I'm designing my own pic programmer and, as i want
 to support many pic types, i need to know what's
 the best way to electronically switch the programming
 voltage from a pin to another without damaging the
 TTL driver...

 TTL driver --##------ ZIF socket pin
 VPP--------##

 ## is the switch
 ## device


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   - *Alex* -

  http://freepage.logicom.it/azummo/