I'm planning to make a major "review" of my A75 amp, built some 20 years ago (dual monoblock). At that time I used 47000uF Philips computer grade capacitors. One of the reviews is to replace these capacitors.
Now, I just finished the F5 Turbo amp, that uses a CRC filtering topology. I use an array of 10000uF Nichicon caps.
I ask for your opinion on the solution that I should apply to the A75 review.
Replace the computer grade caps with new ones or use the same CRC filtering topology used at the F5.
By the way, imho, the A75 is an overall best performer. Smooth, efortless.
The F5 has better top end...
Now, I just finished the F5 Turbo amp, that uses a CRC filtering topology. I use an array of 10000uF Nichicon caps.
I ask for your opinion on the solution that I should apply to the A75 review.
Replace the computer grade caps with new ones or use the same CRC filtering topology used at the F5.
By the way, imho, the A75 is an overall best performer. Smooth, efortless.
The F5 has better top end...
I like multiple smaller caps for PSU. I have now come to like CLC.
I suggest ccc{L+R}CCCCC as your upgrade route.
c=4700uF, L=200uH, R=0r2, C=10mF or 15mF
I suggest ccc{L+R}CCCCC as your upgrade route.
c=4700uF, L=200uH, R=0r2, C=10mF or 15mF
Bit OT but I wonder how a small aircore inductor made by isolated resistance wire BLOCK Transformatoren-Elektronik GmbH :::: Products would work in this context.
Too much resistance for the amount of inductance.
Even using copper wire for an air-core you end up with a low Q (too much resistance relative to inductance) inductor.
Even using copper wire for an air-core you end up with a low Q (too much resistance relative to inductance) inductor.
I guess you don't have room for caps banks, as your enclosure is already done, right ?
In that case, I would replace with BC caps.
my 2 cents 🙂
AndrewT - The links you have attempted to post are not live... 🙁
I am very interested in your findings!
I am very interested in your findings!
I find this interesting tho. My few and humble tests on resistors versus inductors in filters is pointing at all directions. Sometimes a resistor works better, and sometimes an inductor does wonders.
My certainly unproved investigations tells me that a good implemented inductor, taking everything in concern in the circuit in gives the best results. Tho, inductors are much more trickyer then resistors when it comes to interaction with everything else. They pass DC and blocks AC in the ideal case, but they also store energy and they are quite unlinear (aircores least unlinear tho). Oscillations with other coils and caps are not unlikely so it takes more investigations to find a good inductor based filter then a resistor based one. Imho.
Thats why I thought of resistor wire in a coil. Maybe it could calm down interaction willingness. Just a wild one, I have not come close to testing.
M Jones has some Y-cap to ground ringing cancellation practice in one of his books. Cant find it now.
Staffan
One of the major modifications is to arrange a new enclosure. The actual is rather small for the amount of electronics and heat produced. Still looking for alternatives, but my heatsinks (lateral panels) are 300mm x 150mm. One option is to have a 300mm x 400mm cover....
Then , you will have plenty of room for capacitors banks.
Go for snap-in low ESR 105C of your preferred brand and you're done.
Go for snap-in low ESR 105C of your preferred brand and you're done.
Has anyond here tried common mode chokes and connect second C bank to audioground instead of PSU/chassieground?
clarify ; there are several possibilities , according to your question(s) and some of them are BS and some aren't
in a meantime , look at this thread (sch somewhere down) : http://www.diyaudio.com/forums/solid-state/161663-nem-ai-50-a.html#post2091636
in a meantime , look at this thread (sch somewhere down) : http://www.diyaudio.com/forums/solid-state/161663-nem-ai-50-a.html#post2091636
As always
That was a hybrid amp w 2 PSUs with common mode choke input to the sand part.
I was just thinking cap input, then common mode choke and separated ground stars.
Attachments
as always (and I'm always saying that ) - GND is state of mind
your drawing is proper addendum to your previous post ....... and I have no objection
your drawing is proper addendum to your previous post ....... and I have no objection
ZM rests his case and I lift my hat. Would you have tried toroid CM chokes by any chance, the ones usual in switched supplies, or are they made for choking higher freq noice? I'm merely after to blacken out the ground noice, spikes etc from rest of apartment gadgets.
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