Ive already asked this.
But what would it take to have true balanced inputs on this amp?
Would it mean remaking everything?
Thanks!
/GM
But what would it take to have true balanced inputs on this amp?
Would it mean remaking everything?
Thanks!
/GM
Vigier asked me for a smaller board,he's planning to build a 6 channel amp.Three boards per sink but he's going to use lower rail voltage
I know most of you want 5 pair trannies.The layout at post 1041 is smaller even with 5 pair trannies but I don't have the files of that layout.Maybe make one myself at least try.
Did anybody asked for a 3-pair version? It would be rather small, and be able to handle 120W RMS into 8Ohms. And having all the trannies on the same edge, it will be easy to mount on any single heatsink.
With removed on-board reservoir caps it will provide a good and compact solution for 6 or 8 channels amp.
With removed on-board reservoir caps it will provide a good and compact solution for 6 or 8 channels amp.
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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.
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For true balanced line you would need 4 amplifiers in balanced configuration to make one stereo ...
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
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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