"WHAMMY" Pass DIY headphone amp guide

[PC997]

New try on mostly SMD Whammy.
First testrun finished successfully.
No burning components till now 🙂
Final wiring required to test the sound.
No OP amp rolling possible I have settled on AR823.
Hopefully this was not a mistake.
Testet in my old Whammy with OPA 2604 but wasn`t much impressed.

Some tested the AR823 in the whammy results sound not so bad.

This is incredible. Love it.

 

[Danger Mouse]

Thanks a lot.
I also like it in its own way.

Maybe do you mean the AD823 which is a JFET input, dual opamp from Analog Devices?

Google finds no opamps called AR823 ...

Yes you are right. AD823. Typical typo.

 

[thomasnadeau]

Wayne's has 100 Ohms

I have an uncontrollable addiction to diyaudio.
Hahahahahaha

Edit: It's now 1:25am

Last night I went to bed at 5:35am.
Hahahaha

One suggestion for your circuit if you create a PCB from it, is to clearly mark the chassis/ground earth versus the circuit ground. The Glassware Audio board is very confusing as it calls one "house-grnd" and the other the ground symbol so I had to look at it 4 times just to make sure I was hooking it up properly!

 

[2 picoDumbs]

Being quite dumb myself, I am reasonably expert in making things idiot proof.
Hahahaha

 

[2 picoDumbs]

This arrived today.

 

[WalterW]

Looks expensive 🙂

 

[2 picoDumbs]

Got it at a very good price.
Hahahaha

 

[thomasnadeau]

Its hard to see from the package, but did you go with the classic or vivid? Interested in hearing about your listening and/or testing experiences with these.

 

[2 picoDumbs]

It's the classic.
I had already informed them which one I was interested in before other people said what they liked.

I have a few other opamps to compare with though, so it will be fun.

 

[fvzeppelin]

Just a short question:
I have built a Whammy like in the first posts of this thread without any extras. I am using the LED supply version.
I was very suprised to see that the supply rails had exactly the same absolute value of 16.85V. This is just luck, right?

 

[6L6]

It reflects the skill of the builder. Well done!! 🙂

 

[fvzeppelin]

It reflects the skill of the builder. Well done!! 🙂

Hahahahaha, yeah, sure, it took me hours and hours to find exactly matching regulator/LED combinations

 

[thomasnadeau]

What would be interesting to understand is at which point does the difference make any audibly noticeable difference?

--Tom

 

[2 picoDumbs]

When one rail is less than 10V above the output voltage.

Eg If you swing 3V pk and one rail was 12V while the other was 17V, that would be audible, if not audible, then at least measurably worse.

 

[6L6]

What would be interesting to understand is at which point does the difference make any audibly noticeable difference?

0.003457% of not much.

 

[wayne]

Just a short question:
I have built a Whammy like in the first posts of this thread without any extras. I am using the LED supply version.
I was very suprised to see that the supply rails had exactly the same absolute value of 16.85V. This is just luck, right?

I would like to think brilliant design but that would be wrong.😀

 

[Zen Mod]

one of (well deserved) things they learn first in PL - to get rid of unnecessary Modesty

 

[Audiobear]

LOL

So that's what the inside of Pass Labs looks like. I always wondered.

 

[Zen Mod]

nope

that's Wayne's personal Cockpit, he's flying like that to PL

🙂

 

[2 picoDumbs]

one of (well deserved) things they learn first in PL - to get rid of unnecessary Modesty

Where do you get these photos.

Hahahaha