Charge old devices on USB C.?

So I have a nice new charger that works great with my switch, phone, and laptop. I would like to charge some older devices. I tried plugging in an old USB A to micro USB cord into the charger via a otg connector and it didn't charge. I could get a USB C to micro adapter, but I have other cords that are USB A on one side and proprietary on the other side. If a otg didn't work, what kind of adapter can I use to plug an old cord into my new charger? 

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