You have a pile of devices meant for random incompatible chargers, you need different tips for each(Although in the last 10 years 2.1mm and 2.5mm have largely t

You have a pile of devices meant for random incompatible chargers, you need different tips for each(Although in the last 10 years 2.1mm and 2.5mm have largely taken over). The solution, as far as I'm concerned has 2 parts: * Stop making gadgets that take non-USB power, except for things that take 2.1mm and can handle at least the 9-15v range(Some applications you really want splitters and extensions so USB might not be ideal) * Start making USB-PD trigger modules that can use PPS to get exact specific voltages. There's nothing expensive about that, the adapter does all the work. Right now we are about halfway there. If your device can take 5, 9, 15, or 20v(Unfortunately, none of those voltages are that common), you can just buy a USB-PD trigger adapter, they are sold with all kinds of different tips. If your device needs some other voltage, triggers seem to exist but are harder to find. Old 6v things often will take 5v(Especially since 6v sometimes actually meant "The voltage of 4x AA batteries"), 24v audio stuff can sometimes run on 20v unless you turn up the volume (It will clip). If you get a buck or buck boost regulator modules with screw terminals($4-$8) you can attach some barrel jack pigtails to it and make a "20v to your exact voltage" adapter. Now you can power it with a 20v USB-PD trigger adapter, and it's way more convenient that a lab power supply (I get a lot of hate for it, but I always say lab supplies are kind of overrated for most DIYers). Cover the whole thing in heat shrink or tape and you've got a pretty good adapter, and they're cheap enough and easy enough to make that you can have one for every gadget. One of very few DIY electronics projects(If you can call it that) which I consider to be practical. If you want to really invest a lot of effort for the sake of all humanity, I'd say get a bunch of PDC002 cables, preprogram them for different voltages with PPS, durably mark and color code them so nobody mixes them up, and sell them in combo packs along with a good PPS charger, maybe with some labels to put on devices to make it easier to help non-technical people match them. TL;DR USB-C is amazing and solves so many problems.