SID protection circuit
  ----------------------


  (5)  O---------o----------o-------XXXXX-----O  Audio in
                 |          |
                 |          |                    __
   	      +-----+     -----                 /  \
 <-- to SID    \   /       / \          <--   -+----+----+-
 	        \ /       /   \                      \__/
	       -----     +-----+
	         |          |
  (2)  O---------o----------o-----------------O  GND

  
  XXXXX  = resistor 470ohm
  diodes = 1N4148 or 1N914
 
 
 (Marc-Jano Knopp <mjk@rbg.informatik.th-darmstadt.de> on 97/01/12)