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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Ladder stepped attenuator downsides please posted by beto1 on August 13, 2015 at 17:56:34:
Upsides: The input impedance is constant no matter the attenuator position
Downsides: when you are switching the output goes open circuit briefly. This can create problems downstream depending upon what you are feeding with it. Anything mitigating this might have a sonic signature (such as having a make-before-break switch, or a brief mute), and doing nothing will have a sonic signature (perhaps a popping or clicking sound)
It is more complicated than other topologies requiring nearly twice as many resistors.
There is nothing magic about it, really. With a buffer circuit the changing impedance of a series attenuator is mitigated entirely (it isn't the number of components, but the changing impedance that might have any kind of sonic impact)
If you are trying to design a passive preamp, I'd likely go with the ladder network. But I'd try to control the impedance between resistors (say a large value resistor to keep it from going entirely open circuit?)
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Follow Ups
- Topology - Bromo33333 07:49:44 08/14/15 (1)
- RE: Topology - beto1 08:25:28 08/14/15 (0)
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