Whine Sound In Digital Pedal After My Klone

joelorigo

joelorigo

Well-known member
I have a TC Electronic Quintessence that I am getting a whine sound when activated if I have it after my Aion FX Refractor (Klon).

I first had both pedals in a daisy chain power supply with some others the I noticed it. Then I gave the Quintessence its own supply and the noise. Then I tired the Quintessence by itself and no noise. Then I tried added another OD pedal in front if it and no noise. Then I tried it with the Aion and it is there.

Anyone know why this would be happening and if there is something I could do about it?

Here is the documents for the Aion pedal. I have it wired with the buffered bypass option.
 
This maybe the cause, Do you have a TC1044SCPA in the Aion refractor. I am not a Fan!
You could try a 7660SCPAZ, that's the only one I use.
What happens if the Aion is after Quintessence?
 
It does have a TC1044SCPA in IC 3. I see the doc says a LT1054 has "better specs."

I will try it after the Quintessence.

EDIT: No noise with Aion after Quintessence
 
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joelorigo said:
It does have a TC1044SCPA in IC 3. I see the doc says a LT1054 has "better specs."

I will try it after the Quintessence.

EDIT: No noise with Aion after Quintessence
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Try and get hold of the 7660SCPAZ, it is a direct replacement & what the Klon uses.
With the LT1054, you have to cut the link between Pins 1 & 8 of the PCB or remove solder if jumper pad installed!
 
Also, can the 7660SCPAZ replace the TC1044SCPA in any pedal? Pretty sure I have this in my Rullywow Queen of Bone.
 
music6000 said:
Yes.
Be aware that DSP type pedals are prone to have issues with Pedals with Charge pumps.
Strymon is another known pedal to have issues.
Click to expand...
Do you know if putting the DSP pedals in an FX loop and the charge pump pedal in in front have the same issues?
 
I received some 7660SCPAZ chips today. Replaced the TC1044SCPA with one of them in the Aion. No more whine sound when the Quintessence is turned on!

Thanks for the tip about these chips! I guess I will use a 7660SCPAZ when a TC1044SCPA is required from now on.
 
How are you powering all the pedals? One poorly isolated supply is enough to create a ground loop. Edit: and it can affect any pedal at any point in the chain, regardless of where the supply is. Electromagnetism is a b$&@!
 
giovanni said:
How are you powering all the pedals? One poorly isolated supply is enough to create a ground loop. Edit: and it can affect any pedal at any point in the chain, regardless of where the supply is. Electromagnetism is a b$&@!
Click to expand...
I tried various power sources originally. The constant was the sound when the Quintessence was turned on after the Aion pedal. When I changed the chip yesterday, and the sound was wasn't there anymore, they were on the same daisy chain power source. So it seems it was the TC1044SCPA in this particular situation.
 
For anyone following this and anyone coming across this in the future:
I have replaced the TC1044SCPA in my Queen of Bone 2 and the just completed Betty Boost with the Intersil 7660SCPAZ. In both cased the Quintessence made some sort of whine sound with the TC1044SCPA in them and not with the 7660SCPAZ installed.
 
im currently working on a bass rat with optional opamp boost/high gain mode. im using a tc1044 as a charge pump to run everything at 18v.

The problem im running into is im getting a squealing noise with the boost turned up.

I tried a separate pedal - an lpb1 in front of the rat circuit and it sounded great. lots of gain no squeal at all.

Ive been dialing down the gain in the boost and the rat because I thought it was just getting to much gain but that doesn't seem to be the case based on the experiment above.

anyway all that being said. Is it possible this charge pump is causing this issue? or should I look somewhere else?
 

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joelorigo said:
I am getting a whine sound when activated
Click to expand...

An IMPORTANT point regarding eliminating whine due to charge pumps:
When a charge pump is giving you a whine, make sure that you are using good quality (low ESR) capacitors for the capacitors used by the chip as part of its charge pump charging action. For a TC1044, those caps are typically 10µF. If those caps are cheap (or you have a bad solder joint on one of them) and thus you have a lot of inline resistance, you're going to get the whine regardless of the charge pump chip you use - i.e., TC1044/TC1054/ICL7660.

I have personally had the experience where changing the charge pump chip to a better chip had little impact on the whine, but swapping out those caps for low ESR caps has completely solved my problem.
 
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