Here goes,
First of all, AES /EBU and SPDIF actually use slightly different data format. But, if you are just going from a source into a DAC, that usually doesn't matter, unless the DAC has a bitrate and error-rate display.
I think what you may be asking is:
How to go from balanced 110 ohm 5 volt to unbalanced 75 ohm 0.5 volt.
The answer is to use a transformer. There are various devices about. Depending on how critical you are, you could spend lots on one from Sowter or Schott, or you could use a data pulse transformer from RS or Farnell.
As for the the level difference, I would forget about it. You'll upset more with attenuators than you'll gain with level accuracy. besides, most reciever chips accept both levels.
Now, who's got a better constuctive suggestion?
First of all, AES /EBU and SPDIF actually use slightly different data format. But, if you are just going from a source into a DAC, that usually doesn't matter, unless the DAC has a bitrate and error-rate display.
I think what you may be asking is:
How to go from balanced 110 ohm 5 volt to unbalanced 75 ohm 0.5 volt.
The answer is to use a transformer. There are various devices about. Depending on how critical you are, you could spend lots on one from Sowter or Schott, or you could use a data pulse transformer from RS or Farnell.
As for the the level difference, I would forget about it. You'll upset more with attenuators than you'll gain with level accuracy. besides, most reciever chips accept both levels.
Now, who's got a better constuctive suggestion?
Hey John
The sources are all in the digital domain and will be kept there so I wont be goin into a DAC...
Looking at FIG1 in this Pic:
I can just use a few resistors compared to forking out for a transformer, but I'm just wondering the values of the resistors used in the diagram - is it 2 x 56ohm, 1 x 110ohm and a 220ohm? what are the values in the brackets?
Ta...
Dan
PS: Still aint done that PSU yet, that project is on hold atm... will be done tho!!
The sources are all in the digital domain and will be kept there so I wont be goin into a DAC...
Looking at FIG1 in this Pic:
An externally hosted image should be here but it was not working when we last tested it.
I can just use a few resistors compared to forking out for a transformer, but I'm just wondering the values of the resistors used in the diagram - is it 2 x 56ohm, 1 x 110ohm and a 220ohm? what are the values in the brackets?
Ta...
Dan
PS: Still aint done that PSU yet, that project is on hold atm... will be done tho!!
If you use only resistors, you depend on the source using a transformer as an output device. This is likely, but not certain. The AES strongly recommends makers to use one, but a few don't.
The voltages in brackets are for alternative signal levels.
Please note my earlier post.
I'm just waiting for the "digital police" to catch up with me..
The voltages in brackets are for alternative signal levels.
Please note my earlier post.
I'm just waiting for the "digital police" to catch up with me..
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.