hi there,
I am trying to fix my generic magsafe charger so that my old macbook does not get 'ghost touches'. When I ground the case with my hand touchscreen works fine, but without it I am getting erratic movements. The charger is class II - no earthing, floating ground.
What I tried so far
- add more capacitors to the output (from nF to 2200uF)
- add RC filter to the output (different coils and capacitors)
- change the Y cap from default 2.2nF to 1nF, 33nF and remove
- bridge secondary and primary winding circuit with 4x10M resistors
unfortunately, that did not improve much - and some changes made the touchbar work even worse (e.g. removal of Y cap)
The voltage between macbook's ground and me is circa 40V AC.
I would like to understand what is it that original chargers do better - that does not lead to ghost touches. And why they occur in first place?
I am trying to fix my generic magsafe charger so that my old macbook does not get 'ghost touches'. When I ground the case with my hand touchscreen works fine, but without it I am getting erratic movements. The charger is class II - no earthing, floating ground.
What I tried so far
- add more capacitors to the output (from nF to 2200uF)
- add RC filter to the output (different coils and capacitors)
- change the Y cap from default 2.2nF to 1nF, 33nF and remove
- bridge secondary and primary winding circuit with 4x10M resistors
unfortunately, that did not improve much - and some changes made the touchbar work even worse (e.g. removal of Y cap)
The voltage between macbook's ground and me is circa 40V AC.
I would like to understand what is it that original chargers do better - that does not lead to ghost touches. And why they occur in first place?
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