Led Pop Blues

[richon]

Finnally, after finishing another pedal (more than 100 on my list) i came across a LED NIGHTMARE

without the led conected, normal swithching pedal without any pop, as usual in all my other pedals

now:  when the led is conected, POP!! clear and loud..

tried a lot of things, even the AMZ filtering 9V with resistors and cap to limitate the current draw...  no luck, it was even the same after all the mods...


any ideas what to do now?