Homebrew PCBs

----- Original Message ----- 
  From: JanRwl@... 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Friday, May 23, 2003 6:33 PM
  Subject: Re: [Homebrew_PCBs] Membrane-switch material/process on PCB's


  In a message dated 5/23/2003 3:21:22 AM Central Standard Time, 
  cobra_neil@... writes:

  > There is a special type of material that is used on PCB's for 
  > membrane-switch 
  > contacts.

  Neil:  The only such stuff I am aware of is "conductive rubber" which the 
  membrane presses onto GOLD-plated contacts on the PCB.  These are usually several 
  interwoven "fingers" so that even a small % of contact by the rubber 
  "plunger" causes a "make".  

  I've also seen screen printed conductive ink on the pcb. The gold plating with conductive rubber seems to be a better solution, but perhaps someone else can expand the discussion. Maybe its a cost issue?
  Ron

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