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-   -   The simplified schematic of J2 what I suppose to be. (http://www.diyaudio.com/forums/pass-labs/154927-simplified-schematic-j2-what-i-suppose.html)

wensan 13th November 2009 11:25 PM

The simplified schematic of J2 what I suppose to be.
 
Here is the simplified schematic of Firstwatt J2 that published in the owner's manual of J2.
http://pic.hifidiy.net/forumid_2/091...cd7aa47d2f.gif

It says the output stage current source is no longer an "Aleph" current source, but a version of the classic "Mu Follower".
But the simplified schematic of Firstwatt J2 shown just a basic circuit of SRPP(Shunt Regulate Push-Pull).
Since it claimed to be a Mu Follower,
I suppose the simplified schematic of Firstwatt J2 should be just like this.
http://pic.hifidiy.net/forumid_2/091...ba30a71d22.gif

At first, I guest the regulator IC in the schematic is TL431.
Then the voltage drop of those two resistors will be 2.5V, it seems too high.
So, I guest the regulator IC in the schematic is LM385.

Nelson Pass 14th November 2009 06:13 PM

That will work, but it is not the J2 voltage source. I am not
planning on making the circuit details public, so I suggest
that you just pick a nice voltage source and go with it.

:cool:

wensan 15th November 2009 06:31 AM

1 Attachment(s)
Quote:

Originally Posted by Nelson Pass (Post 1980621)
That will work, but it is not the J2 voltage source. I am not
planning on making the circuit details public, so I suggest
that you just pick a nice voltage source and go with it.

:cool:

Yeah, I knew that will work.
But if I announce this schematic not you,
I think no one will have interest in it.
So sad! :(

Melon Head 15th November 2009 06:58 AM

Sad for them, but not for you

wensan 15th November 2009 08:33 AM

Quote:

Originally Posted by thanh1973 (Post 1981264)
Sad for them, but not for you

Thanks!:)

eyoung 15th November 2009 02:07 PM

Build it and they will come, somehow I think I've heard that before.
You certainly have my interest, keep it going.

Regards, Elwood

Zen Mod 15th November 2009 02:24 PM

be brave .... and confident ;)

about lack of attention to your thread -

greedy boyz like to have Papa's blessing for their usual hysteria

:clown:

wensan 16th November 2009 08:19 AM

Quote:

Originally Posted by Zen Mod (Post 1981480)
be brave .... and confident ;)

about lack of attention to your thread -

greedy boyz like to have Papa's blessing for their usual hysteria

:clown:

Maybe I am one of the greedy, too.:confused:

fff0 16th November 2009 09:27 AM

Quote:

Originally Posted by Nelson Pass (Post 1980621)
.....I am not
planning on making the circuit details public, so .......

:cool:

Serious? Not even after hitting your quotas? hmm... guess I took it for granted but well... lets see how near we can get to the real J2... :spin:

Zen Mod 16th November 2009 10:09 AM

Quote:

Originally Posted by wensan (Post 1982288)
Maybe I am one of the greedy, too.:confused:

we are all ........ :cheers:


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