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Old 17th August 2013, 04:41 PM   #4271
davada is offline davada  Canada
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Default Combining PDF's

Perhaps Jan, Scott or others could suggest something for the following.
My Schematic capture software generates multiple sheets. When I go to print the sheets to PDF using Bullzip, Bullzip generates individual PDF files. Is there a free tool that can assemble the PDF's into one PDF and organize it like what you would find in a multi page manual?
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Old 17th August 2013, 04:57 PM   #4272
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Yes. Pdf995. Available free here:

pdf 995: create PDF documents easily for free
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Old 17th August 2013, 05:00 PM   #4273
davada is offline davada  Canada
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Originally Posted by michaelkiwanuka View Post
Yes. Pdf995. Available free here:

pdf 995: create PDF documents easily for free
Thanks Mike.
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Old 17th August 2013, 05:03 PM   #4274
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Michael,
Thanks for the link for the PDF suite. If I was to do that I would just pay the few dollars so I don't have another link adding advertisements to my browser.
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Old 17th August 2013, 05:14 PM   #4275
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You're welcome.
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Old 17th August 2013, 06:25 PM   #4276
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Quote:
Originally Posted by michaelkiwanuka View Post
Yes. Pdf995. Available free here:

pdf 995: create PDF documents easily for free
Indeed, that's also what I use for that.
Also allows you to string a bunch of JPGs into one PDF document.

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Old 18th August 2013, 01:45 AM   #4277
davada is offline davada  Canada
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That is really quite a cool suite. And inexpensive too.
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Old 30th August 2013, 12:10 PM   #4278
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I was looking through the LTSpice changelog and I found that the HiSiM-HV model has been added. I haven't been able to find very accessible info, but according to this it seems that it supports subthreshold conduction:

Quote:
Subthreshold Swing Parameters
Parameter Name Default Range min Range max Description Unit
PTHROU 0 0 50m correction for subthreshold swing -
SPICE Model Parameters for the HiSIM2 model - IC-CAP 2012 -Agilent EEsof Knowledge Center

EDIT: But according to the bottom of the page that parameter was actually removed later on. Maybe the newer parameters work better? Or did they just ruin the model?

Last edited by keantoken; 30th August 2013 at 12:13 PM.
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Old 16th September 2013, 10:39 AM   #4279
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I have recently purchased Bob's designing Audio Power Amplifiers to learn more about this hobby I'm interested. This may seem like a dumb question to many here, but....
On page 60 the second paragraph mentions using the darlington VAS circuit "The inclusion of Q12increases the input impedance of the new vas to about 40KOhm"

Could someone please show me mathematically how the figure of 40kohm input impedance was reached?

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Simon
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Old 16th September 2013, 12:04 PM   #4280
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Originally Posted by niss_man View Post
I have recently purchased Bob's designing Audio Power Amplifiers to learn more about this hobby I'm interested. This may seem like a dumb question to many here, but....
On page 60 the second paragraph mentions using the darlington VAS circuit "The inclusion of Q12increases the input impedance of the new vas to about 40KOhm"

Could someone please show me mathematically how the figure of 40kohm input impedance was reached?

Regards

Simon
Hi Simon,

Thanks for buying my book and I hope you enjoy it.

Q12 functions as an emitter follower stage. If an emitter follower transistor has a current gain of 100, the input impedance seen at its base will be roughly 100 times that seen by its emitter. This is because the signal voltages at the input and output of the EF are nearly the same, while the base signal current is about 1/100 that of the emitter signal current.

In Figure 3.7, the emitter of Q12 sees a load of 470 ohms in parallel with the load seen at the base of Q4. If Q4 has a current gain of 100, the load seen looking into its base would be on the order of 100 times the value of its emitter resistor of 22 ohms, or about 2200 ohms. So the load seen by the emitter of Q12 is roughly equal to the parallel combination of 470 ohms and 2200 ohms, which is about 390 ohms. That multiplied by 100 is almost 40k ohms.

Cheers,
Bob
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