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Old 8th July 2010, 05:54 PM   #101
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Ostripper, see if you can do better than this. Make sure OL phase is at -57 degrees @ 0db so we know you'll get the same results as I did.

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File Type: zip Mongrel_Ksim2.zip (7.2 KB, 101 views)
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Old 8th July 2010, 06:18 PM   #102
AndrewT is offline AndrewT  Scotland
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what do we do with Mongrel.txt?
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Old 8th July 2010, 06:21 PM   #103
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Mongrel.txt contains all the necessary models for the simulation. It only needs to be in the same directory, and LTSpice will use it's contents when it scans the ".include mongrel.txt" command in the schematic. This is included so that the same device models are used whenever the file changes hands. This way we all get the same results.

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Old 8th July 2010, 06:25 PM   #104
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by ostripper View Post
the reason for the 'mongrel" ...A supersym/symasym wrapped in every economical enhancement this site has to offer while still keeping it fairly simple.
My goal is to have the complexity somewhere between a quasi amp and one of the advanced PPM amps (syn08 stuff) , the build to be as easy as a quasi or symasym (perhaps easier).
It seems to me that this could be the 2010 DIY Audio SS reference amp. If so, pcb's from a vendor might be the way to go (no toner transfer).
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Old 8th July 2010, 06:26 PM   #105
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could not open include file "mongrel.txt"
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Old 8th July 2010, 06:37 PM   #106
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Hey , keen read post #485 ,#487 ,and #489. Here ... The Frugalamp by OS

It is optimal for the phase to start at 0 dg , slope to a shelf of -90 / -100dg , and not dropping past that until after the unity gain point. Using these rules , I stabilized all the frugalamps and my present supersym (1 year old ).

Detailed explanation is here : The Frugalamp by OS.... Post #474.

Good info ,better sounding with no burning amps since.


OS
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Old 8th July 2010, 06:38 PM   #107
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Did you extract the zip file to a folder before you opened it? LTSpice can't look inside zipped folders.

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Old 8th July 2010, 06:43 PM   #108
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Quote:
Originally Posted by ostripper View Post
Hey , keen read post #485 ,#487 ,and #489. Here ... The Frugalamp by OS

It is optimal for the phase to start at 0 dg , slope to a shelf of -90 / -100dg , and not dropping past that until after the unity gain point. Using these rules , I stabilized all the frugalamps and my present supersym (1 year old ).

Detailed explanation is here : The Frugalamp by OS.... Post #474.

Good info ,better sounding with no burning amps since.


OS
I haven't a clue what you mean, there is nothing wrong with my file or the way I measure open-loop gain.

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Old 8th July 2010, 06:48 PM   #109
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Andrew , here's the latest .. no text needed. Models as directive (on simulation).

Quote:
By Bigun - If so, pcb's from a vendor might be the way to go (no toner transfer).
Don't want amp of the year. Must make the prototypes (toner transfer) first to probe it to death with my scope and do an audition/tweaking.

OS
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Old 8th July 2010, 06:56 PM   #110
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To get the text out of the way right click on it and select "not visible". This hides it without changing the simulation.

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