We use barrel jacks a lot around here and sometimes we need to pop a switch into the mix. That usually means hacking up a perfectly good barrel jack extension cable, but the whole point of using the barrel jacks was so that we wouldn't have to hack things apart... Well, we found a solution: The Barrel Jack Power Switch.
Okay, it's nothing fancy but it *is *really useful. Plug your power supply into one end and the other into your project and, just like that, you've got a power switch! The on-off rocker switch has a good stiff 'click' to it, so it isn't easy to accidentally switch. It's also fairly small so it won't add too much unnecessary bulk to your project.
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What size barrel connector does this have?
Mine melted :( I was using it as a switch for a 3D printer, and after a few hours of printing the switch had gotten quite hot and would no longer switch on.
I have no idea how much current I ran through this thing; the 3D printer power supply is 6A but I'm not sure how much it typically uses. I'm sure this switch wasn't meant for use with 3D printers, but I've seen people suggest this kind of switch for 3D printing, so I wanted to report that this particular model is probably not suitable for that task. With the 1A supply I normally use, though, this thing had worked perfectly and is highly recommended.
I've had this switch for about 7 months on an Arduiso Uno. 12-15 cycles p/day. No problems yet.
The barrel size is actually 2.1mm. The switch is rated at 2A; it's equivalent to COM-11477 except it's a little wider. Did I say the barrel size is 2.1mm? Yep, it's 2.1mm, unless they happen to send you one that's 2.5mm.
Is there a reason you used a bigger switch than your Lamp Switch COM-11477? Is the switch used in this product available for purchase individually?
Maybe a similar thing but for a USB cable? I always find them more of a hassle than barrel jacks.
Can it handle the output from a 12V car battery or 7Ahr Battery?
Not to start a car. But for up to a few hundred mA, no problem.
is it a 2.1/5.5mm?
It is indeed. We use that size a lot! Thanks for pointing that out, I added it to the description.