X100 backengineered here

[uli]

It is an implementation of NP´s Aleph-CCS.
Kind of bootstrapped supply for the CCS regulator

Uli

[john-china]

why original aleph ccs do not need this bootstraped supply circuit, but yours need this?
can you explain this detailed. if i design your ax100 , i will leave the transistor in aleph ccs alone , do not attach the mosfet(irfp9610) 's Drain . what is the advantage of your design?

[uli]

Hi John,

If You look closely to the original Aleph CCS you will find
identical circuit except driving P instead of N Fet and the
zener added for safety reasons.
In fact you normally do not need the zener (just elco
protection)

Uli

[john-china]

hi uli.

how stupid i am! yes , both circuit about bootstrap supply is identical. i read them too recklessly. thanks uli.
do you understand my second question about location of the transisitor in Aleph CCS.? maybe my language is too hard to understand. let me explain it..... maybe more explanation more
obscurity, haha.
i mean, in normal Aleph , the transistor of aleph ccs exists lonely,
do not attach any driver mosfet , it is only a part of CCS. but in your circuit , the transistor connects 1K attached by the drain of mosfet( irfp9620). i just think this transistor needn't be relational to irfp9620. why do you design such .? what advantage?

[uli]

Hi John,

In fact it is not only connected via 1k to IRF9620
BUT also to output. The 1k is just a bleeder resistor
parallel to the power sourcefollower to define the
gate voltage of the outputfollower with the bias
current thru the IRF9620.

Uli

[Clarkcr]

Petter, did you ever get a working X1000 up and running?

[Clarkcr]

Sorry, I'm still getting used to posting on this board. Had I noticed the dates and read all the way though I would know your progress up to a year ago.....however, my curiousity remains....what is the latest?


C

[Nelson Pass]

I believe that crowd moved on to Aleph X, which combines the
X circuit with the Class A Aleph output stage. You will find it
"permanently" at the top of this forum. From there, many have
become excited about Gain Clones, which has its own forum.



pass: / still likes the way Halo signed off.

[GRollins]

I confess to being less than excited by chip amps, although I've got a couple of 3886s (or whatever the part number is...) lying around. I've always thought that Petter's investigations here were of interest. I have a couple of variations on the X circuit that seem fun to me, but then I'm easily amused.
It certainly wasn't my intention to put a damper on this thread by starting the Aleph-X thing.
So...just to see if anyone is listening...why not try for a class D X amplifier? The "X" aspect might be of use in removing residual nasties. Who knows, it might just be the ultimate subwoofer amp.
How's that for a blatant attempt to prime the pump?

Grey

[Sandy H.]

Originally posted by Nelson Pass
I believe that crowd moved on to Aleph X, which combines the
X circuit with the Class A Aleph output stage. You will find it
"permanently" at the top of this forum. From there, many have
become excited about Gain Clones, which has its own forum.



pass: / still likes the way Halo signed off.

I have to admit, the first amp that I built was of the GC variety, but my first and still most poignant draw to this forum has been the Pass section. I have a stack of heatsinks, Dale's Aleph 2 boards and the AX boards. The problem I have is dedication. The GC was too easy and therefore jumped up the list. I learned from it and hope to learn from the P3A that I am about to build (the first boards I ever bought).

As punctuation to this otherwise non-contributing response, I went to DIY Atlanta and heard a DIY Aleph 5. For the first time in my life, I heard something that was beyond real. To date, my goal is to complete the Aleph 2's I decided to try. Either I'm too chicken or too much the perfectionist to try it. If only courage came at 6:00, instead of at bed time. . .

Sandy. /Who misses the time when the activity on the Pass forum was the biggest on the site. . .