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Obvs check they are centre neg - not all of them say...
The Hincore one is out of stock
DV247 do one Fame EVC-1 Power Converter USB to 9V favorable buying at our shop (dv247.com)
I can solder but how do I drop the voltage to avoid cooking a usb device plugged into the female connector ?
This will work fine from 7V to 15V
Use a TO-220 package 7805 regulator. The heat created will be the voltage drop X the current drawn so 4V X whatever the current draw will be.
The problem with doing it the way you want is that a pedalboard power supply usually won't be able to provide anywhere near the current required by some USB devices. Depending on your power supply, it could be as low as 9V @ 100mA, or 5V @ 180mA, whereas even the USB 2.0 spec allows devices to draw up to 5V/500mA.
Wireless devices can be notoriously power-hungry, so...exactly what are you trying to power? They also often introduce a lot of noise into the power supply, so you'd need a properly-isolated supply for it to be usable.
Internally the regulator does operate as a voltage divider but it uses a transistor as a constantly active variable resistor to keep the voltage balanced with the load.
You can omit the LED and it's resistor leaving you with one regulator and 2 caps.
Or you can get a small PCB board that uses a buck convertor, these tend to have the USB socket on them already but may inject a bit of noise into the mix so I generally use linear regulators for small current draws.
If you want one of those then
https://www.ebay.co.uk/itm/193727621572
Remember to get the pos and neg the right way round on the input, either cut and cross over the cables or get a cable already reversed on end to negate the dumb pedal power being neg centre
https://www.aliexpress.com/item/1005004946006873.html
the small usb component in the listing - effectively a wireless mini usb host that needs power but doesn’t power device it is attached to
just want a neat solution - I can’t imagine the current draw will be excessive .
I do have a virtual battery n also a voodoo lab ps with a sag feature but ideally want to power everything from a strymon zuma