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"WHAMMY" Pass DIY headphone amp guide
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Old 15th April 2019, 04:49 AM   #1341
6L6 is offline 6L6  United States
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"WHAMMY" Pass DIY headphone amp guide
Hmmmmmmm.... That's really interesting. (The recording is cool, what did you use to make it?)

Let's start where we always start, please post well-lit, in-focus photos of your build.
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Old 15th April 2019, 02:56 PM   #1342
kevinr is offline kevinr  United States
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Quote:
Now on to trying to deal with the ground hum
I ran a wire from the input ground terminal bus to chassis ground and the hum is gone.
First I ran a wire from the ALPS pot body to input ground but using a chassis ground is easier.
Input RCA inputs are isolated , ground tied together and to the Whammy Ground adjacent to the input left and right
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Old 15th April 2019, 07:30 PM   #1343
cubicincher is offline cubicincher  Germany
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Default to6l6 #1341

Hello 6L6,


looks like a recording with 'audacity'-software I also use.
But I could be wrong.



Greets
Dirk
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Old 15th April 2019, 08:53 PM   #1344
sp33ls is offline sp33ls
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Originally Posted by 6L6 View Post
Hmmmmmmm.... That's really interesting. (The recording is cool, what did you use to make it?)

Let's start where we always start, please post well-lit, in-focus photos of your build.
I'm carefully testing prior to using a chassis. So, don't judge my lack of tidiness too much, yet!

I have a .1UF WIMA between earth from my IEC and the ground of the RCA inputs, which is connected to that ground bus above the input PADs. Is this correct?

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 15th April 2019, 09:17 PM   #1345
cubicincher is offline cubicincher  Germany
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Does the OPAmp have good contact?


I don't see any solder around the legs of the OPAmp on the pics?


Go through RafaPolits test - sequence.


Greets
Dirk
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Old 15th April 2019, 09:21 PM   #1346
sp33ls is offline sp33ls
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Originally Posted by cubicincher View Post
Does the OPAmp have good contact?


I don't see any solder around the legs of the OPAmp on the pics?


Go through RafaPolits test - sequence.


Greets
Dirk
Good point. I thought about the OpAmp as being a problem. I have one of those sockets to allow for OpAmp "rolling". Are these notorious for having contact issues?
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Old 15th April 2019, 10:09 PM   #1347
6L6 is offline 6L6  United States
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"WHAMMY" Pass DIY headphone amp guide
Double check the right channel resistors near the heatsinks - as you can't read all of them in the photos.

10ohm is marked 10R0F, 100ohm marked 1000F, 10K marked 1002F
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Old 16th April 2019, 12:03 AM   #1348
sp33ls is offline sp33ls
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Originally Posted by 6L6 View Post
Double check the right channel resistors near the heatsinks - as you can't read all of them in the photos.

10ohm is marked 10R0F, 100ohm marked 1000F, 10K marked 1002F
That's a good point. I'll check those once I'm back from my work trip. I'll report back!
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Old 16th April 2019, 12:46 AM   #1349
rich1051414 is offline rich1051414
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Quote:
Originally Posted by sp33ls View Post
Good point. I thought about the OpAmp as being a problem. I have one of those sockets to allow for OpAmp "rolling". Are these notorious for having contact issues?
Only if you try to use round pins in leaf spring sockets. Other than that, they can add 'negligible' capacitance which would alter the performance, but it is minuscule.
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Old 16th April 2019, 01:12 PM   #1350
ItsAllInMyHead is offline ItsAllInMyHead
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Join Date: Mar 2019
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You've created three more DIY / WHAMMY addicts

I had a few people listen to my WHAMMY, and they wanted one. I smugly said... Well, you can build one.

Three folks came over on Saturday for the builds. Thanks to the DIYAudio team for getting the 3rd out for a last minute addition so quickly. Arrived JIT.

Three very happy campers. It took them a full day with breaks. I'm sure someone can do it in the 2-3 hours suggested, but not me

Thanks again!
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