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Old 6th July 2007, 08:38 AM   #11
Dxvideo is offline Dxvideo  Turkey
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Yea its also possible.
But TI dont send free samples to Turkey (I dont know the rason).
For Linear, they already sent me a lot of free samples (like LT1210s, LT1083, LT1014) and I hesitate to request more. Theyre like National guys. Very very kind friends.
So I will buy them with my finance possibilities. I guess I can find them from futurlec or farnell.
Thx again.
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Old 12th September 2007, 01:47 PM   #12
ybserge is offline ybserge  Belarus
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Yeah, On Semi's MC33079 & Lt1210 is a neat combination from Yooree. Sounds really HONEY. Strongly recommended.

Dear Dominique, you don't have to parallel two LT1210 for 4 Ohms load at all. LT1210's peak current load capability spreads as far as to 2,2 Amps. Do not worry
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Old 12th September 2007, 05:03 PM   #13
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" ... if you not find it - recommend OPA404 (TI) , TLE2144, TLE2074 (TI) - it is free sample on www.ti.com and LT1356 (is free sample on www.linear.com) ... "

Good advise ... and if not free to Turkey, then quite inexpensive ...

....
How to get US semiconductor stuff inexpensively in the middle east = Turkey, Jordon, Israel, Pakistan, Iraq, Saudi Arabia and Persian Gulf:

1) Get a DHL or FedEx shipping account.
2) Make sure that the semiconductor item you want to get is not a "restricted" part, like a semiconductor that may be banned from export by the US military or DOD. Most semiconductor makers indicate such on their data sheets.
3) Buy your desired semiconductor parts on line and use your shipping account to indicate "recipient pays" the shipping charges and customs duties, etc..

I ship to Jordon, Israel, Turkey, Pakistan and Baghdad, Iraq regularily and Saudi Arabia and Dubia irregularily. With your own shipping account activated, the shipping costs are ultimately reduced and many local customs complications are removed.
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Old 12th September 2007, 05:12 PM   #14
jcx is online now jcx  United States
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Dominique's circuit looks fine, multiloop is a very good way to improve amplifier performance

make sure the current sharing Rs are noninductive

I would add some series impedance between the output and the speaker terminals, 1 uH air coil, maybe paralleled with a 10-20 Ohm noninductive damping R

The input op amp is important for performance, but it shouldn't be too fast without some additional compensation components - unity gain stable op amps with <10 MHz GBW should be very stable in Dominique's circuit without more compensation

I'd leave the LT1210 feedback R at 1K - this gives some “overcompensation" - slowing down the amp but making it less susceptible to ringing with load C

there is no need for + input resistors with the LT1210 - as a current feedback op amp the +/- terminals have very different impedance and input currents don't balance

The Lt1007 is fine, or a 5534 with 20 pF comp terminal cap, fet input op amps are often used too: OPA134

even the lowly TL07x have amazingly low distortion when they don't have to drive heavy loads
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Old 13th September 2007, 02:51 PM   #15
ybserge is offline ybserge  Belarus
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Dear jcx,

As to me it is more important which circuit SOUNDS fine, not just looks.
However what U wrote, I mean your last post, is really actual and valuable.
There is no need to think much over the compensation method when we speak about LT1210. The datasheed intoduces us with this.
Another thing is one has his own decision on compensation.
As he (or perhaps she ) pleases.
Sorry to say but U mentioned toooo ancient OpAmps to use for the pre. The world is spinning, the time is running those 5534 or TL07x are not the leaders novadays.
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Old 6th January 2008, 01:25 AM   #16
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Wow, I'm glad to see the topic finally interested someone! :-)
Sorry, I wasn't here for a lot of months. My girl left me, and I knew I had spent too much time in front of my computer, read too many op-amp datasheets and so on. After that, I didn't like the computer and electronics anymore, it took me too much time of my life and I didn't get back what I invested.
I mean, I used my time ineffectively...
But I want to get back to it finally - just in a more effective way - doing rather small projects and finish them quickly.
And let me say: I got helpful hints here more than once - thank you, everyone!

I once only quickly soldered a very simple version of that 1210 as a gainclone with low gain (possibly 6) after my CD player (which is rather hot) - it sounded very nice. (Though it ws a bit risky to connect my good loudspeakers after a first test, maybe )

Initially, I wanted to use them in parallel because they seemed a bit weak for 4ohms. I think I have used them with a DC of 18V for some time.
After all, I'll possibly only use a single 1210 in a small project, some tiny active speakers?

But also, those fast 1210s could be a good idea for driving the tweeters in 3-way active speakers?
Opa549 for the Bass, and a National chip for the mids, like LM1875?
Would be a funny cooperation, but I'd have to check if the usual power distribution between bass, mids and tweeter to see if that makes sense...

Well, I'm back!
Thanks, cu soon!
Dominique
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