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In Reply to: RE: Regulators Perfromance posted by fmak on November 16, 2014 at 22:19:41
But excellent.
A link to my experience with the Belleson Superpower in a Graham Slee Reflex X phono stage is below. Since I bought mine, they have come out with a lower current version, which is smaller and would have been a better fit. I'm very pleased with its performance, and have a couple more sitting here, ready to go into the power supply of my Horn Shoppe Truth line stage if I ever find the time to get around to it.
One thing to note is that Belleson doesn't recommend using pre-regulators before a Superpower, as they feel they reduce dynamics. That's something to remember when you're considering overall cost and space required. Eliminating the need for pre-regulation reduces the cost of the upgrade and simplifies the installation.
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it is a warning about current limitation in the preregulator.
For all the plots taken in a laboratory, lf performance and pickup insitu can be very different, and requires confirmation thru measurement. I have done this on several 'super' regulators. With chip based ones, for example, lf performance is rarely what they are claimed to be in the general context thru lab measurements. Hence preregulation when needed.
Real world vs laboratory makes a lot of sense. But I'm curious, how do you determine when pre-regulation is needed? Scope measurements, or by ear?
I'll admit to never trying pre-regulation once I switched to the Belleson. I simply went with Belleson's recommendation, especially in light of them not trying to sell me two regulators with a "Two in series is even better!" sales pitch. That helped convince me that they were an ethical company to deal with.
I have a 1MHz 1 uV ac voltmeter + Tektronix 400MHz scope.
Yes, and it would give you TWO voltage drops, > 2.5 volts each whereas only ONE is what is designed for. Not to mention that the board would probably NOT have sufficient room for two sets of everything.
From Belleson's web site:
"Drop-out voltage is as low as 1V at currents to 2A for the SPJ version."
If you are talking about my Graham Slee phono stage board being designed for one regulator, that's true, if you're only looking at the main phono stage. But in my "review" of the Belleson, you'll note that I stated that the Slee came with an external DC power supply, which is regulated to 24V, and then regulated again inside the phono stage to 18V.
The reason I mentioned pre-regulation is because fmak said "Pre regulation into this array is even better.", and according to Belleson, pre-regulation becomes not only unnecessary, but undesirable.
of your circuit.
You're using the 'regulated' term loosely. The DC can be rectified ADD filtered, but when you put it through a regulator, it 'drops' the voltage AND consumes some energy doing so. There are 'low drop-out' regulators, but I hear that they are undesirable because they are noisy or something, so most regulators are full drop out, typically about 2.5V. Only something to worry about if you are inserting into an existing circuit, and if all you do is replace one regulator with a similar, but better, one, the voltages hardly change.Most gear can run within a range of voltages AFAIK. Usually +-10% is expected, but I believe a greater range is often possible, if one is stuck with a particular transformer, for instance.
Edits: 11/17/14
At the risk that I misunderstand you, not all voltage regulators drop the same voltage in order to achieve regulation. The voltage dropped will relate to the impedance of the particular regulator and the amount of current drawn by the downstream circuit, as someone else also mentioned. Furthermore, typical voltage regulators require a restricted range of input voltages, in order to regulate properly, in relation to the desired output voltage. Not too much (which can damage the regulator due to heat) and not too little.
I used the term 'regulated' to describe a DC power supply circuit which contains a voltage regulator, and in the case of my (pre Belleson) Gram Slee, two regulators in series. How do you conclude that to be used 'loosely'?
"There are 'low drop-out' regulators, but I hear that they are undesirable because they are noisy or something"
Fmak, the original poster, started a topic regarding Belleson Superpower regulators specifically, which is what I'm commenting on. The Belleson is a low drop-out regulator, and if you look at the measurements on their web site, they're not at all noisy 'or something'.
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