Objective Development Forums

https://github.com/obdev/v-usb/blob/master/circuits/with-vreg.sch
I want to modify this circuit so that my MCU is powered by 5v regulator in my development board and usb signals are send in 3.3v logic level can this be done or not
I am using 117a-33ge voltage regulator

Hello.

If your processor is to be powered at 5 volts, you will need to reduce/limit the usb D+ and D- signals to 3.x volts which is usually done by inserting two 3.6volt zeners across those lines (with suitable resistors).

Does that answer your question?

Cheers,

Ross