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"WHAMMY" Pass DIY headphone amp guide
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Old 13th January 2020, 08:59 PM   #1891
wayne is offline wayne  United States
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"WHAMMY" Pass DIY headphone amp guide
Here is a ground isolation circuit. The most important thing is to get a good hard earth ground to your chassis like Jim (6L6) stated. Remember anodizing is insulating so scrape and check with a meter. This circuit will help prevent ground loops yet carry fault currents.
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File Type: pdf GroundIsolator.pdf (5.2 KB, 96 views)
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Old 13th January 2020, 09:16 PM   #1892
MEPER is offline MEPER  Denmark
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Do you recommend that jack connector is isolated from chassis and then only make the above analog gnd to chassis (assuming that GndEarth is chassis)?
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Old 13th January 2020, 09:19 PM   #1893
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Yeah
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Old 13th January 2020, 09:43 PM   #1894
MEPER is offline MEPER  Denmark
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Ok.....but the jack connector in the official kit is not isolated and signal gnd will get chassis connection via jack connector. Probably the reason why only a small cap is recommend from input signal gnd to chassis/earth.

Then something like a Neutrik jack connector should be used. I just checked that it has isolated signal gnd.
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Old 14th January 2020, 07:14 AM   #1895
AudioSan is online now AudioSan  Norway
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Allmost all RCA jack's on the market comes with isolation washers in nylon (red and white, or red and black). Also the ones in this kit if the store image is correct.

Last edited by AudioSan; 14th January 2020 at 07:18 AM.
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Old 14th January 2020, 09:14 AM   #1896
MEPER is offline MEPER  Denmark
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Yes, but not the jack connector for the headphone. Via this connector signal gnd will get chassis connection. It works fine in my setup with no hum ect. as this it may only gnd to chassis connection. I have no earth in outlets so nothing to "polute" signal gnd via chassis. So a direct gnd to chassis works.
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Old 14th January 2020, 01:02 PM   #1897
6L6 is offline 6L6  United States
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The REAN NYS212 is isolated from chassis, has solder lugs and is switching. It’s a very nice jack. NYS212 REAN / Neutrik | Mouser
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Old 14th January 2020, 01:33 PM   #1898
AudioSan is online now AudioSan  Norway
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i got my headphone jack's from e-bay. plastic housing and switching type.
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Old 15th January 2020, 01:59 AM   #1899
Pierce911 is offline Pierce911  United States
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I'm getting some funky numbers coming out of my opamp. The measured voltages are as follows..

(1) .43 V (8) 16.63 V
(2) 14.8 mV (7) -7.08 V
(3) 13.8 mV (6) 15.2 mV
(4) -16.61 V (5) 13.9 mV

What could be causing this 2OUT (pin7) voltage? I've switched out the socket and tried different opamps that I know are working on a second Whammy that I put together.

As a reference, my other stock Whammy (which is working) measures as follows...

(1) .17 V (8) 16.59 V
(2) 14.8 mV (7) .15 V
(3) 13.8 mV (6) 15.2 mV
(4) -16.66 V (5) 13.9 mV
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Old 15th January 2020, 06:41 AM   #1900
Zen Mod is offline Zen Mod  Serbia
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solder second one better

or find missed component
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