Astatic 636l Switch Wiring Diagram. Wire color code as follows: white-audio, shield-ground, black-receive switch is used in several brand microphones like Astatic L, Turner. SOURCE: Astatic l microphone Cobra 29ltd classic. pin 1= sh & bl pin 2= wh pin 3= red pin 4= blk yellow = not used or put on pin 4. could someone give me the correct wiring ...