big muff "discombobulates" Behringer Delay

[MarcoMike]

ok, here it is, today I was playing with my band, kick the BM on and also the delay turns on.... 

analysing the problem (as a scientist  ) it turned out that when the level is "too" high the DD resets and turns on (as it does when you plug the power plug)

the only two pedals which do this are the BM and the SHO, which are probably the loudest on my pedalboard. the delay is powered by a regulated 9.5V supply, while the BM and SHO are powered by a 9V reg. supply.

is it something common, did it ever happened to any of you? is there a simple solution or should I just live with it?

I tried using a higher voltage supply for the DD to give it more "headroom", but it just get crazy at 12V

[Paul Perry (Frostwave)]

Back to back zeners across the output of the BM & the SHO?
or (better) across the input to the DD. That's what I'd try. Say 8v zeners.

[MarcoMike]

mh... this is not a bad idea at all!

thank you, I will give it a try!

[Rodgre]

This sort of thing happens occasionally with Line 6 pedals as well. The Distortion Modeler will always reset itself and bypass with heavy downbeats. Makes it useless for live use, but my DL4 and MM4 have only done it when playing an outdoor show with power run from extension cords from a house.

Roger

[Paul Perry (Frostwave)]

I had an experimental prototype that used to "lock up" (that is, go silent for an indeterminate period) on loud signals occasionally.
I believe that what was happening, was that one of the op amp sections was going into "latch up", due to one of the op amp inputs momentarily going out of allowable range.
Some op amps are prone to this, some aren't.