more pics

Post by **Dave Cigna** » Sun Oct 29, 2006 2:42 pm

.....

Post by **Dave Cigna** » Sun Oct 29, 2006 3:24 pm

Sorry, these should have gone in the 'image hosting' thread. I'm a dumbass...

Post by **Dave Cigna** » Sat Mar 10, 2007 8:01 pm

Another way to lower line voltage.

Post by **Dave Cigna** » Sat Mar 17, 2007 11:03 pm

Frequency response and input impedance of a single-knob tone control for guitar amps.

Post by **Dave Cigna** » Sat Mar 17, 2007 11:28 pm

Oy vey! Another hair brained speaker enclosure. Just what the world needs...

Post by **Dave Cigna** » Sun Apr 01, 2007 11:59 am

Huh? What's this all about?

Post by **Dave Cigna** » Sat Apr 21, 2007 10:27 pm

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

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

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

hello

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

Post 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.

nickg · Post 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.

Post 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