1776 Multiplex Delay debug/help

Forum dedicated to helping people debug and troubleshoot non-functional pedals or builds. Please use an clear and informative title, indicating circuit and basic problem. Don't forget to mark the issue as fixed if this is the case.
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registracii
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Joined: 08 May 2012, 10:13
Location: Ireland
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Post by registracii »

hi guys,

I am building a 1776 Multiplex Delay... quite big build, but believe me its worth the effort.
The pedal sounds really good, definitely all I would ever need from a delay pedal.

Now when it works it's great. My problem is that after couple of minutes it goes into screaming frenzy, which seams to be coming from the "second head" delay chip... at least it is effected only by the knob that is controlling the speed of 2nd head.It;s triggered by higher signal on the input - like hitting the strings really hard, if I keep the volume of the guitar low it's fine. once it starts it just goes berserk until the power is cut. if I don't leave it alone for some time it's just starts the noise generation again when turned on.
is that a bad capacitor? where should I start looking into...and any help and advice will be greatly appreciated.

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