iGreely USB to DC 5V to 12V Voltage Step Up Converter Cable - 3ft/1m, DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, USB Charger

Nice units, They don't feel like they will fall apart anytime soon as some alternative devices I looked at reviews of are reported to. The 5.5 2.1 to 2.5 plug adapter is a nicely made unit too and in my head it's worth a £1 or 2 on its own ! I bought 4 of these so I hope that counts as a reasonable sample to test. I did see a small variation in maximum power output between them on test but nothing too bad. Looking at the figures for the 'least powerful' of them (obviously others test methods and results may vary etc etc ) they produced about 9.25Volts (highest 9.35) without load and all stayed above 9V as the load was applied and increased to 0.5A After that I saw 8.4V (still fine for many 9V devices) with 0.6A drawn and then down to 7.3 V with 0.73A drawn. For the very best of my 4 units the final result was 7.7V with 0.78A drawn (with 5.08V @ 1.48A going in) I didn't take it further but I did leave the least powerful one delivering 0.73A for 3 minutes with no significant noise or heat building in that time. So this works well for producing 9V up to around 0.5A (500mA) and with a good bit left in reserve for heavy initial current in lights /chargers etc. For what they are and the excellent price I'd say these are a useful problem solver for things like device chargoing in the car etc

This device works well so far. I've only briefly tested it with four 12v fans with a current draw of 0.08A each. They're pulling a total of 0.37A consistently when powered using this cable and a OnePlus fast charger which can provide up to 5A. Will report back when I've tested it using different power supplies. Listing says it needs a minimum of 2A to even work so I'll see if that's true. It does get noticeably warm in my use case but so far doesn't seem to be overheating when given sufficient power, some heat dissipation is normal given the job its doing. Connector seems stable, cable seems fit for purpose. I don't think this circuit is a difficult one to manufacture but to get a reliable one that doesn't overheat, ya do have to spend a few more quid. Avoid getting those 10 x boost converter module packs as they tend to overheat massively and can output very little current. Would recommend this cable so far!

I work with network equipment and often have to use small Netgear switches or media converters in racks or whilst moving about. There are often no mains sockets available. This lets me power the switch or media converter from my laptop, or even a convenient USB port on the equipment itself, like on most Cisco gear. You do need to check it won't pull too much current, but it's fine for most reasonable use cases. Robust enough as well. Maybe my only complaint is the electronics are all in the plug, which is quite deep. This sometimes means you can plug it or leave it plugged in with limited space. If it was in a blob on the middle of the cable, you could do this. I tried another type of this cable before and it was not nearly as robust or stable.

Great item when you need a 9V supply without using or buying a bulky mains adapter. Simply plug into an available USB port or into a powerbank and away you go. The cable is nicely flexible.

worked well - now run an outside controller off a USB (PD) battery instead of Mains adapter - much better.

The usb broke within a few weeks complete rubbish quality

Igreely need to sort there advertising out. I bought a 5v - 9v lead, which lasted a year before falling to bits, but worked well until then. Buying another, their 9v lead shows pics of a 12v lead. Get the right pics up to save confusion!

I bought this so I can run a reversing camera off a USB socket in van dashboard

Ottimo , qualità dei materiali buona . Lo consiglio

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🔌 Compact USB to 12V Boost Converter – Works Perfectly! I’ve been using this iGreely USB to 12V voltage booster for about a week since it arrived from Amazon, and it has worked exactly as advertised. The 3-foot cable feels sturdy, and the DC connector fits securely without wobbling. It delivers a stable 12V output from any 5V USB port, which is super convenient for powering small devices on the go. Simple, reliable, and great for everyday electronics needs.

I purchased this thing to power a guitar pedal from the USB jack on my rechargeable PA speaker which I use as a Bass amp. The fist thing I did when it arrived was plug it in and test the output with my scope meter. It puts out a very flat 9v DC. The output tends to be 1/4v high or low, which I would say is within tolerance. The downside is that, even though the plug is the right size for guitar pedals, the polarity of the plug is backwards and the "adapter" that is included doesn't do anything - it doesn't change the size or the polarity. It would have made sense to include a polarity-reversing adapter, but no, I had to use polarity reversal plug that I happened to have on hand (the red adapter in the photo). Once I got the polarity figured out, I was pleasantly surprised at how well this thing powers my fuzz & octave pedals. There is a bit of RF noise, which I mostly solved by slipping a ferrite bead over the power cord and one over the guitar cord.

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