Noisy Klon

[zipfool]

I'm sure I've brought this on myself 

I bought a Klon kit from General Guitar Gadgets and decided I don't like the enclosure they sent. So I bought a [nicely powder-coated] enclosure from Landtone. Everything from the GGG kit fits in this new enclosure and everything sounds good when it's wired up.

But, there's a constant and very high pitched noise coming from the pedal when I have it switched on. I suppose it might still be there when I'm in bypass, but it's hard to tell. When the pedal is on, this noise gets louder/softer when I turn up any of the pots. It's only slightly quieter if I use a 9V battery instead of my rather questionable power supply.

There's one photo at the bottom of the post, but here are some more:
https://photos.app.goo.gl/DtC5mVvvV7iDPchY8

I built this with all the components that GGG sent me, except I swapped one of the caps out as a tone mod (C14 - 6.8nF). Before wiring this to the assembly, I reflowed all the joints on the PCB (see my other thread called "Klon Rat's Nest from Hell"). Last time I checked, all the voltage checks out across all IC legs.

I'm happy to record the high pitched noise, but it just sounds like a very high pitch feedback noise.
I'm also happy to try anything to diagnose or poke around some more. When I poke around the board, everything is pretty solid and nothing sounds like it's shorting out.

[iainpunk]

im not to familiar with the charge pump, but it might be what's causing the noise.

cheers, Iain

[idy]

The 7660 charge pumps often give troublesome whine. The LT1054 are a few dollars more but less trouble.

With them you need to make sure that pins 1 and 8 are not bridged. With the 7660 you need to bridge them to "boost" the frequency safely into the ultrasonic. If this is not bridged you can do it with a bit of wire. If you replace with 1054 you would need to bend pin 1 out of the way.

[aefpv]

I built this pedal too from GGG.  I had the same trouble.  I had to get a different charge pump and the problem was solved.  I got the TC1044 SPCA and the Max 1044 CPA.  If my memory is correct, both worked well. 

[zipfool]

I hadn't considered that the ICs could be the issue. I'll give your suggestions a try this weekend if I've got any of those laying around in my kit.
Thanks!

[stallik]

Hmm. I had to use a 1054 to quieten mine down. I'm sure that pins 1&8 are connected on the board - perhaps not? Must check later.

[r080]

From the pictures of the board on JD's site, it looks like they are. However, it is a single sided board, and should not be too hard to cut, or do what IDY suggested.

[stallik]

I'm using a fuzz dog board - still haven't checked it..

[zipfool]

Thanks everyone! I tried a TC1044 SPCA and it works great now. No noise other than my poor pickwork 😀!