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Old 3rd November 2003, 05:41 PM   #71
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I've started a thread on BOSOZ variations with a schematic that would make a decent front end for the Follower of Zen.

Grey
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Old 4th November 2003, 04:54 PM   #72
Tyimo is offline Tyimo  Hungary
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Default SE SOZ

I have a stupid question:
Is it possible to create a realy single ended design from the original SOZ circuit? (I mean not balanced) For example if would like to hear more 2nd harmonic distorsion. ( a kind of "tube like sound"). I know I can operate the SOZ from SE source, but it waste the one half of the circuit.
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Old 4th November 2003, 06:38 PM   #73
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The main problem you'd face is the DC offset. If you tie one end of the speaker to half of a SOZ, what do you tie the other terminal to? The usual answer would be ground. The problem there is that the DC offset from the Drain of the MOSFET to ground would cook the voice coil in short order.
Two possibilities occur to me. The easy way to do it would be to capacitor couple the output to the speaker. With a large enough cap, you'd get the music, but not the DC. In essence, you'd be building an original Zen, but using the 8 ohm resistor above the Drain as a sloppy current source. It'd work.
The other possibility is to contrive a device on the other side that will accept the signal, but has a DC potential equal to that of the driven side. That way the DC would cancel out and you'd be left with the music. At that point, you might as well let the "accepting" side be the other half of the SOZ, and you're back where you started. Might as well drive the "accepting" side and be done with it.
Note that if you take away half of a SOZ, the power will drop by a factor of four.

Grey
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Old 5th November 2003, 05:22 PM   #74
Tyimo is offline Tyimo  Hungary
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Grey!
Thanks!! :-((
I am down to earth....
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Old 6th November 2003, 04:31 AM   #75
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Default Re: SE SOZ

Quote:
Originally posted by Tyimo
Is it possible to create a realy single ended design from the original SOZ circuit? (I mean not balanced) For example if would like to hear more 2nd harmonic distorsion. ( a kind of "tube like sound"). I know I can operate the SOZ from SE source, but it waste the one half of the circuit.
I think you just want a Zen, or one of its variants, such as
ZV4.
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Old 6th November 2003, 06:02 PM   #76
Tyimo is offline Tyimo  Hungary
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Mr. Pass!

I built already the Zen and a Balanced Zen version from Kristijan Kljucaric. I enjoy the music with the Zens very much, but the SOZ design is fascinating me. I just thought on a not balanced SOZ, with it's simplicit...,but I think I have to try the original SOZ as it is.
Well, may be with 1 H inductors in the PSU.... :-)
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Old 16th November 2003, 10:26 AM   #77
Tyimo is offline Tyimo  Hungary
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Sorry!
I mean 1H inductor in the circuit!
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Old 16th November 2003, 01:07 PM   #78
Henrik is offline Henrik  Denmark
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Default The PMPXA

Quote:
Originally posted by GRollins
At that point, it becomes a fairly easy task to "X" the circuit. Presto! A poor man's Pass Labs X amplifier. All in two stages and with minimal parts count.
Grey
Thanks Gray.

"Poor Man's Pass (Labs) X Amplifier" I like that phrase.
I have made a first shot in the sim. It looks pretty nice. And the title coud be The PMPXA.
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Old 16th November 2003, 01:14 PM   #79
Henrik is offline Henrik  Denmark
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And some graphs
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Old 16th November 2003, 03:06 PM   #80
Henrik is offline Henrik  Denmark
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Default PMPXA

And here is The PMPXA with almost full railswing at the output, but the price paid is caps between the two stages.
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