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Topic review
   

Expand view Topic review: more pics

by dave slagle » Sun Mar 08, 2009 7:14 pm

nnn
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Picture 12.png
Picture 12.png (46.57 KiB) Viewed 9820 times

DC PP

by dave slagle » Sun Feb 01, 2009 3:13 pm

nt
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DC PP mp.jpg
DC PP mp.jpg (53.49 KiB) Viewed 9881 times

by dave slagle » Wed Dec 31, 2008 5:02 pm

jj
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Picture 7.png
Picture 7.png (36.71 KiB) Viewed 9997 times

by dave slagle » Sun Dec 28, 2008 9:17 pm

sas
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Picture 7.png
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nm

by dave slagle » Sun Dec 28, 2008 7:31 pm

nm
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IMG_4835.jpg
IMG_4835.jpg (77.47 KiB) Viewed 10027 times

by dave slagle » Fri Dec 26, 2008 5:10 pm

no
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had to borrow some public space....

by JeffreyJ » Sat Dec 20, 2008 6:52 pm

fighting for art....
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carder.jpg
carder.jpg (49.66 KiB) Viewed 10074 times

nothing to see here

by dave slagle » Fri Aug 15, 2008 1:04 am

move along.
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Picture 6.png
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satoshi.jpg
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amp

by dave slagle » Sun Aug 10, 2008 2:20 am

amp
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Picture 4.png
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nmnm

by dave slagle » Sat Jul 26, 2008 10:54 pm

nm
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Picture 2.png
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nm

by dave slagle » Sat Jul 26, 2008 9:05 pm

nm
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Picture 1.png
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15E

by dave slagle » Mon Mar 31, 2008 2:08 am

poor guy... sniff...
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sut

by dave slagle » Wed Dec 26, 2007 2:53 am

nothing to see here... move on.
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Picture 1.png
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by dave slagle » Sat Dec 22, 2007 4:23 am

sorry for this one.
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loops

by dave slagle » Mon Nov 26, 2007 2:09 pm

nt
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Picture 3.png
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an amp

by dave slagle » Sun Nov 18, 2007 5:26 am

nothing to see here move on...
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DC PP mp.jpg
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by Dave Cigna » Fri Nov 09, 2007 11:53 pm

weekly quiz
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SimplifiedOscillator.png
SimplifiedOscillator.png (6.53 KiB) Viewed 65784 times

by Dave Cigna » Sun Nov 04, 2007 11:25 am

What you get when you use am output coupling cap on your preamp: DC voltage at the output until the cap charges...
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OutputCouplingCap.png
OutputCouplingCap.png (2.04 KiB) Viewed 65821 times

mospice

by dave slagle » Thu Sep 20, 2007 12:50 am

nt
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stuff

by dave slagle » Tue Sep 18, 2007 10:06 pm

nt
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by dave slagle » Fri Aug 17, 2007 2:45 am

i'd tell ya, but then i'd need to kill ya.
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what did i do.jpg
what did i do.jpg (47.01 KiB) Viewed 66035 times

by Dave Cigna » Wed Aug 08, 2007 3:55 pm

like the panty line of history
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by Dave Cigna » Mon Aug 06, 2007 3:28 pm

n
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out_LTP.gif
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cathode_LTP.gif
cathode_LTP.gif (13.64 KiB) Viewed 66457 times

by Dave Cigna » Wed Aug 01, 2007 11:24 pm

. .
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LTP.gif
LTP.gif (7.82 KiB) Viewed 66516 times

by Dave Cigna » Wed Jun 20, 2007 11:29 am

Hi nick, no I haven't looked at more complex filters, though it is easy enough for anyone to do in SwCAD/LTSpice.

The graphs do seem frightening, but I'm not sure they're as fierce as they look. The 10H/100uF case feeding a stage with a 10k load resistor would result in 0.07dB boost at 20Hz. The other combination might be a little more dangerous, but people report that it sounds good overall, so who am I to argue with that? :)

If you hadn't already figured it out, the posts I put in this thread are just a way to host images that I link to in threads on other forums that don't allow uploading images. I could (maybe should) use imageshack.com or something like that instead. I add a short description here because I know people will look and they might be curious what they're looking at.

-- Dave

by nickg » Wed Jun 20, 2007 6:47 am

I must admit both of the previous (interesting) graphs are why I have been spending a lot of time building and listening to amps with various regulated supplies.

Have you tried the same sort of thing but with a two stage filter? I found it very hard to convince myself that the variations of impedence with freq was a good thing.

by Dave Cigna » Tue Jun 19, 2007 5:27 pm

The impedance of a LC filter section in a power supply as viewed from the amp's perspective looking backwards up the supply. Assumes zero impedance upstream of the filter.
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10H choke and 100uF capacitor. DCR of choke is unimportant for reasonable values.
10H choke and 100uF capacitor. DCR of choke is unimportant for reasonable values.
10H100uLC.gif (10.55 KiB) Viewed 66778 times
LC filter with 320mH choke (10 ohm DCR) and 45uF capacitor
LC filter with 320mH choke (10 ohm DCR) and 45uF capacitor
320mH10ohm45uLC.gif (11.19 KiB) Viewed 66778 times

hhhh

by dave slagle » Tue Jun 05, 2007 2:59 am

hhh
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h

by dave slagle » Fri Jun 01, 2007 12:22 am

hello
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pics

by dave slagle » Mon May 07, 2007 6:35 pm

pics
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Picture 6.png
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Picture 5.png
Picture 5.png (23.29 KiB) Viewed 67085 times

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