How viable is it to use a bleeder resistor rather than a direct galvanic connection to try to cut down the transient induced by static?
In our system we have moving paper that will generate occasional discharges to a large metal plate which supports the mechanics. Underneath that plate (~1 inch) there is a circuit board that has a single connection to a post coming down from that plate. A flex circuit is plugged into a connector which runs back up through that plate up a tower to an LCD. Occasionally the discharge can disrupt the LCD temporarily, basically resetting it. One thought was to try to control this discharge by inserting some series resistance between the post and where it would otherwise connect to the circuit board to provide the 'earth' connection to the circuit board. Obviously this would need to be a resistor capable of withstanding high volts and impulse type events as well as PCB layout rules to support this. Does anyone have any references to such a technique?
The alternative solution is a 27 cent ferrite around the flex circuit, and cost is a concern with the product so exotic/expensive approaches are out. Also investigating alternatives up near the LCD as well, but just wondering if there is a good way to dissipate the static shock as a bit of heat rather than disrupting the ground and everything at the LCD that is sitting up on a perch..and do it for ~$0.25 USD or less.
KJ