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Forum Index : Microcontroller and PC projects : PicoMiteHDMIUSB motherboard reference design

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Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7301
Posted: 01:51pm 11 Mar 2025
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It's not rated for that. Just put three or four 1N4007's in series with the supply. That'll drop the voltage by a volt or two. My PCB allows for a series Schottky diode for polarity protection (ctr +ve on a barrel jack) so you could use that area of the board to hang them in mid air.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
mclout999
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Joined: 05/07/2020
Location: United States
Posts: 481
Posted: 04:18pm 11 Mar 2025
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On this new board is that footprint for an IC for PSRAM?  If so I would like to get one of these boards.
 
Mixtel90

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Posted: 05:17pm 11 Mar 2025
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Yes - U33 is a PSRAM. :)
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 9730
Posted: 05:26pm 11 Mar 2025
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I'll post the gerbers etc. once I've tested the ones I've ordered. They are currently on route from Hong Kong
 
mclout999
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Posted: 05:16pm 12 Mar 2025
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  Mixtel90 said  Yes - U33 is a PSRAM. :)


Thanks for answering.  What is the largest capacity chip that can be used there and what is it so I can order some?  Maybe someone can order the boards with one Assembled on it. and I would like to be the first one to say I'll pay for one. I think we have to wait until we get a go-ahead from matherp after he gets his card in.
 
Mixtel90

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Location: United Kingdom
Posts: 7301
Posted: 05:27pm 12 Mar 2025
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Interesting...
The S09 buck-boost converter will run from a single 18650 and draws around 390mA when powering my PiccoGAME HDMI. The HDMI signal went off as the cell reached about 3.4V so it's not something I'd recommend. Two cells would be realistic though.

That's it from my little intrusion into this thread, much to everyone's relief, no doubt. :)

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I like the look of this new board from Peter. I might be tempted...  :)
Mick

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