"WHAMMY" Pass DIY headphone amp guide

answer to mjf

Hello mjf,


I have added a foto of the contacts at an 6,35mm jack / plug socket (stereo).




For the foto of the 6,35mm jack plug: 1 ground
2 right channel
3 left channel



I hope that helps you.


Greets Dirk
 

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much happier camper

as a continuum in my WHAMMY saga, in loss of ideas how to change the square wave response, I searched my drawers and found a OPA2134 chip. quickly I installed it and voila, it rectified the notorious bad leading shoulder.
does it sound better? honestly, I don't know anymore.
The Sennheiser MOmentum 2 connected to the phone directly or via the amp, although easy to drive, sounds different, and I'm very much used to the direct set up.
There is still the slight crosstalk I have not fully resolved, but there are still experiments to do.
 
If you’ve got CNC it’s trivial to make a cutout for the knob and a hole for the shaft. Or hog out the back of the panel in spots to where it’s thin enough to mount the various panel mount widgets.

Doh! Hogging out the back is brilliant! (and so obvious)
Many thanks.

Alternatively, I may just get a nice piece of wood for the faceplate.
 
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Allan for doing the cut out in the back of the alloy face plate just use a regular flat bit in a drill press it only takes a few seconds. Be sure to mask the face side up well to protect from scratches. You could use a cutting compound like boelube which works brilliantly with alloy but wd40 will also do the job.

10147152.jpg
 
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