In the Feb. 1984 (I know, old) Speaker Builder mag., there was an article on how to make a cheap and easy amp peak power LED indicator. I have one (it still works) but want to make some more for other amps I have. Has anyone updated the parts by any chance (e.g. the LM3915 is obsolete now)? I have tried to substitute new parts (an NTE 1509 for the IC) but haven't had any luck getting it to work. Thanks for any help.