Received some pcb's today from ebay. Aleph 3 is printed on it.
The pcb's have a goldplated copper thickness of 75um (pcb is 2mm)
My question is, is it a aleph 3? And is it any good in this form?
And, are there mods is can do directly.
Posted a picture of the pcb and the parts list and schematic that came with it.
The pcb's have a goldplated copper thickness of 75um (pcb is 2mm)
My question is, is it a aleph 3? And is it any good in this form?
And, are there mods is can do directly.
Posted a picture of the pcb and the parts list and schematic that came with it.
Attachments
I hope you appreciate that all the MOS-FETs need to be matched. Not to each other but in pairs for the Aleph 3.
Here is the Pass Aleph 3 Service Manual...
http://peufeu.free.fr/audio/schemas/Pass_Aleph_3.pdf
The PCB layout is not that critical, unfortunately the Orientals often go for an aesthetically pleasing PCB layout design rather than one that is optimum for performance.
http://peufeu.free.fr/audio/schemas/Pass_Aleph_3.pdf
The PCB layout is not that critical, unfortunately the Orientals often go for an aesthetically pleasing PCB layout design rather than one that is optimum for performance.
No, the top two are one pair and the bottom two are another.
The two pairs can be different.
This is only to ensure that each one of the pair shares the load current with its pair.
When my Aleph 4 was built it took over 50 MOS-FETs to get the 4 x 6 matched sextets.
The two pairs can be different.
This is only to ensure that each one of the pair shares the load current with its pair.
When my Aleph 4 was built it took over 50 MOS-FETs to get the 4 x 6 matched sextets.
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Nothing wrong with Chinese boards, although I like to use U.S. sources
(costs a little more) and spec heavy copper. (heavy copper for obvious
high current, but mostly easier to re-solder when replacing components)
Nothing wrong with KK's schematic, although it is not identical to original.
I will post a thread on the latest thinking about this circuit in a day or less.
😎
I didn't said that , just clarified what's what
however , search around and I believe you'll find appropriate schematic/nomenclature of parts
😱
Hi Gentlemen and Mister Hal, happy new year.
Do you know somebody has for sale this kind of species in a matched quartet or sextets?
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Hi my dear friend, sorry for my ignorance, what is h_a?
Early in the morning good day and good year (In Tires I prefer Michelin)
Early in the morning good day and good year (In Tires I prefer Michelin)
same to you , regarding day and year 😉
regarding h_a ....... that's slightly more than third of hahaha
(I see you got link from Alan
)
Guys the boards came with following power supply.
Zen Mod helped me a lot with choosing the right chokes (thanks again! ) got a question about the voltage for the aleph 3.
On the aleph3 schematic it says it needs 25vdc . The power supply schematic shows a 21v ac (secundaries) transformer. After rectification it would be 29.6v dc. does a psu have a voltage drop of about 4v when using chokes etc? Or do i need a other transformer.
Zen Mod helped me a lot with choosing the right chokes (thanks again! ) got a question about the voltage for the aleph 3.
On the aleph3 schematic it says it needs 25vdc . The power supply schematic shows a 21v ac (secundaries) transformer. After rectification it would be 29.6v dc. does a psu have a voltage drop of about 4v when using chokes etc? Or do i need a other transformer.
An externally hosted image should be here but it was not working when we last tested it.
