this post was submitted on 08 Sep 2023
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I think you'll need a "real computer" to act as host device. Having said that, you could use a Raspberry Pi to be your "real computer". You might be able to fake something out, but an MP3 player will usually act as a storage device, and another device will have to act as host to load it with files. You might find an MP3 player that can connect to some cloud service, but that undermines the whole point.
I've currently got 2 functioning MP3 devices. Well, technically 1, since I gave one to my dad.
The one I gave to my dad is this guy, a Sandisk Sansa Clip. It connects as an MTP device via USB cable. Copy files into it's storage, disconnect, and go. Any computer capable of acting as an MTP host should work.
The one still in my possession is an earlier version of this one, the Mixxtape. They are regularly on sale for around $60 USD IIRC, so not the cheapest, but it can also play back via a tape deck, like my very first MP3 player, the Digisette Duo Aria MP3 player, with a whopping 32MB of storage! I guess my first MP3 player wasn't the most capable, but the Mixxtape evokes that nostalgia for me, plus is far more capable. Again, it mounts as an MTP storage device, so any other device capable of hosting an MTP connection should work.
As to your comment on OS, I've been using Linux primarily for well over a decade, and it supports MTP just fine. The only problem you'll run into is older MP3 players from before USB Mass Storage Class (MSC), Picture Transfer Protocol (PTP) and Media Transfer Protocol (MTP) were widespread. I think some early models had custom file transfer schemes. That hasn't been a thing for well over a decade. Except maybe for iDevices. Apple (as always) is special. From my experience, plugging any MSC/PTP/ or MTP device into just about any Linux computer will "just work". It should "just work" for Windows as well.
Finally, a "real computer". Something like a Raspberry Pi 400 kit should work fine, but there are also lots of perfectly fine ex-office computers for sale refurbished at similar prices. Best Buy also has refurbs. An old laptop would work as well. You might be able to use the Pixel to host. I know the Pixel supports USB-OTG or whatever the successor protocol is, allowing it to act as a USB host for limited power devices. Only way to find out is to try.
As an 80s kid, that Mixxtape just blew me away 🤯😍 Talk about must-own gadgets that I absolutely don't need! Man, that's slick!
Analog playback, insane 😳😍
Now I just need Paulthings to make the Mixxtape's older sister: a digital to analog reel-to-reel tape 😱 Maybe call it the 2real2reel? REELxREEL?
I saw a product mock-up years back of a digital device shaped like a roll of 35mm camera film. The concept was that you insert it into your old analog 35mm camera instead of film, and it turns the camera into a digital one. Basically a universal digital SLR back. Was heartbroken when it turned out it was just a concept with no plans to create it. I'd go and buy an old Pentax 35mm SLR faster than the guy in the Mixxtape video can dish out Yo Mamma jokes.
I'll see if I can find it. I still think it would be the most revolutionary camera gadget to come out in ages; imagine being able to take any old 35mm camera and turn it digital in an instant 😮❤️ Old cameras on eBay would quadruple in price overnight.
Edit: Found the "digital film" concept, was released back in 2011.
The biggest problem I can see with this digital back idea is that full frame sensors are hella expensive and require a lot more electronics than could fit in that space. This 20MP sensor, for instance, is $4000 by itself.