I hope you don't mind if I suggest some changes to that schematic Ron?
The resistor R2 120 ohm should be between Out and Adj pins of the LM317, to ensure the 10mA output current.
C3 should be between Adj pin to ground to ensure stability.
No, no problem. That's how it should work. I'm a little
.
Also as a suggestion a second LM317 can be added before the voltage regulator LM317, as an adjustable current limiter(using a resistor, or some switched resistors). It can be switched out of circuit too if needed by shorting it out with a switch.
I like the idea but we would need a higher bulk supply (transformer) to support the 20 volts at low line i think.
But we could look for a 24 volt transformer.
The 5 volt supply is another nice touch. I have that on my supply. If you would like that just add a 7405 like the 7412 is shown. Let us know if you like the adjustable current limit and we can look for a different transformer.
Here is the new schematic.