In regards to using Laptop SMPS on Differential Inputs Amplifier (eg. TDA7498, TPA3116/3318/3250/3251/3255, TK2050)?
1# Is SMPS consider noisy PSU for use of audio?
2# Are Laptop SMPS good PSU choice for Class D amp - does it provide current peaks beyond rated power?
3# Do Differential Inputs Amplifier (eg. EVM boards) design effective reject such noise?
4# Does Laptop SMPS affects sound character of such Amp?
5# Any other cost effective end-product PSU for use of audio?
1# Is SMPS consider noisy PSU for use of audio?
2# Are Laptop SMPS good PSU choice for Class D amp - does it provide current peaks beyond rated power?
3# Do Differential Inputs Amplifier (eg. EVM boards) design effective reject such noise?
4# Does Laptop SMPS affects sound character of such Amp?
5# Any other cost effective end-product PSU for use of audio?
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As a reference point, what oversize ratio should one consider sufficient?
Are SMPS bundled with D Amp, consider better suited than using Laptop SMPS?
I usually oversize by a factor of at least two unless I don't care if it burns out.
In one case I'm using a 750W supply for a 200W load, but there is only 15mV of ripple.
I would also tend to think an SMPS that's bundled with the amplifier will be designed to handle peak currents more easily than one for a laptop, after all a laptop isn't a very dynamic load.
In one case I'm using a 750W supply for a 200W load, but there is only 15mV of ripple.
I would also tend to think an SMPS that's bundled with the amplifier will be designed to handle peak currents more easily than one for a laptop, after all a laptop isn't a very dynamic load.
How you managed get powerful bundled SMPS; Can you name the SMPS model# of your 750W?
The bundled SMPS (24V*4 =120W) are even below the end-product D Class rated power (140W) !
24*4=96...
I'm using an ATX computer supply to drive two boost converters, one 280V, the other 380V for an integrated 6550 PP tube amp.
You could use one of these, they have several voltages depending on what the Class D amp requires.
500W +/-35V Amplifier Dual-voltage PSU Audio Amp Switching Power Supply Board | eBay
I'm using an ATX computer supply to drive two boost converters, one 280V, the other 380V for an integrated 6550 PP tube amp.
You could use one of these, they have several voltages depending on what the Class D amp requires.
500W +/-35V Amplifier Dual-voltage PSU Audio Amp Switching Power Supply Board | eBay
Thk for correction there.
interesting! for this ATX PSU, does need use a cooling fan?
Does such PSU possible cause any sound coloration?
In my limited experience yes, switching supplies need passive (LC) filtering on the output not to reduce dynamics. But the amount of reduction of dynamics depends on the susceptibility of the kit being powered.
No fan required in ECO mode. It can supply 400W in 50c ambient without the fan turning on. It's an 80 PLUS gold supply, with a 10 year warranty, that can supply 62A with 15mV of ripple. No it doesn't "colour" the sound whatsoever. In fact, it's resulting stiffness makes it much better than the equivelent linear supply, with half the weight, much better efficiency, and a lower total cost of ownership.
Here's the review: EVGA Supernova G2 750W Review
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Can share meanwell model#?
15mv ripple really? i was evaluting and read 150mV somewhere...
ECO mode?: does it comes with Fan, will automatically turn-on if the power output is getting high?
I found various Meanwell SMPS; some with fan, some without, NES, S, etc.
Thk you Sir; seems to be a PC PSU, are you tapping from +-12V, do you need to jump-start the PSU?
laptop supplies have generally a flyback type converter. the tuigh coupling betweeen primary and secondary needed results in a strong noise between the windings, mostly reduced by a capacitor between primary and secondary, across the safety barrier.
the resulting pumpout noise can be detrimental for simple audio connections between laptops and audio receiving units. audio isolation transformers like sold as audio noise filter in car audio shops can remedy that. resonant forward converters as used in modern high efficiency sw mode supplies have far less pumpout noise.
the resulting pumpout noise can be detrimental for simple audio connections between laptops and audio receiving units. audio isolation transformers like sold as audio noise filter in car audio shops can remedy that. resonant forward converters as used in modern high efficiency sw mode supplies have far less pumpout noise.
In my experience this style is more than good enough.
250W 12V 21A Slim Power Supply AC DC Adapter For LED Strip CCTV 110V 220V #2 | eBay
Does it mean Differential Inputs mode completely negate/indifferent to the effects of ripple voltage (be it low or high) from SMPS?
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