Sunking squeal problem

[Ward]

Hi, I just finished the Sunking, every thing seems to work as it should except if I turn the gain pot all the way off it squeals like a pig, if I turn the pot up to maybe 1 it stops squealing. I am using the Max 1044 CPA, not sure if it could be the chip, why the squeal only when the gain pot is off?
EDIT: brff, far out, I just noticed that it does it even with the pedal off.

Edit 2: The racket occurs when I touch gain 1 lugs 1 and 2 together which is the same as having the pot full off if that helps anyone, that's the best I can do.

[jkokura]

Using a CPA chip will cause squeal. I haven't seen it work with one yet.

You need to use a SCPA charge pump. The 7660SCPA, TC1044SCPA, and the MAX1044SCPA are all possible options.

Jacob

[Ward]

Rightio mate, thanks, I'll have to hunt one down.

[gtr2]

Maybe we can put in the build docs that the CPA will not work with bold letters.   

[Ward]

So I ordered the ICL7660 SCPA and received ICL7660 CPA. I put it in and now I can have the gain pot off without the squeal but there is a faint high pitch oscillation and the thing is a box of snakes, the hiss is ridiculous with gain off, vol and tone at noon. So did I get the wrong chip yet again and with the correct chip will the hiss return to acceptable levels considering I have it set as a small amount of clean boost?

[jkokura]

Yes, you received the wrong chip again.

I don't know if the problems will go away, you have to try with the right chip. If you still have problems then, we can help you.

Jacob

[bigmufffuzzwizz]

Where are you ordering your chips from?

[sprayfe]

Yeah man, if you need me to pick you up a few legit chips from mouser, I can send ya some.

[bigmufffuzzwizz]

i had the opposite experience. i ordered from futurlec, the site said cpa and i got scpa. id like to know the place that did this to avoid it.

[Ward]

Hey guys, I've been getting them off ebay, there's not a lot out there on the bay, actually I think I'm really kidding myself looking on ebay. The last lot I got, I got two, they were listed as SCPA and they get here and they're CPA. I had a look at Mouser, $1.50 each, ( I paid $20 for two shipped to Australia from ebay member "Littlediode Ltd" from the UK, they did refund me though so that's something) but Mouser wants $42 shipping, forget that.

Yeah man, if you need me to pick you up a few legit chips from mouser, I can send ya some.

Man that would be great if you could get me say 5 and post them over to Australia via 1st class int mail, please pm me if you are ok with that and give me your paypal addy and a price, I'm more than happy to add a few bucks for your trouble. Cheers, Nic.

[bigmufffuzzwizz]

Ive offered to do that before too and if anyone ever needs it just ask. I would never pay 40 dollars shipping for a few chips and theirs no reason you should either.

[Ward]

Ive offered to do that before too and if anyone ever needs it just ask. I would never pay 40 dollars shipping for a few chips and theirs no reason you should either.

Thanks mate, we'll see how I go. I must say, even with all the hiss, as a clean boost this is the best pedal ever, really stays true to the amp's thing. At the moment I'm using IN914 clippers as well.

[Ward]

Just an update, thanks to sprayfe and bigmufffuzzwizz for the offer to send me over a chip or two however I am trying one last time with ebay, they are priced well and I ordered 6 so we'll see if I finally get the right ones. They are coming from good ol China I emailed and he? reckons he has what I need. Thanks again.