Tonepad MXR envelope filter issue, 18v instead of 9v

[richTM]

Hello to all 

In 2006 I built the MXR envelope filter. And got it working. : )

Years ago I mistakingly put 18 Volts instead of 9 Volts into the stompbox. ; (the flanger 301 needs 18)

Now I want to revive this little friend.
Could someone please help.
What would be the first component to get dead if you plug in too much voltage?

Thank you
richard

P.S.: As you may notice. These projects are "Paintings per numbers" for me ; )
I used layout 2.0

http://www.tonepad.com/project.asp?id=4

[bluebunny]

Welcome!  You were at the limits of (or a tad beyond) the maximum supply voltage for the CMOS chips.  So I'd try replacing them if you have spares.  Nothing else will care about the extra volts.

[Mark Hammer]

15Vdc is generally as much as any CMOS chip is comfortable with.  The EF uses three of them.  Replace them all.

[duck_arse]

In 2006 I built the MXR envelope filter. And got it working. : )

this, alone, deserves a round of applause. good luck second time around.

and another welcome.

[Mark Hammer]

I bought one in 1978, owning it around the same time as I also owned a Fernandes Funky Filter ( http://www.effectsdatabase.com/model/fernandes/funkyfilter ).  The MXR was for a while my favourite envelope-controlled filter, because it was the only one in production, that I knew of, which allowed for control over the speed of sweep - something that allowed for better matching of feel to the individual song.

That has since become a more standard feature, but was uncommon for the longest time.

[Kipper4]

The other thing worth checking is the capacitor voltage rating.

[Govmnt_Lacky]

Agree with Mark and Kipper. Check for any caps that are 16V rated or lower. Replace 'em.

Also, replace all 3 chips. 18VDC is right at the max for those.