Search found 5447 matches

by mediatechnology
Fri Jul 24, 2009 1:09 pm
Forum: The Peabody Lounge
Topic: Best cities for dining?
Replies: 20
Views: 37641

Re: Best cities for dining?

I saw that too and some of the steaks at the grocery store do look better than they used to.

Eatzi's price today on Prime NY Strips was $29.95/lb.
by mediatechnology
Thu Jul 23, 2009 4:48 pm
Forum: The Peabody Lounge
Topic: Best cities for dining?
Replies: 20
Views: 37641

Re: Best cities for dining?

I went straight to the Jucy Lucy's site. Very nice. This caught my eye: Elk in Fillo on Bordelaise Sauce with spinach, pinenuts, mushrooms and goat cheese. They don't have that at Safeway :) Add this one to your Dallas lists: http://www.eatzis.com/ I've been buying (raw) Prime-graded beef at Eatzis ...
by mediatechnology
Tue Jul 21, 2009 4:50 pm
Forum: Pro Audio Design
Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Replies: 80
Views: 350014

Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp

I would like to put some voltage and current gain behind the 1646 and see how well it drives a speaker. I was in the shop last night moving stuff around and decided to give the headphone amp a listen after a few months away from it. Maybe its the headphones themselves but after about an hour of list...
by mediatechnology
Tue Jul 21, 2009 1:36 pm
Forum: Pro Audio Design
Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Replies: 80
Views: 350014

Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp

Yeah John you're right. 8V/us ought to be fast enough. At 4V/us it was still fast enough but would've required some "explaning" to the audiophools. As a headphone amp some people seem to think they need 50 V/us to swing 1-4 V p-p. It's like having a car that can do 150 miles per hour that ...
by mediatechnology
Mon Jul 20, 2009 9:07 pm
Forum: Pro Audio Design
Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Replies: 80
Views: 350014

Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp

Sam Groener's improved 2520 is only 10 V/us: http://www.sg-acoustics.ch/analogue_audio/discrete_opamps/index.html In some of my earlier tests I had measured the SR of the 1646 using common mode drive around 4V/us with the BD139/BD140 followers. After we got boards I re-checked it and it is indeed ar...
by mediatechnology
Mon Jul 20, 2009 11:35 am
Forum: Pro Audio Design
Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Replies: 80
Views: 350014

Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp

Roger -

I think it would make a good class-A transformer driver. The gain is ever so slightlyless than unity. Any required gain would need to be ahead of the 1646. The SR is only 8 V/uS or so. A 150:600 transformer would likely be the best option.

Wayne
by mediatechnology
Thu Jul 16, 2009 7:05 pm
Forum: Build
Topic: Pico II 12 Pack completed (finally)
Replies: 10
Views: 38289

Re: Pico II 12 Pack completed (finally)

Wow! This is stunning work! Love the lit meter pic, engraving knobs etc. Simply awesome.

BTW Thanks for sending me one of those meter boards. It will likely go into my Pico SE.
by mediatechnology
Thu Jul 09, 2009 10:59 am
Forum: Build
Topic: Mid Side M-S Matrix Construction Information
Replies: 121
Views: 432393

Re: Mid Side M-S Matrix Construction Information

Hi Milos - I wouldn't have those values off-hand but I might suggest something in the range of 22-47 pF. I tuned the 5532 using sqarewave response for minimal overshoot. On the board I would use the insert point just ahead of the 5532, point "G," to inject the signal. I would also suggest ...
by mediatechnology
Wed Jul 08, 2009 7:02 am
Forum: Build
Topic: Mid Side M-S Matrix Construction Information
Replies: 121
Views: 432393

Re: Mid Side M-S Matrix Construction Information

Hi flight - Yes, you can insert after the 1246 stages into B and F and skip the balanced inputs. The source impedance has to be low <<10 Ohms or it becomes part of the matrix. Use an op amp to drive the B and F inputs. Another option is to just use the 1246 as SE inputs by driving "+" and ...
by mediatechnology
Mon Jul 06, 2009 4:51 pm
Forum: Pro Audio Design
Topic: Compressor Attack Release Signature Comparisons
Replies: 4
Views: 15185

Re: Compressor Attack Release Signature Comparisons

Roger - FWIW Your Krohn-Hite 1400 also does tone bursts. You have to jump the Ramp Out to Trigger Gate In BNCs.

John - You've motivated me to dig up the 8038 function generator I designed with tone burst. That might be fun to put, along with a copy of your schematic over in Document.