9v DC to 5v usb cable?

[Gank Bass]

Looking to fit a usb port to the side of my pedal board for phone charging etc but all the cables I see online seem to be 5v to 9v.  I'm not the best with electronics so I'm starting to think such a thing doesn't exist? Any ideas welcome 

[nekomatic]

Assuming you don’t want to solder anything, something like this ought to be suitable. It may say 12 volt input but the small print says it works down to 8 volts. 
 

Be aware though that if you plug in a phone that draws 3 amps from the USB port, that gadget will need about 1.7 amps from the 9 volt supply, which would be quite a lot for a pedal. I couldn’t quickly find a similar item with a lower maximum output. 

[Gank Bass]

Hi Neko, looks like at least the concept exists! I will keep searching for something more plug and play

[Hellzero]

I guess you're looking for a simple cable like this?

 

https://www.amazon.co.uk/XMSJSIY-5521-Step-Down-Converter-Extension/dp/B0DCNG2FWH

 

[Hellzero]

Or something like this to put inside a pedalboard?

 

https://www.tehonline.co.uk/products/dc-9-36v-to-5v-3a-dual-usb-power-supply-charger-step-down-converter

 

[pantherairsoft]

A simple solution, be it one with a high upfront cost, could be to replace your existing power supply with one that already has a USB charge port on it, such as the CIOKS DC7. Though it's pricey, you could sell whatever you existing supply is to claw back some funds, and the CIOKS is pretty amazing - a worthwhile investment. At least with this approach you know that it was designed for that application and you're not putting any strain on the supply, or injecting noise etc. into the signal chain.