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Power Isolation
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Posted by: sturriff
02/25/2004, 09:01:54

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Hi all,

We're working with a touch sensor system that is using earth ground as a conductive media for the touch signal.  The system needs low current DC power (5V) in order to power a micro and we've found that connecting that there are potential problems in doing this if the power source is grounded.  Does anyone know of a cheap strategy for isolating the power before it gets to our micro?

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Re: Power Isolation
Re: Power Isolation -- sturriff Post Reply Top of thread Forum
Posted by: RandyKimball
02/25/2004, 19:02:58

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If you are wanting and talking about getting rid of the static and residual voltage between your unit and earth ground. You may try providing a power supply which is exclusive to your touch unit and then place a 1 meg ohm resistor shunt across your power supply (to earth and the other non-grounded pole) at the touch unit to pass residual voltages. These residual voltages should be of a very small current, the resistor should drain them to a non-effective voltage. I'm assuming you are getting a nusance touch signal or failure to respond.
-my best try-

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