In the above circuit used as level shifter, I would like to know if
- Changing all Resistances by a factor of 10 would still give the same result. The reason I'd like to increase the resistances is to make sure that a minimal amount of current actually flows.
- If R1 is really needed.
Any other level shifter which is more efficient using transistors/cap/res? I unfortunately am not from this background, so circuits using MOSFET goes over my head. However if some description is given, I'll be grateful.