USB DC 5V to DC 9V Voltage Power Supply Cable - USB to 9V Cable with DC Jack 5.5 x 2.1mm, Tip Negative(-) Design, Max DC-5V-to-9V

Works perfectly for connecting 9 volt center-negative effect pedals to a rechargeable power bank or USB phone charger. I keep one in my bag for gigs, as a pedal power backup solution. Compact and ultralight just-in-case insurance.

Works perfectly with a Samsung USB wall adapter to power a Strymon Cloudburst. It's center-negative so it works with most pedals right out of the box (bag); no polarity conversion required. Doesn't feel flimsy, but I wouldn't go yanking it out by the cable. Might not last as long if installed where its constantly being jostled. There are less expensive adapters that look identical, but most I saw were center-positive, and I was willing to pay ~$4 more to avoid the inconvenience of either using a polarity converter or re-soldering the leads. Make sure your USB power source has enough amps on the 5V side for the 9V power draw (roughly twice what you need on the 9V side).

Didn’t work. Killed two power banks.

I use a battery brick to power my overdrive pedal. Works great!

USB DC 5V to DC 9V Voltage Power Supply Cable - with DC Jack 5.5 x 2.1mm, Tip Negative(-) Using it to run 9V guitar FX pedal from USB port on power supply.

Like others, I bought this transformer to power a small pedal board from a phone charger. It provides a steady 9.6 volts from a 5v supply, and works well in this role. But the plug, while center negative, is not compatible with guitar pedals. It's a simple operation to splice on the correct plug, but mind the polarity.

Awesome for running guitar pedals no noise great price fast shipping

My little pedaboard was aways powered by a 1-Spot. Now, a phone power bank and this voltage converting USB cable are doing the job perfectly. I think the key is that one of my pedals is a Zoom multi-stomp (MS-70CDR) that is always drawing enough current that the phone power bank never shuts off.

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Was terrific for converting battery powered fan to USB.

Amazing! works perfect..NO more batteries.

Does exactly what it says

AVOID! I used the usb with an appropriate 9v device, with positive polarity. I purposely chose a plug with slow speed, not to over exert the usb etc. Within minutes I began smelling a strong burning smell, the usb was hot to the touch and I had to take it outside. I would consider the item dangerous.