Hi cdr data,
NAD used a single bjt input instead of a diff pair. This design does not compete well sonically with other approaches. If it did, that would be the prevailing design. The diff pair can be far more linear, over a greater input signal range. It is self balancing for DC offset and there is no DC offset between the error input and signal input (0.6V for the single bjt).
There are enough variations between input device types and configurations to keep one busy for an awfully long time. At least you are on ground that is proven and stable.
You have only listed a couple output configurations. Lots of different ways to do things here too.
The answers depend one what you intend at the end, and cost. One circuit may not fit all situations.
-Chris
NAD used a single bjt input instead of a diff pair. This design does not compete well sonically with other approaches. If it did, that would be the prevailing design. The diff pair can be far more linear, over a greater input signal range. It is self balancing for DC offset and there is no DC offset between the error input and signal input (0.6V for the single bjt).
There are enough variations between input device types and configurations to keep one busy for an awfully long time. At least you are on ground that is proven and stable.
You have only listed a couple output configurations. Lots of different ways to do things here too.
The answers depend one what you intend at the end, and cost. One circuit may not fit all situations.
-Chris
Try this address: http://sound.westhost.com/amp_design.htm
Rod Elliot is well known audio master. You might find some answers there.
Rod Elliot is well known audio master. You might find some answers there.
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