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Old 13th April 2008, 08:17 AM   #311
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Join Date: Oct 2007
Hi Peter

Thanks for this interesting transport project!

I tried to order one yesterday and it seems, I found one online.

Let's look.

BTW: I did not find a translation machine from polish language to english.

Any hint?

Kind regards
Franz
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Old 13th April 2008, 09:02 AM   #312
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Quote:
BTW: I did not find a translation machine from polish language to english.
Sorry, just google

A question: isn't it a disadvantage, to have a open drive?

No interferences / disturbance from the environment light?

Kind regards
Franz
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Old 13th April 2008, 09:25 AM   #313
OneyedK is offline OneyedK  Belgium
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Quote:
Originally posted by Franz Gysi

No interferences / disturbance from the environment light?
We all listen in a dark room on sundaymorgings only (when the electricity is best for the real audiophile) ;-)))

No, seriously, you might have a point there, but as long as the light is rather constant (and it is most of the times) there will be no audible influence.

I worry most about the dust fallin' in...
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Old 13th April 2008, 09:32 AM   #314
JeroenR is offline JeroenR  Netherlands
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Perhaps a useful tip.....

I removed the display-connector but kept the leads. As I just want to use the remote and perhaps the buttons I wanted to get rid of the flat-cable. You can bend the connector upwards (some force) and cut of the sides, then fold the part without leads of the connector forward by sticking a screwdriver into the connector and twist. As the plastic is hard it will break of easily. Now you have a radiator like piece of plastic with the iron leads. Bend the leads up and again with a screwdriver wick out one by one the plastic strips. See picture for result. It should be easy now to add some wires.... if I can find out again what is pin 1...
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Old 13th April 2008, 09:58 AM   #315
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Quote:
Originally posted by OneyedK


Sorry to quote this old post, but I calculated the resistors again.
Theoretically it should be 375 and 93.75 Ohm.
(you still woulld have to subtract the chips output impedance from the 375 Ohm)
That would give a perfect 75 Ohm output impedance, 1Vpp unloaded and 0.5Vpp loaded with 75 Ohm.
Any other value will render the coax into an antenna or ignore s/pdif specs. (and thus the receiver input)
That speaking out in terms of scheme is 375 in series at the output followed with a 93,7 in parallel ........ isnt like that ?
Well I guess that will work realiably if the chip output has enough power ...
Am I going to try a toslink ?
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Old 13th April 2008, 10:28 AM   #316
OneyedK is offline OneyedK  Belgium
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Quote:
Originally posted by stefanobilliani


That speaking out in terms of scheme is 375 in series at the output followed with a 93,7 in parallel ........ isnt like that ?
Well I guess that will work realiably if the chip output has enough power ...
Am I going to try a toslink ?
Yeps, LC78601E uses 5V so at worst case output would still be 4Vpp (If output current is 12mA).
Chip output will have enough power.
/edit: Kevin, your 3.3V-assumption appears to be wrong.

I'll use a 93.1 Ohm as -what you call- the parallel-resistor and an adjustable 500 Ohm as series resistor. Measurement will show the exact value I need for the series resistor.
1Vpp unloaded output, 0.5Vpp loaded output.
Output impedance is more important than exact output voltage, so I won't worry if I end up with 1.2Vpp unloaded and 0.6Vpp loaded with 75 Ohm.

Toslink? In high end? Tsss... ;-)))
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Old 13th April 2008, 10:38 AM   #317
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Quote:
Originally posted by OneyedK


Yeps, LC78601E uses 5V so at worst case output would still be 4Vpp (If output current is 12mA).
Chip output will have enough power.
/edit: Kevin, your 3.3V-assumption appears to be wrong.

I'll use a 93.1 Ohm as -what you call- the parallel-resistor and an adjustable 500 Ohm as series resistor. Measurement will show the exact value I need for the series resistor.
1Vpp unloaded output, 0.5Vpp loaded output.
Output impedance is more important than exact output voltage, so I won't worry if I end up with 1.2Vpp unloaded and 0.6Vpp loaded with 75 Ohm.

Just to avoid confusion .
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Old 13th April 2008, 10:49 AM   #318
OneyedK is offline OneyedK  Belgium
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Yeps, perfect...

And 375 = Zout + R1
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Old 13th April 2008, 11:02 AM   #319
OneyedK is offline OneyedK  Belgium
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I guess the 12mA in the datasheet (LC78601E) aren't chosen for nothing.

So a recalculation with 12mA and 4Vpp chip output, gives
R1=291 Ohm and R2=100 Ohm to get 1Vpp unloaded and 0.5Vpp loaded with 75 Ohm.
I'll stick with these values. Kevin came prettty close, even starting from the wrong assumption.
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Old 13th April 2008, 12:25 PM   #320
johnm is offline johnm  United Kingdom
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So does this mean that Peter's values of 2 x 75 ohms is maybe not a good idea then in practice?
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