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Class D Switching Power Amplifiers and Power D/A conversion

Industrial 12V PWR supply to be used with T-amp
Industrial 12V PWR supply to be used with T-amp
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Old 1st August 2005, 10:46 PM   #31
sx881663 is offline sx881663  United States
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One more example and I will let it rest, agreeing to disagree. A customer wanted his old Bose 901 EQ upgraded. The original unit had a lot of residual noise including line freq artifacts. Upgrading most of the parts and regulating the power helped a lot but it still was too noisy. The next step was putting in a quality toroidal transformer. This also helped but still was unacceptable as it needed to be in the same case. The final solution was the input regulator was removed and a small switcher was installed feeding the circuit directly with the same filter caps left in. This solved the problem almost completely. It was now perfectly acceptable to the customer. This particular circuit is single ended and high impedance to boot. It is extremely sensitive to all types of noise. The SMPS was the only solution outside of a remote supply that would work.
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Old 1st August 2005, 11:23 PM   #32
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There are too few specifics to draw a conclusion about a particular application, IMO, but a complete consideration of where the noise came in and what type of filter was needed, would be necessary.

IMO, if there was noise with a linear it wasn't because it was a linear rather than a switcher, rather that whatever filtration was necessary to remove that noise, happened to be incorporated into the switcher above and beyond the bare-bones referect design of it. Same goes for a linear. Since we had a situation where the incoming power to the supply was probably too noisey, a typical line filter in front of the linear would've likely been sufficient. Apples and oranges.
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