Isosceles Boost - Feedback issue... only when both top potentiometers are turned fully counterclockwise and the left switch is up

[Abyssmal]

Isosceles Boost

Isosceles Boost - PedalPCB.com

The Isosceles Boost combines two popular "metal" boosts and a classic preamp into one compact pedal.

www.pedalpcb.com

There is a very intense feedback only if both top potentiometers are turned fully counterclockwise and the left switch is up.
Besides that it's all fine....
Any ideas?

Everything besides hardware is from digikey, including the TC1044
Maybe i should check the TL071 i think it's from Ebay...
All the elect. caps are 50v


Thanks

 

[Danbieranowski]

This is the second one of these with a TC1044 from Digikey that is having this issue. I’ve built two with 1044s from Tayda without issues so I’m thinking Digikey’s 1044s aren’t playing nice. @PedalPCB mentioned in the other thread that this has been known to be caused by bad 1044 chips.

 

[Abyssmal]

This is the second one of these with a TC1044 from Digikey that is having this issue. I’ve built two with 1044s from Tayda without issues so I’m thinking Digikey’s 1044s aren’t playing nice. @PedalPCB mentioned in the other thread that this has been known to be caused by bad 1044 chips.

whoa okay, first time i hear about digikey bad component, i'll try the tayda ones... Thanks!

 

[Nostradoomus]

A bad 1044 will make this whine

 

[Abyssmal]

A bad 1044 will make this whine

Issue on mine is not high pitch like this, it's lower, i'd say around 2-5khz

 

[falzhobel]

whoa okay, first time i hear about digikey bad component, i'll try the tayda ones... Thanks!

Same here. Had trouble with a "bad" mouser batch.