Input.
ATI's (and Theta's) implementation uses linear supplies so it must detect and reconfigure the wiring of the transformer primaries.
ATI's (and Theta's) implementation uses linear supplies so it must detect and reconfigure the wiring of the transformer primaries.
Ahh a good old Family reunion 🙂
Interestingly, the people making (arguably) the current favourite DAC, claim this about SMPS...
Poweramp A2.120 | PHISON AUDIO
"We have choosen a classic linear supply for the power amplifier as we have tested different types of SMPS and every time we end up having worse bass performance from the amplifier even is the SMPS is rated 3 times the power of the linear power supply. It is not something that we need to listen extensively to hear, it is obvious right away for everyone that have heard the difference from SMPS and Linear classic powersupply."
Interestingly, the people making (arguably) the current favourite DAC, claim this about SMPS...
Poweramp A2.120 | PHISON AUDIO
"We have choosen a classic linear supply for the power amplifier as we have tested different types of SMPS and every time we end up having worse bass performance from the amplifier even is the SMPS is rated 3 times the power of the linear power supply. It is not something that we need to listen extensively to hear, it is obvious right away for everyone that have heard the difference from SMPS and Linear classic powersupply."
🙂
We could have a riot discussing the input buffer design and op amp used by this particular OEM, but I have been sworn to secrecy.
We could have a riot discussing the input buffer design and op amp used by this particular OEM, but I have been sworn to secrecy.
Anyone can make claims 🙂
I assume that is in the context of linear (class A/B) amplifiers?
Class D amps are less sensitive to power supply issues (especially HF noise) - even more so with SMPSs designed to drive class D amps.
Especially HF noise; so maybe more issues?
Class D and class A/B amps both draw power supply current with signal, so I don't see much difference there.
Both would be sensitive to power supply sag because of current peaks combined with not so low impedance power supply.
Class D might be less sensitive to HF noise because of its limited HF bandwidth but I doubt if that is an advantage.
In what respect differ SMPS's designed to drive class D amps from common SMPS's?
Class D and class A/B amps both draw power supply current with signal, so I don't see much difference there.
Both would be sensitive to power supply sag because of current peaks combined with not so low impedance power supply.
Class D might be less sensitive to HF noise because of its limited HF bandwidth but I doubt if that is an advantage.
In what respect differ SMPS's designed to drive class D amps from common SMPS's?
One significant difference between SMPS's is whether they are synchronized or not.
Class D amps, by design, have a low pass filter / choke on the output. Yes, it is an advantage, unless you are using your amp as mosquito repellent or are trying to communicate with bats.
Synchronized with what? The typical switching frequency of class D amps?
Then that would rather be a requirement for quality; actually not an issue with a linear power supply.
Mmm, don't you think the typical RC or LC stages of linear supplies act as low pass filters as well?
Then that would rather be a requirement for quality; actually not an issue with a linear power supply.
Mmm, don't you think the typical RC or LC stages of linear supplies act as low pass filters as well?
Mains frequency.
They do, at moderate frequencies. They are remarkably bad at high frequencies due to the inductance of larger electrolyte caps.
Synchronized with mains frequency?
That's new for me. Interesting. Any link available to dive into that subject?
Instead of a couple of large electrolytic caps, preferably assemble a bank of small caps with for example Panasonic FC's, and no problems with the inductance. It's not a linear supply related issue.
That's new for me. Interesting. Any link available to dive into that subject?
Instead of a couple of large electrolytic caps, preferably assemble a bank of small caps with for example Panasonic FC's, and no problems with the inductance. It's not a linear supply related issue.
Sorry Julf: synchronous rectification is a technique to improve the efficiency of rectification in order to lower the dissipation of the rectifier stage (less heat; less voltage sag under heavy current demand).
It has nothing to do with mains frequency.
It has nothing to do with mains frequency.
But let's not disagree.
Point for me is that until now I am not convinced of the one type of power supply being superior to the other.
Manufacturers have their (mostly commercial) reasons; class D amps are made with linear supplies and class A/B amps are made with SMPS. Go figure.
Point for me is that until now I am not convinced of the one type of power supply being superior to the other.
Manufacturers have their (mostly commercial) reasons; class D amps are made with linear supplies and class A/B amps are made with SMPS. Go figure.
SMPS supplies have one distinctive disadvantage. It's hard to sell an expensive amp that weighs nothing...
Johan-Kr
Johan-Kr
I'm not on either side but the diagram in the link shows diodes replaced with switches. If those switches aren't timed correctly with the mains frequency I would expect magic smoke. Well actually a light show and loud poof!
Sent from my iPad using Tapatalk so there will be spelling mistakes...
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