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It absolutely isn't. The issues caused by mains 60Hz AC are vastly different from the issues caused by switched mode power supplies. Saying they're the same thi

by mdszy 7y ago

It absolutely isn't. The issues caused by mains 60Hz AC are vastly different from the issues caused by switched mode power supplies. Saying they're the same thing is straight up ignorant.

fuzzfactor 7y ago
>You cannot design the power grid independent of the rest of the design Never could, even the equivalent during vacuum tube efforts. Even without an electronic power supply you can use a battery. Sounds so easy, still need to watch it. Consider how they do it with competition car stereos. There are extra storage capacitors to augment the batteries since they can discharge faster than the battery to provide less distortion on large transients. Basically a car stereo amplifier is designed to neutralize your battery in time with the music. If your battery is not capable of providing the dynamics your amplifier needs, it then will not be able to reproduce them. Audio amplifiers running on AC line voltage are actually just power supplies. Power supplies which convert and filter the low AC line frequency to DC, then draw from the DC a waveform according to your incoming music preamp signal which is AC of varying amplitude & frequency, often in the distinct pattern of pop music. While your speakers' AC pattern tries to represent the preamp signal fluctuations coming in, your power supply tries to provide the continuous power fluctuations, or represent "music noise", called for during that reproduction. Anywhere along the power supply lines, an image of some small kind resembling the output can be found, mostly at the higher power extremes. This is the part of the circuitry most thoroughly isolated from the audio input & output path but there it is. The purpose of the isolation by design is to keep the line noise away from the audio reproduction components, but it must let the power through in the pattern requested by the incoming audio signal. Largely, frequencies will also broadcast over greater distances the higher the frequency is and the higher the amplitude. And wiring, especially unterminated leads, acts as antennae according to their length and direction, for both broadcast and reception. This is whether between chasses miles apart such as amateur broadcasters and recievers, within the same chassis as unwanted electronic "feedback" from one part of the circuit or power supply to another part which would ideally be perfectly isolated instead, or within the same chip, especially when the frequency is high enough, the distance small enough, and the lead length unfavorable enough to serve as the broadcast & reception antennae needed to overcome either the air gap or the electronic filtration. With linear power supplies the 50/100 or 60/120 Hz noise requires an optimized approach different than the much higher frequencies of switchers. Modern swichers can broadcast their noise further and also more easily defy the type of wiring acceptable for linear alternatives. And they can sound worse than hum too once you hear that trash, especially bad when ultrasonics are throwing audio-range harmonics down at you from other supposedly inaudible modulations.
- mdszy 7y ago
  Why is this a reply to me when you're quoting something I didn't say my dude.
  - fuzzfactor 7y ago
    Quoting the article, but I immediately saw the same type problems personally encountered in audio. Looks like the only audio subthread but seems like a good place to be.

by mdszy 7y ago

It absolutely isn't. The issues caused by mains 60Hz AC are vastly different from the issues caused by switched mode power supplies. Saying they're the same thing is straight up ignorant.

fuzzfactor 7y ago

>You cannot design the power grid independent of the rest of the design Never could, even the equivalent during vacuum tube efforts. Even without an electronic power supply you can use a battery. Sounds so easy, still need to watch it. Consider how they do it with competition car stereos. There are extra storage capacitors to augment the batteries since they can discharge faster than the battery to provide less distortion on large transients. Basically a car stereo amplifier is designed to neutralize your battery in time with the music. If your battery is not capable of providing the dynamics your amplifier needs, it then will not be able to reproduce them. Audio amplifiers running on AC line voltage are actually just power supplies. Power supplies which convert and filter the low AC line frequency to DC, then draw from the DC a waveform according to your incoming music preamp signal which is AC of varying amplitude & frequency, often in the distinct pattern of pop music. While your speakers' AC pattern tries to represent the preamp signal fluctuations coming in, your power supply tries to provide the continuous power fluctuations, or represent "music noise", called for during that reproduction. Anywhere along the power supply lines, an image of some small kind resembling the output can be found, mostly at the higher power extremes. This is the part of the circuitry most thoroughly isolated from the audio input & output path but there it is. The purpose of the isolation by design is to keep the line noise away from the audio reproduction components, but it must let the power through in the pattern requested by the incoming audio signal. Largely, frequencies will also broadcast over greater distances the higher the frequency is and the higher the amplitude. And wiring, especially unterminated leads, acts as antennae according to their length and direction, for both broadcast and reception. This is whether between chasses miles apart such as amateur broadcasters and recievers, within the same chassis as unwanted electronic "feedback" from one part of the circuit or power supply to another part which would ideally be perfectly isolated instead, or within the same chip, especially when the frequency is high enough, the distance small enough, and the lead length unfavorable enough to serve as the broadcast & reception antennae needed to overcome either the air gap or the electronic filtration. With linear power supplies the 50/100 or 60/120 Hz noise requires an optimized approach different than the much higher frequencies of switchers. Modern swichers can broadcast their noise further and also more easily defy the type of wiring acceptable for linear alternatives. And they can sound worse than hum too once you hear that trash, especially bad when ultrasonics are throwing audio-range harmonics down at you from other supposedly inaudible modulations.

mdszy 7y ago
Why is this a reply to me when you're quoting something I didn't say my dude.
- fuzzfactor 7y ago
  Quoting the article, but I immediately saw the same type problems personally encountered in audio. Looks like the only audio subthread but seems like a good place to be.