Pro Audio Design Forum

A quick update 6/28/11. As I mentioned earlier, four of the 40W Sylvania snow cones just aren't bright enough. Today while shopping at Lowes I found the Utilitech (Feit Electric) LA19DIM/800/LED which is a 60W 800 lumen 3000K. I'm impressed. These babies dim very well, are bright, and don't have an ...

Two legends are no longer with us. They will be missed:

http://www.edn.com/article/518496-Analo ... stroke.php

http://www.eetimes.com/electronics-news ... c-accident

The two jumper arrangement looks right to me. Going back to the noise performance I seem to recall the numbers 34 uV, 12 uV and 8 uV for the 1606, "Cohen" symmetrical 1286 (flipped input dual diff amp), and "Birt" NJM2114 with -5.6 dB gain. I think the measurement BW was 100 kHz....

IIRC on the original proto demo board the 1606 compared to Birt using a 5532/NJM2114 was at least 10-15 dB noisier. Enough to justify re-doing the board. If you don't care about maintaining output level no matter how the dumbass customers plug in, I still recommend the simpler and more symmetrical 2...

DN-140 reference to balanced output. It's not met to be balanced/unbalanced sensing. Good basis for an A/D driver. Far, far quieter than a THAT1646, SSM2142, DRV134. The advantage is low value feedback R's which we users can't change in the 1646. http://www.thatcorp.com/datashts/dn140.pdf#page=14 We...

My coffee hasn't completely kicked in so I am having a little trouble following that output topology. It looks like opamp section B is a unity inverter literally inside the feedback loop of section A. This can be done but generally you need to worry about stability and oscillation. JR.: This the ou...

I think winter may have ended:

RF - Thanks for the update. I'm moving right now so my response is a bit delayed. While daydreaming about electronics the other day I had thought about this very circuit where multiple devices were paralleled and used to drive headphones directly. (I think I was daydreaming while mowing :D ) You thi...

We've almost caught-up on rainfall for the year but counties to the south and the drought remains unbroken. I saw a lake level report and the lowest around here IIRC was -3 ft. Lake Whitney/The Brazos River to the southwest ~60 miles was way down IIRC -14ft. I live on two creeks, one in Desoto the o...

It finally melted a few days ago.

Imagine my surprise from seeing this post replied to. Thought it might have been one of our Australian members.