more pics

your own private (or public place) to document whatever.
Dave Cigna
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more pics

Post by Dave Cigna »

.....
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SplitSupply1.gif
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SplitSupply2.gif
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Dave Cigna
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Post by Dave Cigna »

Sorry, these should have gone in the 'image hosting' thread. I'm a dumbass...
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VoltageBucking.gif
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Dave Cigna
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Post by Dave Cigna »

Another way to lower line voltage.
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VoltageBucker.gif
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Dave Cigna
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Post by Dave Cigna »

Frequency response and input impedance of a single-knob tone control for guitar amps. :shock:
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FreddysTilt.gif
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Dave Cigna
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Post by Dave Cigna »

Oy vey! Another hair brained speaker enclosure. Just what the world needs...
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K-TrapFrontView.gif
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K-Trap.gif
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Dave Cigna
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Post by Dave Cigna »

Huh? What's this all about?
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Dave Cigna
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Post by Dave Cigna »

A page from Ghirardi, Radio Physics Course (a FUN book) outlining the Miessner 'tapped choke.' View Miessner's patent on Google Patents.
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MiessnerTappedChoke.jpg
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dave slagle
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pics

Post by dave slagle »

pics
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Picture 6.png
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dave slagle
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h

Post by dave slagle »

hello
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hhhh

Post by dave slagle »

hhh
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Dave Cigna
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Post by Dave Cigna »

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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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 66458 times
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 66458 times
nickg
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Post by nickg »

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.
Dave Cigna
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Post by Dave Cigna »

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
Dave Cigna
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Post by Dave Cigna »

. .
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Dave Cigna
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Post by Dave Cigna »

n
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out_LTP.gif
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SpiceLTP.gif
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Dave Cigna
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Post by Dave Cigna »

like the panty line of history
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dave slagle
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Post by dave slagle »

i'd tell ya, but then i'd need to kill ya.
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dave slagle
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stuff

Post by dave slagle »

nt
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dave slagle
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mospice

Post by dave slagle »

nt
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Picture 8.png
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Picture 7.png
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Dave Cigna
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Post by Dave Cigna »

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
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Dave Cigna
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Post by Dave Cigna »

weekly quiz
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dave slagle
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an amp

Post by dave slagle »

nothing to see here move on...
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dave slagle
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loops

Post by dave slagle »

nt
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dave slagle
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Post by dave slagle »

sorry for this one.
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dave slagle
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sut

Post by dave slagle »

nothing to see here... move on.
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dave slagle
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15E

Post by dave slagle »

poor guy... sniff...
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dave slagle
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nm

Post by dave slagle »

nm
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nmnm

Post by dave slagle »

nm
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dave slagle
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amp

Post by dave slagle »

amp
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dave slagle
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nothing to see here

Post by dave slagle »

move along.
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