An interesting detail is that it has a physical switch to turn it off.
> Utilizing any 12V-capable USB-C power supply
Are different kind of USB-C power supplies, some not outputting 12V? Does it mean that normal phone chargers aren't good?
> Utilizing any 12V-capable USB-C power supply
Are different kind of USB-C power supplies, some not outputting 12V? Does it mean that normal phone chargers aren't good?
> Utilizing any 12V-capable
If so, this is usually at a VERY low wattage. they usually go to a max of 2.5 or 3A max at 12V. I would expect it would use 20V and step-down as 20V is more generally available at a high Amperage. (Note: 3A is the max possible for cables without an E-marker, os if often regarded as a ceiling). This would have made the device much bigger (and more versatile. a clear trade-off).
Actually, I am more concerned about -12V, ... at 0.1A. That seems rather low. Also, the 12V rail itself is only 1.0A. The original supply did 12V@2A and -12V@0.5A if not mistaken, and so does the C64psu.com. Overall, rather low Amp values. This might affect 'stability' if your machine is expanded (although it claims: "of even the most expanded configurations"). Curious if they can share some details. I have a BlizzardPPC in my A1200.
> allows users to tap into a vast array of affordable and readily available “power bricks”
if DC5521 at >12V to 20V is possible, that would be great, as this allows you to use a Lenovo or generic laptop brick, or a USB-C trigger cable. Perhaps something I should make ...
I had crackly audio problems. I swapped the A1200 motherboard (a few years back when they were still fairly cheap on eBay), and still had the same audio problem. Only then did I investigate+repair the PSU issue.
Recently built a replacement Amiga PSU from a MeanWell PT-65B board in a 3D printed case. This USB-C option would have been neater and easier (so long as it puts out enough power for a PiStorm as well as the Amiga)
This is why you always check the voltages first.
Too low current on the -12V rail can cause crackling sound. I use my A1200 machines mostly for this, although more using AHI than before.
External drives should have their own power supply and indeed the A590, A570, GVP drives etc all do.
The A500/A2000 Technical Reference (page 227) shows that the 12V current limit on the expansion connector is 50mA
The A600/1200 don't even have the expansion connector
Page 5 of the TRM specs the -12V supply at 100mA
> Too low current on the -12V rail can cause crackling sound.
Maybe if the current is zero
TRM: https://archive.org/details/CommodoreAmigaA500A2000Technical...
In actual use, a "wedge" Amiga consumes just below 30mA from -12V line.
Visit our page, there is now a detailed FAQ and a list of various USB-C power supplies we tested with PowerShark.
Maybe the original power supply was oversized to avoid efficiency loss near 100% load, or because precise overcurrent protection wasn't available?
There was (that I could find, and I did go back to check again) no mention of price other than "TBD", which probably means it's not aiming to be a cheap solution. Trying to guesstimate but it's hard, I'm not enough "into" the Amiga retro scene. $99 feels like too much ... $79?
Finally, I found the copy on the site a couple of generous notches above 10 and really think it would help to tone it down just a little. But maybe that's just me being grouchy, as someone who grew up on Amigas it's really great to see this kind of development and continued interest in the machines! Good luck!
It is the switch for turning the computer on. The original power supplies all had it on the box.
I had my power supply on the floor under the desk and was used to flipping it on and off with my foot. I used the heavy supply from my A500 with a A1200 later.
That being said, the claim that it works with "any 12V-capable USB-C power supply" sounds very ambitious. Is any 12-V capable USB-C power supply capable of delivering 60+ watts?
5V: 4.5A
12V: 1.0A
-12V: 0.1A
It's a bit if a moveable feast how much power an amiga is drawing these days. Certainly, back in the 90s, the original a1200 power supplies often needed to be replaced with something that could deliver more, and the a500 supplies were favoured
Seemed to run OK with a Pi 4 on an original Commodore PSU, or at least nothing appears to have blown up or melted when running it for short periods.
Maybe I'm pushing my luck, but then again, back in the day, you'd often be running an accelerator board, hard drive, and a couple of floppy drives from that same PSU, so maybe it's up to the job.
Confused by:
> allows users to tap into a vast array of affordable and readily available “power bricks”
followed by
> Furthermore, portable USB-C “chargers” are also supported,
So I expect it means it has a USB-C plug and you can feed 12V directly like with the Miniware / Pinecil soldering irons. Though, is this protected for overvoltage?
> If an over- or under-voltage
So, most likely you can only feed 12V. A Dell-brick , like the DA-2 would work: 12V@18A = 216W... but the plug itself has a max 12V@1A :-/. So a cheap 12V@5A brick might be enough for the total wattage (including the 5V rail).