I am using a Bluetooth module (RN-41 SM) that is spec'd to run at 3.3(V).
I can operate this module at 5(V) however, due to another part of the circuit, I need to run the micro controller at 5(V)
The issue I have is that the only rail I have available is a 5(V) rail. My idea was to use a 3.3(V) zener diode and buffer it through an emitter follower, however when I tried this, it failed on me. I have to supply at max 100 mA to the circuit.
I am using a garden variety transistor (2N3904).
I think my issue may have been related to biasing the transistor properly. Could anyone guide me on how to bias a circuit like this or suggest any other method I could use to supply the 3.3 (V) rail.
Thank you for your time.