Location of voltage-dropping power resistor

[lineup]

If I have a bit access ripple to reduce
I could in this case use one C-R-C before reg
with
470uF- 10 Ohm - 470 uF
.. and I would not bother one bit, if there is 12 or 5 V across the regulator (LM317)
Problem is when we have not enough voltage across this IC

Actually, I am quite sure, some parameters for the LM317
can get better with more Voltage!

[hollowman]

Originally posted by infinia
You wouldn't keep having this problem (High V overhead) if you specified the right transformer to begin with. Before buying your transformer parts I suggest you post here first. We can help you with sizing the turns ratio. Then you would not need complicated "cling on" solutions after the fact.

In the main post I did note that I'm using a "slightly 'larger' transformer (voltage wise) than that need for an application". But I agree with you. The transf. used -- Amveco 62024 -- was recycled from another project.

Yes the measurements hollowman gives seem wonky here, also in the previous thread for a similar issue. Maybe he mixes loaded and unloaded V for a small transformer.

Maybe this will clarify some things:
Before the reg. (and as stated earlier), I have two in-series green LEDs (I assume 20mA and 2V drop each). With these, I have V ("unloaded", at reg input) = 32.5v. Loaded, V (at reg input) = 27v.
I forgot to note a red (on indicator) LED across the load (with its current limiting 2.2K R in series). So that's 20mA plus the orig 25-40mA load.

A partial schematic of the ckt is here.