Current adjustment circuit seems to skip resistors?
Your circuit can't work well.   It's &quot;open loop&quot;, meaning the input (your control) has no knowledge of what the output is doing.   You need feedback for this to work well.  (Well, it has a little feedback, but not very strong)  It won't hold a constant current very well and it certainly won't be repeatable w/o tweaking if you're making more than one.
To feed your brain a little, you might try working with something simple like this:

The idea here is you set R sense such that there's 0.7V across it when you're driving the amount of current you want.  R load is your LED.  So that's the 'feedback' here... Q2 throttles Q1's base current to ensure a constant voltage on R sense.  It does this because the voltage on R sense has to be same as Q2's base-emitter voltage (~0.7V)
i.e.  If you want 200mA, you would set Rsense = 0.7/0.2 = 3.5 ohms