Wanted: your ideas for a 2.0 v.d.c. 1-amp PSU

[Skywave]

I've come to a full stop on this. First, I tried the cct. with the power Darlington - and found that the output voltage was the same as the input voltage and zero regulation. So, suspecting that the (new) Darlington was defective, re-wired the cct. to the basic LM317 mode - as per post #2. Set output voltage to 2v and connected a 100-ohm load. Output voltage fell to 1.3v: regulation non-existent. This was with 7.5v d.c. from the reservoir capacitor, 20,000 uF. So, next: replaced that voltage source with +15v from my bench regulated source (good for 2 amps) and used the same basic LM317 regulator cct. Same result: no regulation. So, suspecting a defective LM317, replaced it: same result. Replaced the LM317 again: same result.

Can I really have a batch of defective LM317 regulators? I don't understand what's going on here.

(For the purpose of this post, please ignore my 'signature' as below! )

Al.