Coming soon




not routed yet and component placements may change but you get the idea

Nice. Your silk screen has GP37 twice.

Nice. I like. :)

  matherp said  

Coming soon

...

not routed yet and component placements may change but you get the idea

It's worth the wait.

Can JLCPCB mount the RP2350? Because I couldn't solder it on by hand.
Edited 2025-03-05 02:15 by ManiB

  ManiB said  

  matherp said  

Coming soon

...

not routed yet and component placements may change but you get the idea

It's worth the wait.

Can JLCPCB mount the RP2350? Because I couldn't solder it on by hand.

Yes, JLCPCB will do the assembly  

Greetings
Daniel

  matherp said  

ManiB

Please hold off for a day or two. I'm going to update the design with a minor change.

There you go, Peter, that's your ‘minor change’ ;)

I don't know you personally, but now I can get a clear picture of you: ‘A professional with attention to detail’.

I celebrate this board the more posts I read every day.

I plan to document my experiences and make them available here on the board. I know this won't really impress you ‘old hands’, but if someone faces the same challenge in the future, it can be very useful.

@Peter,

Are you using the exact same ‘adjustable DVDD’ circuit on this unit as you used on the DIL module?

Great work (as always!!!!!)

@Peter,

- silkscreen text: "jumpers at CN4" refer to a switch ?

- Would it be an option to add a buck/boost for the 5V ? You have suggested multiple times that a "good USB-C" cable is needed. Not for communications, but for voltage drop on the power conductors. A buck/boost convertor would guarantee adequate 5V for the attached 4 USB devices, even when the voltage on the USB-C drops to 4V.
Something like this (but then put on the board, not as a module). With proper design you could even make this compatible with 12V/20V on USB-C (with a fast charger).




Volhout
Edited 2025-03-05 18:46 by Volhout

  Quote  

Are you using the exact same ‘adjustable DVDD’ circuit on this unit as you used on the DIL module?

Yes

Schematic

ddf6cc27-0325-48cc-9c50-870099aae8e6.pdf

Routed versions





Edited 2025-03-05 18:57 by matherp

The excitement continues    

Peter,

It is nice to have adjustable DVDD, but when many are building this version, you may want to standardize on a value. In that case a bypass of R1V1 would be needed.
For experiments R1V1 is great, but you do not want people playing with it to the extend that it can do more harm than good, or worst case destroy a chip.

On the PCM5102: it has a charge pump build in (creating a negative voltage). It does that by chopping the 3.3V. Why do you power the chopper input pin to analog Vdd and analog ground ? It is the most noisy in the whole audio circuit. Is this what the datasheet tells you ?

Volhout
Edited 2025-03-05 20:16 by Volhout

@Peter,

What’s the functionality of SW17 please (Primary Flash enable?)

The datasheet explicitly shows the charge pump with the same supply as the analog circuitry



A final version can have a fixed DVDD but for the moment I need to be able to adjust it to tune the overclock.

  Quote  

What’s the functionality of SW17 please (Primary Flash enable?)

BOOT
Edited 2025-03-05 21:02 by matherp

Hey Pete, Is there gonna be a 4th mounting hole or just the 3?

With that size board I've managed with just two diagonal holes, even at 1.2mm thickness. I wouldn't worry too much. :)  If you use 1.6mm board it won't flex at all without a hammer...

  Mixtel90 said  

With that size board I've managed with just two diagonal holes, even at 1.2mm thickness. I wouldn't worry too much. :)  If you use 1.6mm board it won't flex at all without a hammer...

Looking at stacking my own board with it but I don't like flex.  

It will be back

  matherp said  

It will be back

Is that you Arnold?  

@ Volhout

I've just modified a 3V3 version of one of those little S09 buck/boost converters to 5V by changing the feedback resistor to 150K (I don't happen to have any 5V ones). I have it powering my PicoGAME HDMI with wireless keyboard, two generic gamepads and a SD card. Barely warm hanging in free air and the output voltage has barely dropped from the off-load voltage.

103mA drawn from a 12V supply to the convertor, 169mA at 7.5V. My little 300mA power supply is shutting down when I try lower voltages, which makes sense, I think.

Watch out for a new "portable" design with 3-15V (well, that's what they say) input. :)

Would it cope with 15.4V?

Not for me, but some cars have a "12V" around there (from the charging circuit).

John