eccoci
Ciao Tortello, sarebbe bello poter usare l' italiano, ma credo che gli altri si sentirebbero un po' esclusi, per quanto riguarda lo schema non ti preoccupare, io sto qui tutta l' estate. Ciao e grazie.
Ciao Tortello, sarebbe bello poter usare l' italiano, ma credo che gli altri si sentirebbero un po' esclusi, per quanto riguarda lo schema non ti preoccupare, io sto qui tutta l' estate. Ciao e grazie.
Prima di tutto vorrei anch'io una copia del "file". Non preoccuparti se pensi di aver offeso noi del forum - abbiamo tutti da imparare l'Italiano per praticare una seconda lingua.
Seconda lingua?!😉
Ok Nania, but, as Stefano said, it's better to write in English.
Can you indicate your mail address?
Ok Nania, but, as Stefano said, it's better to write in English.
Can you indicate your mail address?
tortello,
nania@mail.(nospam)com
just edit out the parenthetical and you have the address. Its my way of trying to cut down on the crap that fills my mailbox
nania@mail.(nospam)com
just edit out the parenthetical and you have the address. Its my way of trying to cut down on the crap that fills my mailbox
GRollins
Thanks for the link but tortello provided the file immediately upon request (must be the ubiquity of espresso in the Italian diet) but since you have made yourself available, I do have some questions.
I have just garnered 12" x 11" heatsinks with 32 1.25" fins and plan to build your Aleph-X circuit (with due accolades to Mr. Pass) in a 200W monoblock version. I am looking at 33kuF -10 75%40VDC 60V surge 85°C caps for the power supply and would like to know if they would be suitable being backed up by a 1.5kVA 60-0-60 toroid. What is the maximum bias I could use with these caps and what would be the expected heat dissipation with that bias?
As far as mounting the mosfets, do I mount them as high up on the heatsinks as I can to create the greatest thermo differential and induce maximum airflow through the fins or mount them slightly lower to get a greater conductive surface mass?
As for the aforementioned caps, will they be fast enough or will a larger quantity of smaller units sound better? I was planning on using 133kuF of capacitance so at what point does the parasitic inductance become a problem when using a smaller value parallel capacitor network? Would 24 x 5.6kuF 63V caps in parallel really sound better than 4 x 33kuF 40V caps in parallel?
Finally, if you were interested in the latest developments in the "nania audio power theory", the theory will be put on the back burner until I can get more sensitive instruments. I am planning on going back to the original thread to edit it. Upon my rereading the opening statement, I can understand why it became the object of so much derision. As always, I thank you in advance for your valued responses.
Thanks for the link but tortello provided the file immediately upon request (must be the ubiquity of espresso in the Italian diet) but since you have made yourself available, I do have some questions.
I have just garnered 12" x 11" heatsinks with 32 1.25" fins and plan to build your Aleph-X circuit (with due accolades to Mr. Pass) in a 200W monoblock version. I am looking at 33kuF -10 75%40VDC 60V surge 85°C caps for the power supply and would like to know if they would be suitable being backed up by a 1.5kVA 60-0-60 toroid. What is the maximum bias I could use with these caps and what would be the expected heat dissipation with that bias?
As far as mounting the mosfets, do I mount them as high up on the heatsinks as I can to create the greatest thermo differential and induce maximum airflow through the fins or mount them slightly lower to get a greater conductive surface mass?
As for the aforementioned caps, will they be fast enough or will a larger quantity of smaller units sound better? I was planning on using 133kuF of capacitance so at what point does the parasitic inductance become a problem when using a smaller value parallel capacitor network? Would 24 x 5.6kuF 63V caps in parallel really sound better than 4 x 33kuF 40V caps in parallel?
Finally, if you were interested in the latest developments in the "nania audio power theory", the theory will be put on the back burner until I can get more sensitive instruments. I am planning on going back to the original thread to edit it. Upon my rereading the opening statement, I can understand why it became the object of so much derision. As always, I thank you in advance for your valued responses.
nania said:
I guess for 200W monos you need around +/- 40VDC, so your transformer is not suitable as well as caps.
Peter Daniel
Thanks Peter, what would be the appropriate parts to build out 200W monos. What about 100W monos?
Sorry but I made a mistake. For 200W monos the rails would be around 32V DC, so your caps are OK. AC voltage on transformer should be DC devided by 1.25 so its around 26-0-26. It may be hard to get 1.5k transformer with that voltage of the shelf, so custom order is recommended.
For 100W rails are 19V and transformer would be 15-0-15 secondaries.
For 100W rails are 19V and transformer would be 15-0-15 secondaries.
You might take off some turns manually and I did it, but when it comes to serious power I don't recommentd it. Also, less turns different gauge of wire.
Peter Daniel
Why would I need to change the wire size if all I am doing is going from 60V secondaries to 32V??? The main windings will (hopefully) stay put and remain in position, all that I would need to do is move the "contact point" of the secondary. Is this not so?
Why would I need to change the wire size if all I am doing is going from 60V secondaries to 32V??? The main windings will (hopefully) stay put and remain in position, all that I would need to do is move the "contact point" of the secondary. Is this not so?
I guess to keep the wattage of transformer with less voltage you need more current, so probably thicker wire. But I'm not expert on transformers so can't really comment. One way would be connecting primaries in series to obtain half of secondary, but I don't know how it would work either. The best way is to contact Plitron technical dept. and ask them.😉
Peter Daniel
Do you really think Plitron is going to help me avoid buying one of their transformers? Seriously, you know how a variac works right? Isn't it the same principle as what I propse to do?
Do you really think Plitron is going to help me avoid buying one of their transformers? Seriously, you know how a variac works right? Isn't it the same principle as what I propse to do?
I think that sales dept. and technical dept. are two separate entities at company like Plitron and they don't really care. I found that people at Plitron are very helpfull and it best recommended to contact them and ask for advice. You can always say that you want to modify their transformer, right?😉
Re: 1972
In 1972 I was building my first solidstate circuit for Texpo held by Humber College. It was an up/down binary counter based on an early 4000 processor. You entered the Data with a series of 8 switches flipped the run/accumalate switch and the answer (add + subtract only) would read out in binary on a display of 8 LED's, which you then would convert to Hex. Like 0001 + 0001 + 0010.
One plus One = Two 🙂
Ahh those were the days.
Anthony
In 1972 I was building my first solidstate circuit for Texpo held by Humber College. It was an up/down binary counter based on an early 4000 processor. You entered the Data with a series of 8 switches flipped the run/accumalate switch and the answer (add + subtract only) would read out in binary on a display of 8 LED's, which you then would convert to Hex. Like 0001 + 0001 + 0010.
One plus One = Two 🙂
Ahh those were the days.
Anthony
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