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matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 9122

Posted: 08:18am 10 Aug 2022

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VGAMite (Bill Of Materials).zip

Quote Also, what are the optional solder links on the board for? (like the ones by GP6 and GP7). This board isn't very searchable, so it's not obvious if you've ever described what they do.

Quote Is that one or both power regulators required?

Quote Changes:
Option for LM1117 regulator
SDcard swapped for the "standard" Maximite version (same as Geoff's PicoMiteVGA PCB)
Revised audio filter as per Volhout (thanks)
Revised VGA I/F using just 4 resistors and no diodes
40 way connector now wired correctly (pins 21-40 were wrong)
By default the VGA and audio pins are not connected to the two Pico additional footprints or the edge connector. Connection can be made using a solder blob on the shorting links
Traces re-routed to improve signal quality for audio and VGA

Quote Also, I see there's a nice stereo audio out: what's it typically feed into? Headphones? Speaker? Amp?

Anything with highish impedance input - say 300ohm

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4243

Posted: 07:29am 02 Sep 2022

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Hi Peter,

Just investigating.. Do you have a spare 1.7 board that you can put in an envelope and mail to me?

If not, I will order some boards.

In that case, do you (or anyone else) need 1 or more boards.

Regards,

Volhout

PicomiteVGA PETSCII ROBOTS

scruss
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Joined: 20/09/2021
Location: Canada
Posts: 86

Posted: 09:22am 02 Sep 2022

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Volhout - I've got a couple of boards from the July 29 release (which is as "final", but with a minor silkscreen error). Shipping even one from Canada would likely cost more than a full JLCPCB order, though

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4243

Posted: 10:47am 02 Sep 2022

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Hi scruss,

With Tom (thwill) from UK and Mick (bigmik) we have simply slid a single PCB in an envelope and send is as a post card (letter) with standard post stamp. Successfully.
Not sure if that works all the time, but it seems a way to avoid excessive transportation cost.

Not sure if this works for Canada though....

Volhout

PicomiteVGA PETSCII ROBOTS

Volhout
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Location: Netherlands
Posts: 4243

Posted: 05:26pm 02 Sep 2022

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Ill await Peters answer, and then order some myself.

Thanks for the respons..

PicomiteVGA PETSCII ROBOTS

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4243

Posted: 01:40pm 27 Sep 2022

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OK,

Ordered 5 boards of the 1.7 release. I probably need 2-3 myself, so I have 2 to give away... They should arrive 4 weeks from now.
PM me if you are interested.

Volhout

PicomiteVGA PETSCII ROBOTS

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4243

Posted: 08:26am 28 Sep 2022

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For those who do are running out of PS2 keyboards, this cheap keyboard works with picomite VGA. It has slightly larger travel than the real laptop keyboard, and slightly heavier force required. But for the price, you can't beat it...

Make sure you order the PS2 version, not the USB version....

small PS2 keyboard

Volhout
Edited 2022-09-28 18:27 by Volhout

PicomiteVGA PETSCII ROBOTS

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6798

Posted: 08:51am 28 Sep 2022

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Thanks - that looks like a rather nice little keyboard. I'm not running out, but I might get one anyway as all mine have a numeric pad. I might have to live without UKP and pay everything in $ though. lol

Shipping is a little pricey.
Edited 2022-09-28 18:54 by Mixtel90

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4243

Posted: 07:03am 12 Oct 2022

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JLCPCB was fast

Less than 2 weeks and the boards where in Netherlands..
And less that 2 hours later.......
Up and running...
Good thing that between 1.4 and 1.7 the location of the connectors was not changed, so I could mount the 1.7 board 1:1 in the case.

Thanks Peter !!

P.S. I have 2 board spare (1.7 version). PM me if you need one...

PicomiteVGA PETSCII ROBOTS

Mixtel90

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Posted: 08:29am 12 Oct 2022

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It makes up into a very nice little unit, doesn't it?

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 3802

Posted: 08:57am 12 Oct 2022

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Looks good!

John

Frank N. Furter
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Joined: 28/05/2012
Location: Germany
Posts: 830

Posted: 07:04am 21 Oct 2022

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@Volhout:

Do you have a template for your pretty bezels? They look very professional!

I would have to make some for my housing as well...

Frank

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4243

Posted: 07:28am 21 Oct 2022

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Hi Frank,

The bezels came with the box (the G738A from Farnell). I just drilled some holes in it and filed (is that je right word ?..grinded ?) them to size.
I can "photocopy" them if you like, but I have no CAD files.

Regards,

Volhout

PicomiteVGA PETSCII ROBOTS

Mixtel90

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Posted: 07:51am 21 Oct 2022

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This would be something that SL6 might be good for. The front and rear plates could then be made as PCBs in your choice of solder resist colour with white or black screen printing. :)

Unfortunately they are too big to fit ito the 100x100 special offer size at JLCPCB.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

Frank N. Furter
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Joined: 28/05/2012
Location: Germany
Posts: 830

Posted: 02:17pm 21 Oct 2022

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Hi Volhout,

that would be great!

THANKS!

Frank

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4243

Posted: 08:58am 22 Oct 2022

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For contrast I added orange paper...
The manual drilling and grinding causes damage to the visible surface, so I took some sanding paper to give the Aluminum a cleaner look.

Edited 2022-10-22 18:59 by Volhout

PicomiteVGA PETSCII ROBOTS

Frank N. Furter
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Posts: 830

Posted: 05:27pm 22 Oct 2022

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Thank you very much!
I'm currently toying with the idea of laser cutting the appropriate parts out of plastic in our FabLab.

Frank

scruss
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Joined: 20/09/2021
Location: Canada
Posts: 86

Posted: 05:47am 30 Dec 2022

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Question about the LM1117 LDO regulator: it's really a 1.8 V value? (The BOM says LM1117T-1.8/NOPB). Thanks!

Also, the SD card holders seem to be available again. The parts you can actually buy are the DM1AA-SF-PEJ(82). The DM1AA-SF-PEJ(21) on the BOM seems to be an older revision.

Looking forward to getting this running. I'll have to make a component run to pick up some 2R2 resistors and the right LDO. All I've got for regulators are 7805s or LD33Vs

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4243

Posted: 06:39am 30 Dec 2022

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3.3v regulator. Ld33v may work. 1.7layout is dual footprint.

PicomiteVGA PETSCII ROBOTS

scruss
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Joined: 20/09/2021
Location: Canada
Posts: 86

Posted: 04:06pm 30 Dec 2022

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Volhout said 3.3v regulator. Ld33v may work. 1.7layout is dual footprint.

Much appreciated!

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