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Old 24th February 2012, 01:19 AM   #1051
evette is offline evette  Canada
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OH Mr. Wayne if only I had your problems. Evette
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Old 24th February 2012, 01:41 AM   #1052
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Quote:
Originally Posted by McDaisy View Post
Ive already asked this.

But what would it take to have true balanced inputs on this amp?

Would it mean remaking everything?


Thanks!

/GM
A differential input (called "balanced buffer") would need to be inserted at the input stage.

For a true balanced signal, a hot wire must carry the positive polarity signal while the cold caries the negative polarity one. It's in fact the same signal but in phase opposition. In that manner, all the potential external parasitic noises are captured equally by the two wires. The differential input then "filters out" the parasite noise because the differential input cancels it.

You see that the cold wire cannot be considered as a reference ground because it must carry the same signal as the hot one, but in phase opposition.

The preamp would need to have an inverting output as well to send the inverted signal into the cold wire.

The third wire present in a standard balanced cable is simply a chassis ground.

Hope it helps.
Tell me if I'm wrong or incomplete.
Martin.

Last edited by canonnica; 24th February 2012 at 01:45 AM.
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Old 24th February 2012, 01:48 AM   #1053
a.wayne is offline a.wayne  United States
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For true balanced line you would need 4 amplifiers in balanced configuration to make one stereo ...
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Old 24th February 2012, 02:02 AM   #1054
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Balanced output and input buffers can be found here: Balanced Line Driver & Receiver
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Old 24th February 2012, 02:44 AM   #1055
evette is offline evette  Canada
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Mr. Canonnica you are of course correct,,I would however it a little bit more by stating your cmrr should be high enough to make it worth while. Regards Evette
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Old 24th February 2012, 02:46 AM   #1056
evette is offline evette  Canada
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Mrt. wayne I have such an amplifier. Evette
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Old 24th February 2012, 03:10 AM   #1057
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by canonnica View Post
Balanced output and input buffers can be found here: Balanced Line Driver & Receiver
That is not a balanced line amplifier .....

Last edited by a.wayne; 24th February 2012 at 03:12 AM.
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Old 24th February 2012, 03:15 AM   #1058
evette is offline evette  Canada
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Mr. Wayne Sir,,He,s not saying it is He,s just stating a way of making a very cheap line driver for a balanced input. Regards Evette
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Old 24th February 2012, 03:20 AM   #1059
a.wayne is offline a.wayne  United States
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Ohh ok , I thought he wanted a fully balanced amp ...
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Old 24th February 2012, 03:33 AM   #1060
evette is offline evette  Canada
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Lets talk about something more important. Is there going to be a new group buy for this amp?
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