(1)     (2)   (Female connector seen from solder side)
	      ___|_______|___________________________________________
	  13  \  o   .   o   .   .   .   .   .   .   .   .   .   .  / 1
	       \   .   .   .   .   .   .   .   .   .   .   .   .   /
	     25 \_________________________________________________/ 14
		    
		  


	At the jack (mono):
	------------

	    (1)     (2)
	     |       |
	     |       |
	     .-D1>---.          Don't try to see if this works without the
	     |       |       diode and the resistor. If you would do that 
			     you could got your  printer  port   severely
	     |       R1      damaged!
	     |       |
	      \      [ (4)
		\    [
	    (3)  [   [     <-- This pretends to be a mono jack
		  ---
		   ]
		   .
		   ]

	R1 = 100 Ohms
	D1 = 4.7V Zener diode

	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	For those more technically oriented I have here a design that
		provides a much greater noise immunity.

	 (I DON'T KNOW WETHER THIS SECOND SCHEME IS CORRECT OR NOT.
	  I just find this lying around so if you decide to use it don't
	blame me if it doesn't work. If however, you can put it to work,
	could you send me a email?).

      . 2 resistors  (R)
      . 3 capacitors (C)
      . 1 diode
				   -----.---------- (3)
				   |    |
	 (1) ---- C1 ---.--- R1 ---.    D1
			|          |    \/
			|          |    |
			C2         R2   |
			|          |    |
			|         GND   |
		       GND              |
					|
					|
					|
					|
	  (2)  -------------------------.----R3---- (4)
		   
	C1 = 0,1uF
	C2 = 1KpF
	C3 = 1KpF
	D1 = 4.7V Zener diode
	R1 = 650 ohms
	R2 = 1 Khom
	R3 = 100 ohms

	GND = GROUND