Aquaboy MN3005 failed

[r4ndy]

I have an older Aquaboy (red pcb from FSB buy) that worked fine when I built it, when I recently plugged it into my voodoo labs power supply it would not get any delay - the only thing that happened moving any of the knobs was a very slight whine when cranking up one of the pots (I think it was the feedback pot).

I pulled the pedal off the board and plugged it into a one spot, same thing. Tweaking all the trimpots had no effect. I then swapped out the MN3005 with another one and got delay, I then tried a few more chips and they all worked fine.

It dawned on me I had the voodoo labs power supply set for an original Boss DM-3 at 12V. I thought the increased voltage might have caused the failure, but what I have seen in other threads suggest I should be able to run the Aquaboy at 15V, so I am thinking 12V should be fine.

Could the 12V have friednthe chip? If it was not the voltage any suggestions on how to troubleshoot to ensure I don't lose another chip?

Thanks

[jimilee]

Did you get delay in the Aquaboy from another mn3005 and not the original? Or did you take the mn3005 out of the Aquaboy and put it in another build?

[r4ndy]

I put 4 other MN3005 in the Aquaboy and all work, but the original one I had in the pedal will not work. I don't have another BBD based delay to test in.

[Scruffie]

Sounds pretty dead to me 

The 3005 can handle 15V MAX so 12 is within the limits.

They are static sensitive parts though.

[r4ndy]

The pedal worked before I boxed it up, I doubt it was static related, but it is possible.

Could someone help a paint by numbers builder with where I would measure input to the MN3005 to ensure my voltage is not going north of 15V for some odd reason.

[Scruffie]

The pedal worked before I boxed it up, I doubt it was static related, but it is possible.

Could someone help a paint by numbers builder with where I would measure input to the MN3005 to ensure my voltage is not going north of 15V for some odd reason.

Just measure all 8 pins of the MN3005 and list the voltages, should tell us a lot.

Maybe you got a voltage spike out of your supply somehow, that'd kill it.

[r4ndy]

Thanks Scruffie - I will check it out.