DC 5V to DC 9V USB Voltage Step Up Converter Cable, Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless Router, Speakers and More Devices

So happy and impressed. I bought a new LED Projector from Amazon https://www.amazon.com/gp/product/B07JH74N32/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 This is a 12v projector with an internal battery, but the battery only lasts a little more than an hour, not long enough for a full movie. I bought this USB to 12v dc adapter to power the projector rather than using the wall plug. My expectation was that either it would not provide enough amps, or just enough to more slowly drain the projector battery so maybe I could get 90 or 120 minutes out of the projector battery. To my surprise, this usb adapter not only provided enough energy to power the projector, it also topped off the internal battery charge! Far exceeds my expectations! I put a USB voltage checker on the input, it was taking between 1.75-1.95A of 5.06V from my usb external battery (the kind you use to charge a phone) This will make my projector so much more used, as I use it outside on camping and boating trips.

Yes, this will produce 12V from your power brick. Will your device work? Maybe. 12V often suggests more power. If you have a small power brick it may not be able to produce the power you need for your device. You may want to consider a power brick that can produce 2 or more amps (2A). There's some math to figuring out how much power you need, but a good 2A power brick will work for many things. There's no free lunch here, 12V devices usually want more power, a tiny power brick won't do that. So, if you have a good strong power brick, this thing will definitely do the trick. It gets a bit warm but has not failed me. A power brick will usually just shut off to protect itself from burning up (a good thing). You'll know if you're using more power than you have if your power brick shuts off every time you plug this in.

These are great, now I can take advantage of the large number of USB power supplies out there for powering 5V stuff. But do note how many amps you need, since most are only rated for 500ma to 1A! At first I had trouble with this, but the gear I was testing it with (which came with a 3A brick when new) needed at least 2A to be happy, and the regular 1A USB power supplies were simply shutting down. I found two rated for 2A, and even one of those didn't always work. That's okay, since I plan to use it with an extension cord that has a pair of USB plugs rated for 3.6A total. As a bonus, it had a velcro strap built in, a rare case when the item is better than pictured. It may just be the particular lot that the seller got, but I'm happy not to have to add one on my own.

These can make a decent, compact and inexpensive substitute for those $100 rechargeable pedal board power supplies that won't fit under your board anyway! I don't know what most folks would use these for, but I wanted a couple to test for powering (bass) guitar effects pedals so I wouldn't have to haul cords around and try to find extra AC outlets. The voltage is accurate on these but they are the wrong polarity for effects pedals. It's simple enough to cut the cord reverse the wires, and solder back up with shrink tube insulation. You can't even tell. Plus I removed most of the length of cable at the same time, as the most I would need would be 6-8". I also soldered 2 additional plugs on in a "Y" configuration so I power 3 pedals from each one of these. Could have powered 4 or 5 or more (depends on power draw of the particular effect) but I wanted to draw no more than 50% of rated current. 2 of these cables, modified like this and plugged in to an Anker battery pack USB phone charger, which is zip tied under my pedal board, easily powers my entire effects board (of small 9v TIP NEG) pedals and still leave an unused USB port on the power bank for my phone or tablet, or gooseneck usb console light. I can go 2 solid 4 hour performances and still not kill the Anker battery pack. It DOES however take at least a day and a half to recharge the battery bank. *In conclusion, I think they would have a good thing going for the price, by simply 1) reversing the polarity and 2) package with a 3 way splitter or daisy chain with 5.5mm plugs in a tip negative polarity. Oh, and 3 rubber caps to insulate any unused plugs! Edit: since I wrote this, I added another, and powered a newly acquired SpectraDrive and my old Line 6 wireless. Seems solid, but I'd feel better with 4 instead of 3.

I use this USB adapter to charge my portable karaoke music center when we are at the off-grid cabin. It keeps the speaker charged and going all night long! We have some wild times up there thanks to this USB cable!

I was testing this 5v USB to 12V up converter with a 100 Ohm power resistor and the voltage was spot on at 12.01v before adding the 1.2Watt load testing. During the testing, I accidentally shorted the 12v output and ground through a multi-meter current meter mode which has an in-line 400mA fuse. The fuse in the multi meter DID NOT BLOW and the voltage afterward from the USB converter was no longer 12v but 5.0v or USB power input. After cycling power, the converter output voltage returned to 12v, however it dropped to 5v again during testing. This converter cannot handle 12v @ 400mA or 4.8Watts and causes a protection circuit to trip internally. I can state I did not destroy the converter as the 400mA fuse never blew and the specs state it can handle 0.6 Amps (600mA max currecn). If your equipment may have surges or will be destroyed with a 5v continuous input instead of 12v then proceed with caution.