teensy 4.1 with psram

[flok]

Hi,
Does anyone know a webshop that sells teensy 4.1 with ps-ram (and Ethernet) to Europe? (the Netherlands to be precise)
I found only one webshop, but that was usa only (https://protosupplies.com/).

 

[Rolfdegen]

https://eckstein-shop.de/PJRC-Teensy-41

https://www.berrybase.de/psram-chip-fuer-teensy-4.1

 

[KenHahn]

@flok if you have difficulty finding what you need in the EU, ProtoSupplies.com does have many international customers in the EU, including the Netherlands that order from us using package forwarding services which work very well. You can find more info about it at this link: https://protosupplies.com/international-customers/

 

[SparkFun]

It also looks like 4.1 is available in your region from TinyTronics: https://www.tinytronics.nl/en/development-boards/microcontroller-boards/teensy/teensy-4.1

 

[flok]

It also looks like 4.1 is available in your region from TinyTronics: https://www.tinytronics.nl/en/development-boards/microcontroller-boards/teensy/teensy-4.1

That's without PSRAM.

I decided to order a few of those spi-ram chips and see what my soldering-skills are worth.

 

[PaulStoffregen]

It's much easier if you solder the chip before adding header pins or wires.

Best to run the memory test program to confirm it's really working before adding other stuff that blocks easy access to the chip.

 

[MichaelMC]

16MB PSRAM chips are now in stock in the UK from: https://thepihut.com/products/16mb-psram-chip-for-teensy-4-1
I just bought 6 for 3 boards.

 

[bk40]

16MB PSRAM chips are now in stock in the UK from: https://thepihut.com/products/16mb-psram-chip-for-teensy-4-1
I just bought 6 for 3 boards.

I seen that this week brilliant how quick they added the option. Really like that site. (Bank balance doesn’t)

 

[flok]

Haha oh dear now I can see why the test-program said it has 0 MB of PSRAM |
Learned a few things already:
* glue the chip to the board first (at the sides)
* glue the teensy to the table first
* don't breath during soldering

 

[flok]

Ok fixed and all memory tests passed!
I'm surprised as it took me a long time to solder so the chip must've gotten really hot.

 

[h4yn0nnym0u5e]

From the start:

1. Put a tiny blob of solder on one corner pad
2. Using tweezers position the PSRAM as best you can
3. Reflow just that corner pad
4. Solder the opposite corner pad; you can make minor position adjustments with the tweezers, the legs are slightly flexible - test before you solder!
5. Solder another corner, then reflow the first pin to relieve stress if you adjusted the position in step 4
6. Do the remaining pins

It only takes a tiny amount of solder, but do heat the joint for long enough for it to flow in; your first try looks to have about 4x the amount of solder actually needed. Yes, keeping the Teensy stable is pretty important

 

[MarkT]

More flux; less solder....

Silicon devices are very robust to high temperatures. Back in the days of germanium devices this wasn't so and it was easy to cook a device, but silicon devices, unpowered, can usually tolerate higher temperatures than their packages!