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- How to build a Jughead's D/A Converter
-
- (C) 1989,1990 by Tomi Engdahl
-
- Writing date: 20th May, 1990
-
-
- You need:
- Connectors: D25 male
- D25 female (optional)
- Resistors: 640k,320k,160k,80k,40k,20k,10k,5k,390 (+-1%)
- (You can use different values of resistors, but
- the ratio of the values of the resistors must be
- same. 1, 2, 4, 8, 16 etc.)
- Capacitor: Electrolytic 10 yF 10V
-
-
- CHEMATIC
-
- ------
- l 2 l ---<640k>---+
- l 3 l ---<320k>---l
- l 4 l ---<160k>---l
- l 5 l ---<80k>----l
- l 6 l ---<40k>----l
- l 7 l ---<20k>----l-----+---- 10 yF -------> Out
- l 8 l ---<10k>----l l
- l 9 l ---<5k>-----+ <390>
- l l l
- l 25 l ------------------+------------------> Ground
- ------
-
-
- How to build
-
- Solder all D25 male connector pins to corresponding D25 female
- connector pins (pin 1 to pin 1 etc.). Connect the resistors
- according the chematic. It is maybe not possible to obtain exact
- resistor values. If you can't obtain them, try nearest values.
- <1% deviation is acceptable.
-
-
- How to use
-
- Connect this circuit to the centronics printer port of your IBM
- PC or compatible. Connect the printer cable to the D25 female
- connector of the circuit. Your printer should work correctly
- with this circuit and you can keed this circuit connected all
- the time. Connect the sound output to your stereo system. Line
- in and mic lines are suitable because the output level of this
- circuit is adjustable (about 0-2V PP). The sound quality is very
- good.
-
-
- DISCLAIMER
-
- I don't consider myself as responsible for anything considering
- this circuit. I am not responsible to any losses caused by this
- circuit diagram to anybody/anyone. If you can cause some damage
- with this circuit, it is your fault. If this this circuit does
- not work, it is not my fault (you have made something wrong if
- this circuit does not work).
-
-
- Contact the author
-
- If you have made interesting software which supports this device
- or you have ideas how to improve this circuit, please write to:
-
- Tomi Engdahl
- Kalliomäntie 8bF
- 01800 Klaukkala, Finland
-
-