QL Pico VGA

[Peter]

I found this diagram very helpful, I think the one of the original project is not very clear and seems to show pin 4 as grounded.

It is actually a possible source of problems. It shows pin 11 not grounded, which will cause some monitors to fail.
Wiring is correct in the schematics I have published.

[Jbizzel]

Thanks @peter. I'm confused pin 11 isn't rounded in the guide I followed https://github.com/holmatic/video_if_ql_vga so I haven't grounded pin 11 either. On that link I posted is shows pin 4 as grounded, which isn't correct either. While the text description is correct. Still, this caught me out!

Where is you schematic please?

[Peter]

Where is you schematic please?

On an earlier page of this topic. viewtopic.php?p=50584#p50584

[bwinkel67]

Finally found the time to order a nice D-Sub hood for my miniaturized version. Type Conec 16-001810E. It has an optional side cable exit, the cable relief for it should be filed off a little. With the circuit fitted, it looks like this:
qlminivga_case.jpg
And the completed QL to VGA adaptor cable:
qlminivga_complete.jpg
Had I waited for a black cable, it would be perfect.

My latest AliExpress order had room for this to bring it to free shipping (something like $1.70 for the RP2040 Zero. Can't wait to try creating this in a nice small package.

[Peter]

My latest AliExpress order had room for this to bring it to free shipping (something like $1.70 for the RP2040 Zero. Can't wait to try creating this in a nice small package.

That makes the D-Sub hood more expensive than the converter Are you doing it without a carrier PCB?

[bwinkel67]

That makes the D-Sub hood more expensive than the converter Are you doing it without a carrier PCB?

That I don't know yet...It'll be a few weeks before it gets here.

[Derek_Stewart]

Hi,

I have some PCBs to build, just received some RP240-Zero.

I was going to use the Conec 16-001810E, which looks really good, but in low numbers is expensive.

Maybe a 3D printed enclosure would be a possible solution.

[Peter]

I was going to use the Conec 16-001810E, which looks really good, but in low numbers is expensive.

Compared to previous converters, it is still very cost effective.

[Derek_Stewart]

I was going to use the Conec 16-001810E, which looks really good, but in low numbers is expensive.

Compared to previous converters, it is still very cost effective.

Hi Peter,

Yes the PicoVGA adapter is the best version, really well designed.

I have 20 PCBs, so will get them built.

At present I am under a little external pressure, which is inhibiting the starting of variour hardware projects.

[Marcel_X]

Sorry, I am late to the party...
I've recently picked up the love for my QLs again and one of the things I was missing was a decent display.
I've read the whole thread and decided to make my own.
Found a nice case (a Pactec CNS-0101) and made the PCB to fit inside this case.
It's is based on the Pi Pico or Zero, but decided to include all components on a single 4 layer 1mm PCB to make it fit between the pins of a D-Sub15.
In hindsight I should have printed my own case, because I have a total of 4 connectors now.
One DIN, D-Sub 9 male and female and a D-Sub 15 female for the VGA, which makes the whole a bit on the expensive side.

This is what it looks like now:

There is an option for a jumper (not populated) in case I want to feed the 5V from the RGB connector.

I have a few spare boards left, so I can build a few more if anyone is interested.
If you feel confident with your soldering skills, I can also supply the bare board.

Holmatic (I don't now his real name) did a fantastic job! Tested with a few monitors and my TV and the picture is excellent!
Credits to him are on the PCB.

I might respin the board and just use a DIN connector and a D-Sub 15.