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Old 21st July 2005, 10:21 AM   #1001
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I'm a John Wayne . . .
I wear Weller WS80 on the left side and Hakko 936 on the other side . . .


Regards, jH
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Old 21st July 2005, 01:17 PM   #1002
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Quote:
One of these days I'm just going to put it on a DVD and toss it out, probably after I lose my mind.
Another language barrier for me. Is this mean you will do it or you will not do it?

If it is positive answer (will do it), please include me in the list, Mr. Pass . I will pay for the DVD and shipment.

Hi, Jacco,

Yes, bunch of Nelson Pass articles which can be downloaded from internet has already forming a book
But I'm expecting to see cct's/articles that NP has never made public yet. I'm sure there are alot of it

I see those cct's/articles quite different than handbooks like DougSelf or RandySlone. Books like Dougself is a guidance for making audio amplifier. Mr. Pass' schematics is a guidance for making "good sounding" audio amplifier. Even it is in a form of a schematic without any word at all.
What can you say. A picture (cct) equals thousands of words.
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Old 21st July 2005, 02:06 PM   #1003
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Quote:
Currently, I am still exploring minimalism
Once I read that some of people sending NP better caps or accesories, and he wrote that he would appreciate more if someone is sending more linear device.
At the time I read that post, I dont take it seriously, at that time I take a transistor as it is, a perfect device.

Now somehow my search for ideal amp is stuck with transistor nonlinearities.
I read about the background of F series amp. Why make 300W power amp if 299W is not good?
So, why make 10 or 20 transistor power amp if each is producing more nonlinearities/IM?

But for now, I haven't reach the Zen era. I'm still enjoying the Threshold/Smartbias/Efficient classA era. Still a lot more interesting stuff this era.
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Old 21st July 2005, 08:00 PM   #1004
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Quote:
Originally posted by lumanauw



But for now, I haven't reach the Zen era. I'm still enjoying the Threshold/Smartbias/Efficient classA era. Still a lot more interesting stuff this era.
lumanauw, you can say Nelson has been ENLIGHTENED for more than 10(?) years now.
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Old 22nd July 2005, 12:43 AM   #1005
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I think more than 20 years ago he has already know what elements are tobe considered in making good sounding amps.
And what is amazing, in that era there is no internet, no handbook, no discussion forum (like we can access easily today). Achieve all that by himself.
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Old 22nd July 2005, 03:08 AM   #1006
Ipanema is offline Ipanema  Malaysia
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Default output impedance calculation

Hi Mr. Pass,

For 0.91V and 0.45V, I got Rs of 9.89ohms and 57.44ohms, but for 0.091V and 0.041V I got 998.9ohms and 997.4ohms. This two results are not the same although the ratio are. I'm confuse. Pls enlighten me on this.

Thanks.

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Old 22nd July 2005, 05:17 AM   #1007
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Ipanema said
Quote:
I'm confuse. Pls enlighten me on this.

Here is a Thevenin version.
The Norton version with current source and shunt resistor
gives the same answer.


I think I got the equations and numbers correct.

Tom
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File Type: gif output.gif (7.5 KB, 1507 views)
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Old 22nd July 2005, 07:19 AM   #1008
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I agree with Tom2's solution. Equations 1 and 2 were derived using the Voltage Divider formula based on the attached equivalent circuit. The combined equations will also yield:

Rs=(R1R2(V1-V2))/(V2R1-V1R2)=969.5 ohms
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Old 22nd July 2005, 09:36 AM   #1009
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Quote:
Originally posted by Nelson Pass
The ratio is all that matters.
The way i read 0.91V is 0.91*Vs, not 0.91 volts.

solve:
0.91*X= 100/(Rs+100)
0.45*X= 47/(Rs+47)
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Old 22nd July 2005, 08:21 PM   #1010
Blues is offline Blues  United States
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Quote:
Originally posted by jacco vermeulen


The way i read 0.91V is 0.91*Vs, not 0.91 volts.

solve:
0.91*X= 100/(Rs+100)
0.45*X= 47/(Rs+47)

Jacco, it's more like 0.91=Vs*(100/(Rs+100)) Eq1 and

0.45=Vs*(47/(Rs+47)) Eq2. (as per Voltage Divider)

Dividing Eq1 by Eq2 as Tom2 said will cancel Vs and NP's ratios remain.
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