Edoardo kinmami

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Description

Commodore Amiga RGB VGA adapter V2

UPGRADE to a NEW version

https://www.pcbway.com/project/shareproject/Commodore_Amiga_DB23_RGB_External_Video_Buffer_V6_Compatible_with_GBS_8200_822_00cf763f.html

It adapts 15KHz RGB + H/V SYNC from Amiga DB23 port to VGA DB15.

Optionally it provides a buffer for digital sync signals.

Ferrite beads reduce the risk of noisy RGB lines.

A termination (resistor) for /C1 pin avoids peak noise as well.

Very compact design.

Tested with A500/+, A600, A2000, A1200, A4000 PAL and NTSC.

M74HCT14B1R (DIP) (x1) and socket

0.1uF MLCC X5R (or X7R) 1608/0603 (x1)

BLM18SP221SN1D chip beads (x4) 220 Ohms @ 100 MHz 1608/0603

47 Ohms (x1) resistor 1608/0603

https://hackaday.io/project/180442-rmixx500-amiga-500-mainboard/log/195925-understanding-fixing-rgb-noise

Download BOM(Bill of materials)

Jul 15,2021

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Commodore Amiga RGB VGA adapter V2

It adapts 15KHz RGB + H/V SYNC from Amiga DB23 port to VGA DB15. Optionally it provides buffer for digital sync signals.

6615

Published: Jul 15,2021

BOM(Bill of materials)

Centroid file

PCBWay Donate 10% cost To Author

File Last Updated: 2023/10/09 (GMT+8)

File update record

2023-10-0914:30:15

Parts List (BOM) is updated.

2023-05-2914:59:25

Parts List (BOM) is updated.

2023-01-3114:20:47

Centroid file is updated.

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Topic

DIY Electronics

Computers & USB

video rgb commodore amiga vga

Comments(16)
Likes(22)

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Markus Wenzel
I have some questions...
1. What are the pins under the HCT14 for? (HS and VS)
2. What is the single pin marked as "CS" for between pin 9 and 10 of the DB23?
3. Why are 2 pins of the HCT14 marked with HS and VS?

I'm assuming it's Horizontal and Vertical Sync, but don't understand what can or should be done with them...
Do they need to be bridged if someone wants to build the Adapter without buffering?

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Nov 25,20241 Comments
Edoardo kinmami 2024-11-26 06:33:42Reply
1 you can bypass the sync buffering without installing the HCT14, in this case solder jumpers are closed
2 composite sync
3 to identity test points if the HCT14 is installed

this is an old (and non optimized) version. the latest versions are V6 and V7
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Mizo
Hi Kinmami, I just ordered the V2 board with assembly, then noticed about version 4, can I get BOM of the new version, or the added text in the "Description" enough for the PCBWay team to assemble it, thanks in advance

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Jul 15,20221 Comments
Edoardo kinmami 2022-07-15 11:46:10Reply
Hello M74HCT14B1R (DIP) (x1) and socket 0.1uF MLCC X5R (or X7R) 1608/0603 (x1) BLM18SP221SN1D chip beads (x4) 220 Ohms @ 100 MHz 1608/0603 47 Ohms (x1) resistor 1608/0603
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Edoardo kinmami
updated to version 4 https://www.pcbway.com/project/shareproject/Commodore_Amiga_DB23_RGB_External_Video_Buffer_db339e85.html

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Apr 18,20220 Comments
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Edoardo kinmami
Hi Lee, no problem. that`s correct. I manufactured mine like that. I had not any issue. You can go ahead with production.

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Aug 03,20214 Comments
Lee Nordling 2021-08-03 14:11:21Reply
Does it just mean that they will only put 0.3mm hole in the board on those side pads (connector anchor points)?
Edoardo kinmami 2021-08-03 15:07:34Reply
It means they do not need to modify anything. the drill size is 4.0mm (outer diameter 5.8mm) and holes perfectly fit the suggested VGA D-Sub15 connector.
Lee Nordling 2021-08-03 18:11:09Reply
No worries. Thanks for the clarification. I look forward to building and testing it out.
Edoardo kinmami 2021-08-03 20:45:12Reply
Sure. Please use a good quality VGA cable (for example https://www.amazon.com/UGREEN-Extension-Monitor-Adapter-Projector/dp/B00P0CMKB0 )
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Lee Nordling
Hi kinmami. Just got this back from PCBWay.. "plz check the screenshot, we got the file like this." (sorry, had to make new comment so I could attach the screenshot.)

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Aug 03,20210 Comments
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Lee Nordling
My first time using this service so forgive my error if this is not the right place to query this.. When I add this project to my cart it comes up with the file name "AMIGA VGS DB23 buffer V3.zip" - Is that correct? Also, feedback I have received from PCBWay is "We found the drill size in your drill layer is not the same as it is in the board outline - can you confirm?" - The hole size shown on the PCB spec is 0.3mm, is that correct?

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Aug 02,20211 Comments
Edoardo kinmami 2021-08-02 10:10:48Reply
Hi Lee. There is an unique zipped gerber file. AMIGA VGS DB23 buffer V3.zip is correct. The zip archive does contain the drill file (in inches) as well.
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Marco Manuel
Where do you buy the 23 pin Sub-D connector or do you modify a 25 pin one?

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Jul 15,20212 Comments
Edoardo kinmami 2021-07-16 07:23:26Reply
I have new old stock of DB23 bought in the US ten years ago. You can adapt the DB25. Recently they are selling DB23 on forums and ebay.
Edoardo kinmami 2021-07-16 07:26:27Reply
https://www.ebay.com/itm/184573417566?ssPageName=STRK%3AMEBIDX%3AIT&fromMakeTrack=true
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