74LS641 Transciever Interface CircuitComponentsIC1 � 74LS641 IC2 � 74LS641 IC3 � 74LS33 C1 � DB25 connector R � 2.2K?74LS641 is an octal transciever for converting 5 to 3.3v and back. 74LS33 is a 3.3 Voltage Regulator. DB25 is the parallel port male connector to attach to the Parallel Port. 2.2k Resistors are pull up resistors. Tags: PC Interface , Circuit , 74LS641 , 74LS33 , DB25 , |