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- (1) (2) (Female connector seen from solder side)
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- 13 \ o . o . . . . . . . . . . / 1
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- 25 \_________________________________________________/ 14
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- 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
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