That also begs the question about how to ensure that I buy the right jack when designing something that NEEDS wall wart power. So.that leaves me with a bunch of power supplies that don't fit their devices, and me a little peeved that I have to deal with RMAs, return shipping, etc., especially when I really don't have a clue how to figure out what to order. As you may surmise, I'm not a big fan of trusting my local Radio Shack for electronics guidance. If I try to pump them for information about what the outer and inner diameters are, they want to know if I'm happy with my current cellular provider. Too many parts to misplace and the tip-to-cable connector is almost always proprietary. Personally, I think that these types of "universal" kits are the worst thing to happen to electronics in, like, FOREVER. Radio Shack has their little keyring behind the counter with every known tip size, but all they can get from that is which stock number fits on their universal wall wart. How do I prevent this from happening in the future? Do they even make calipers that can get into the hole to measure the pin diameter? I ordered the power supplies I needed based on outside diameter (e.g., 5.5mm in my example below) and was surprised to discover that while the jack fit, the center pin did NOT. They're all the typical barrel power connector, and I'm having a dickens of a time trying to figure out the pin/hole diameter. Spring cleaning, and I'm trying to get power supplies for all my devices with missing power supplies.
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