Kari, What caps do you plan to use for the 10 pF caps? I was thinking of using sangamo silvered mica film. The caps you drew in the rendering are different. I am just curious what they were?
Guy's,
Have a look at www.reichelt.de for 18-0-18V transformers. 800Va for 58 euro's.
They also offer a 15% discount at high volume sales.
Have a look at www.reichelt.de for 18-0-18V transformers. 800Va for 58 euro's.
They also offer a 15% discount at high volume sales.
Kilowattski: I'm either going to use a silvermica or polystyrene cap there. The footprint is from a Wima MKP cap as i could not find anything else in Eagle. Also i think designers today choose way too small and/or short footprints, leaving no options for you as a builder to use something else.
/Kari
/Kari
irfp 240
Hy Kari (or anyone),
can you tell me how many mosfets i will need for a pair of Aleph-X Monos due to the required matching?
Will there be a group-buy? How do other DIYèrs handle this?
Best regards, illusionxx.
Hy Kari (or anyone),
can you tell me how many mosfets i will need for a pair of Aleph-X Monos due to the required matching?
Will there be a group-buy? How do other DIYèrs handle this?
Best regards, illusionxx.
Sander said:Hi,
Gold plated looks fine to me. It probably only improve the looks, and the price isn't that much higher.
Does somebody know good information about a Power supply for the Aleph X? If read many many threads but I can't properly select good psu from bad psu's. I'm planning on ~75W in 4 Ohms. CLC, CRC, etc?
Did you look in the Wiki? An Aleph-X is not a good project for people new to DIY. From the 1400 boards sold the last two group buys only a handfull are completed.
Off-topic,
waarom quote je Einstein in het Nederlands? En helemaal lekker loopt die zin ook niet...
Taco said:
I did read the wiki, but somehow I overlooked it.
There's indeed lots of information about psu's, in the Wiki. I need just some basic information to get started. Thanks. I'm not new to DIY and elektronics. When the amp is finished you'll see the results. Instead of judging members by their first appearance, you better judge them on results and contributes to this forum. But, ok. 🙂
Offtopic:
Euh..because I'm dutch? This sentence is grammatical perfectly in balance. It's also stated like this in many dutch books. So, I don't get the point why you even bother...
Taco,
Sorry, I was a bit offended by the remark you made about Einstein. Of course I now it's not a beginner project. And I know you ment it as an advise rather then kriticism. No hard feelings. 🙂
Sorry, I was a bit offended by the remark you made about Einstein. Of course I now it's not a beginner project. And I know you ment it as an advise rather then kriticism. No hard feelings. 🙂
Sander,
The aleph x requires output transistors in multiple of 4 depending on the amount of output power you want to transfer to your load. The output power is governed by the rail voltages and how many output transistors you use to transfer the power to the load. There is a spreadsheet called the AXE-1 that will calculate what voltage rails and number of output transistors will get you the power output you desire. The spreadsheet is somewhere here on the forum and a search will easily turn it up. The thing you will have to be careful of however, is heat dissipation, as the Aleph X at 100 watts needs heatsinks that will dissipate over 280 watts of heat per channel. Real large heatsinks, huge toroidal transformers and alot of tweaking are a fact of life with this amp, but you will be rewarded in spades with wonderful sound. I hope this helps.
The aleph x requires output transistors in multiple of 4 depending on the amount of output power you want to transfer to your load. The output power is governed by the rail voltages and how many output transistors you use to transfer the power to the load. There is a spreadsheet called the AXE-1 that will calculate what voltage rails and number of output transistors will get you the power output you desire. The spreadsheet is somewhere here on the forum and a search will easily turn it up. The thing you will have to be careful of however, is heat dissipation, as the Aleph X at 100 watts needs heatsinks that will dissipate over 280 watts of heat per channel. Real large heatsinks, huge toroidal transformers and alot of tweaking are a fact of life with this amp, but you will be rewarded in spades with wonderful sound. I hope this helps.
irfp240
If you can buy the irfp240 out of the same wafer, the spread is minimal. A tube of 25 had the following spread:
3.969 3.989 3.998 4.013
3.978 3.991 3.998 4.016
3.984 3.992 4.000 4.017
3.986 3.994 4.001 4.017
3.988 3.994 4.001
3.988 3.996 4.003
3.988 3.997 4.011
So all fets out of the tube are within 50 mV.
If you buy just a bunch of fets I've experienced 300 mV difference in as little as 16 fets.
So my advice: Buy at least one tube at the time!
If you can buy the irfp240 out of the same wafer, the spread is minimal. A tube of 25 had the following spread:
3.969 3.989 3.998 4.013
3.978 3.991 3.998 4.016
3.984 3.992 4.000 4.017
3.986 3.994 4.001 4.017
3.988 3.994 4.001
3.988 3.996 4.003
3.988 3.997 4.011
So all fets out of the tube are within 50 mV.
If you buy just a bunch of fets I've experienced 300 mV difference in as little as 16 fets.
So my advice: Buy at least one tube at the time!
As i have now received 2 payments, please do NOT forget the paypal surcharge of 3.4%. I'm not collecting any profit for this what so ever so please respect this.
Thx,
Kari
Thx,
Kari
Hi,
I'm a new PayPal user so first I need to send funds to my account. Expect payment in about 3-4 days. 🙂
I'm a new PayPal user so first I need to send funds to my account. Expect payment in about 3-4 days. 🙂
Hi Kari
I am having serious problems with the Paypal-system (An error has occured...)
Will it be possible to snailmail you cash? (At my risk ofccourse)
I am having serious problems with the Paypal-system (An error has occured...)
Will it be possible to snailmail you cash? (At my risk ofccourse)
payment disaproved
Hi Kari,
i have payed for the boards via paypal from my bank account
(no credit card). the payment is disaproved. did you know why?
am I to add the 3,4 %? I hope you wait for my new payment.
greeting
adam (acaudio)
Hi Kari,
i have payed for the boards via paypal from my bank account
(no credit card). the payment is disaproved. did you know why?
am I to add the 3,4 %? I hope you wait for my new payment.
greeting
adam (acaudio)
Hi Kari,
my payment had to be repeated, my first try failed.
I´ve done the payment on wednesday again, hope everything will be there in time!
Looking forward for the boards,
Dobbeln
my payment had to be repeated, my first try failed.
I´ve done the payment on wednesday again, hope everything will be there in time!
Looking forward for the boards,
Dobbeln
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