
- 4x 470 1/4w resistors (R2, R4, R6, R10)
- 3x 1.5k 1/4w resistors (R3, R5, R7)
- 1x 1k 1/4w resistor (R11)
- 2x 4.7k 1/4w resistors (R8, R9)
Remember to program the EPROM with the bin file provided in the repository.
Building on the cheap
You can omit the following components:
Power
Omit F1 and D1, bridge the two connections points of F1. Do this if you trust your power supply and yourself not to make shorts.
You can also omit the power indicator led D2 and its resistor R11
Sockets
You can omit both U1 and U2 sockets. Remember to mount C4, C5, R8 and R9 on the underside of the board if you do this.
Output buffer
You can omit U2 entirely. Just bridge the following points on the footprint:
- 2->18
- 4->16
- 6->14
- 8->12
- 11->9
- 13->7
- 15->5
- 17->3
Also omit C4 in this case.
Credits
- TheRasteri on YouTube for the original idea
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 470 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2, R4, R6, R10 |
| 3 | 22pF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C2, C3 |
| 3 | 680 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3, R5, R7 |
| 2 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C4, C5 |
| 2 | 4.7k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R8, R9 |
| 1 | 10k | Resistor_THT:R_Array_SIP9 | RN1 |
| 1 | 1N4733A | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R11 |
| 1 | 250mA | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | 27C010 | Package_DIP:DIP-32_W15.24mm | U1 |
| 1 | 74LS244 | Package_DIP:DIP-20_W7.62mm | U2 |
| 1 | Brown Fix | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | CSync Selection | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J3 |
| 1 | EGA Input | Connector_Dsub:DSUB-9_Female_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset7.48mm | J1 |
| 1 | EGA/CGA | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | Power | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J4 |
| 1 | Power | LED_THT:LED_D2.0mm_W4.8mm_H2.5mm_FlatTop | D2 |
| 1 | Video Out | TerminalBlock:TerminalBlock_bornier-6_P5.08mm | J5 |
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Questions
How big is the EGA2RGBC PCB?
It measures 59.7 × 45.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the EGA2RGBC use?
27 parts, built around the 1N4733A. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the EGA2RGBC KiCad files?
From the hkzlab/EGA-2-RGBS repository on GitHub, at the commit this page was made from: the board is EGA2RGBC_EPROM/EGA2RGBC.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the EGA2RGBC design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).