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That posting bug has been addressed.
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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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One of the things that I picked up in this thread is the fact that if you use 2 PSUs in series, the sound degrades.This is typical of one unit generating common mode noise and this adds to that produced by the second unit.Even if you run them in para...
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I no longer use BGs simply because they are too slow.Yes they sound bad when new and take 3 months to come good. Worse, if a system is not used fro a few days, they needed running in again so they only really work if you leave them on full time. I ...
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I have run each of these for long periods and can validly comment.My power amp circuitry is a 6N1 based Mu Follower driving a 2A3 in turn driving a 3K Tamura amorphous core OPT.The 6N1 tube is a special military type that is not freely available.Ther...
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I did not follow up on the issues relating to improved performance on small smps when used on filament and DAC power supplies.Here goes:The first is that the source impedance of this type of supply is very small e.g. less than one ohm. The sp...
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Paul,It would be improper for me to write down what I have worked on over almost 40 years in the telcoms business. WRT a CV for example, I have in the past written it all down and the reviewers do not believe it. Eventually, i stopped bothering abo...
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I continue to be amazed at the varied views relating to BAD power at certain times of the day.I broke with that 10 or more years ago in moving to amplifiers, line amps and DACs configured with switched mode supplies.I not only keep my DAC permanently...
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The information given in this review is truly stunning in both scope and in detail.For those who have seemingly insurmountable noise problems, they will need to pick over the fine details and explore. Not any easy task if one is not knowledgeable on...
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Romy and ClarkeA couple of tips here:To be truly effective, you need at least 3 turns of L+N through the ferrite; more if you can.The "Y" network can be placed either side depending upon where the PP3000 to PP3000 interference is coming from.You may ...
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A clue!You are not using the ground on the PP3000 unit and have ferrite packages on the incoming mains supply.I am guessing that you have fitted a clamp directly around the power cord.If this is the case, then you are using the ferrite on the ground ...
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PFC is a function of adding Xc using capacitors to bring the current in the circuit downwards.What you have is an inductive load giving a lagging PF eg a simple motor gives a PF of 0.85.Thus the inductive element can be manipulated to bring it from l...
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Romy,The common mode noise will lie between 5 meg and 8meg or 8 meg to 12 meg depending upon whether it is forward or backward mode working. It does not have much to do with the 30Kilohertz.It is possibly true that one unit may have filters to keep ...
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This is classical common mode noise interference on a common supply. This type of noise will pass right through any power conversion technology and in both directions. Due to the timing variations, I would expect it to be a little bit of mains inte...
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Paul, Please be careful here because good ol' USA is quite different when using residential pole mounted feeder transformers.What you may have is a neutral wire coming off of the 0 volts tap of the 120-0-120 secondary. This center tap is connected ...
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This is a fact but, you need to review literature relating to lightning/surge arresting systems. It is given in books such as the FURSE system because stranded conductors DO NOT WORK in that application. Flat tapes and small solid core wire should ...
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You should take care that you do not daisy chain the ground leads. Refer to following text.From my perspective, you should treat the L and N leads as one type of circuit and the PE as a separate circuit. Electrical codes, rules etc do not insist tha...
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I can only offer a simple solution to this problem.Decide on which row you wish to place digital services. I would also include anything that has a switched mode power supply because of the Y capacitor thing. Assume Row 1 will be used for digital s...
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Regrettably, No and thank you for trying.my cell number is 012 215 5716. You should send ** as international access code then 60 12 215 5716 assuming that your cell system lets you do this, it may not.Regards John...
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I have not figured out how to reply to this by direct email.I for one, am not keen on publishing my own email because of the abuse that will follow.If it can be done, one on one through this server, can you let me know how and I will contact you....
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I have my amps open and made safe from the cats diddling or so I thought.One day, I am listening to the system and reading a book.I heard a loud thud and looked up.There was my poor cat, on its back with all of its paws pointing to the ceiling an...
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The system starts as a commercial multi voltage smps unit, 48 volt output from Meanwell.I place this in a box because I have to equip the unit with a multiple pole filter card.The output is fixed, 300 watts and connected to a dc filter board equi...
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I will address the low voltage DAC power supply first since it has multiple applications.The front end comprises a commercial 48/12 volt 20 watt dc/dc converter. This basically is used to provide 1000 volt isolation input to output otherwise you...
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To answer the question WRT reliability.
I have built wholly switched mode amps with 2A3, 300B and now a 45.
I
also have a DAC 44...
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Look at the solution in a different manner.Regeneration will typically not be able to service large power transients thus, they are best suited to SET, i.e. constant current systems. Similarly any control loop cycling will usually be heard...
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