Task about BJT Led
To set up the LED driver. The requirements are:
The current through the LED should be 20mA ± 1mA
The IC/IB should be around 25
I find: RB=43000 ohm, and Rc=180ohm , that meet the requirements, so, the LED driver works properly.
I have a couple questions if someone can give some help!
_Which area it uses and which area can be used to vary the brightness if needed.
_ What are the values VCE, VBE
_What kind of amplifier this is and how the transistor β affects RB. (VOLUNTARY)