1 LED an LPT zum leuchten bringen

[turboPASCAL]

Code:

.                                                 V+  (12V)
.                                                  |
.                                     +------------+
.                                     |            +------+
. Parallel                            |            |      |
. Port                                |    D1     ---     |
.                                     |   1N4001  / \    Relay coil
.           R1    1  ----------- 5    |          /---\    |
.  D(x) ----1k------| Opto-     |-----+            |      |
.                   | Isolator  |                  +------+
.  GND -------------|           |-+                |
.                 2  ----------- 4|                |
.                    CNY 17 or    |   R2        | /
.                    4N25         |   4.7K    B |/  C   T1
.                                 +--\/\/\/\/---|      BC547A or 2N2222A
.                                               |\  E
.                                               | V
.                                                 |
.                                                 |
.                                                ___
.                                           external circuit ground

So etwas findet man u.a. hier: http://www.epanorama.net/circuits/parallel_output.html