One of the comments say that the amp it is used to power is very noisy, so I guess some additional filtering and shielding is necessary. But, isn't it the case with a linear PSU?You'd probably have to house the PSU in a separate enclosure, in addition to filtering?
Yes, the lack of "thinking" is often at the center of many problems.One of the comments say that the amp it is used to power is very noisy, so I guess some additional filtering and shielding is necessary. But, isn't it the case with a linear PSU?
The problem is many people think it just takes to put an smps in palce of a linear PSU, but actually, it takes some thinking.
One of the comments say that the amp it is used to power is very noisy, so I guess some additional filtering and shielding is necessary. But, isn't it the case with a linear PSU?
The problem is many people think it just takes to put an smps in palce of a linear PSU, but actually, it takes some thinking.
Just by instinct, having a high frequency oscillator feeding a transformer, at those voltages, makes me think of quite a bit of EMI being 'broadcast' by the power supply.
My concern is what happens inside a tube at power-on when a SMPS feed of B+ arrives? I have seen high voltage output SMPS able to produce an extremely short duration very large voltage spike before settling.
Worse though is just how 'quiet' can any sort of SMPS ever be not only their terrible RF interference they generate but just how 'quiet' can the DC produced ever be filtered without making the SMPS more expensive that a linear.
There would have to be some filtering on the output. Currently I advocate using a simple capacitance multiplier. That will take RC time to reach voltage so any "spike" won't make it through.
SMPS have come a long way over the years. Some of the MeanWell LED supplies are known to be very quiet. But there are a bunch of rules about picking the right size, how to keep it out of hiccup mode, filtering the output and so on. If done correctly it's pretty easy to get completely noise free power.
Please offer us any make/model from a reputable manufacturer... (not an Aliexpress special). I would love to get hold of such a unit that can produce a B+ in the range of 100VDC to 550VDC unit and do some testing mainly with tube based audio amplification.There would have to be some filtering on the output. Currently I advocate using a simple capacitance multiplier. That will take RC time to reach voltage so any "spike" won't make it through.
SMPS have come a long way over the years. Some of the MeanWell LED supplies are known to be very quiet. But there are a bunch of rules about picking the right size, how to keep it out of hiccup mode, filtering the output and so on. If done correctly it's pretty easy to get completely noise free power.
Currently I am investigating the Meanwell ELG-150-C500A. It is actually an LED driver but until the current limit kicks in it will provide 300VDC at up to 500mA. Only ÂŁ41 from Farnell. Datasheet here: ELG-150-C500APlease offer us any make/model from a reputable manufacturer... (not an Aliexpress special). I would love to get hold of such a unit that can produce a B+ in the range of 100VDC to 550VDC unit and do some testing mainly with tube based audio amplification.
Please offer us any make/model from a reputable manufacturer... (not an Aliexpress special). I would love to get hold of such a unit that can produce a B+ in the range of 100VDC to 550VDC unit and do some testing mainly with tube based audio amplification.
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