Does anyone have experiences with the LT1210?

Dominique · 8th November 2005, 12:06 PM

Hello,

I'd like to build a quick and easy amp, that doesn't need to be high-power.
As the specs look very good, I thought about using 2 LT1210 per channel. They have better specs than the commonly used National chips, and two should give 16W at 4 Ohms. The LT1210 is a 1,1A 35MHz current-feedback 7-pin TO-220 op-amp from Linear Technology.

Did anyone already use it?

Cheers,
Dominique

err_smart · 14th April 2008, 09:08 AM

http://sound.datagor.ru/a-ti-uzhe-um...t1210--r65.htm

http://sound.datagor.ru/ms33079-lt12...haila--r17.htm

jackinnj · 14th April 2008, 04:43 PM

Using the Linear Tech model, and just using the LT1210 to drive an output the THD% is about zero.

If you are going to wrap the output about a couple of transistors then the THD% will be a lot higher --

I would like to see how the LT1210 compares with the LME49600.

jcx · 14th April 2008, 05:40 PM

I have built a single channel prototype using LT1210 (with V gain) as a power "buffer" inside a high quality fet input op amp feedback loop

Walt Jung describes the advantages of these multiloop topologies

you will probably need a "Zobel" series L || R (~ 0.5-1 uH ||~ 10 Ohm or appropriate sized lossy ferrite EMI "bead" ) at the output to keep the cfa LT1210 from oscillating with large capacitive loads - like long speaker cables

also 1 A max current into 4 Ohms is 16 W peak/or DC, only 8 Wrms for music; 8 Ohms is a better match to the LT1210 output I,V capabilities

jcx · 15th April 2008, 01:07 AM

oops messed up the math, (1 A)^2 * 4 Ohms = 4 W peak/DC => 2 Wrms

more power within the V swing capability of the LT1210 requires paralleling for higher current output - which in turn requires some current sharing arrangement - like small value power reisitors in the outputs

2x || LT1210 could put 8 Wrms into 4 Ohms
3x || LT1210 could put 18 Wrms into 4 Ohms

more than 3x || will run out of Vswing capability with 4 Ohm loads

8th November 2005, 12:06 PM	#1
Dominique diyAudio Member Join Date: Jul 2004 Location: Berlin	Does anyone have experiences with the LT1210? Hello, I'd like to build a quick and easy amp, that doesn't need to be high-power. As the specs look very good, I thought about using 2 LT1210 per channel. They have better specs than the commonly used National chips, and two should give 16W at 4 Ohms. The LT1210 is a 1,1A 35MHz current-feedback 7-pin TO-220 op-amp from Linear Technology. Did anyone already use it? Cheers, Dominique

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14th April 2008, 09:08 AM	#2
err_smart diyAudio Member Join Date: Apr 2006 Location: Tiraspol	http://sound.datagor.ru/a-ti-uzhe-um...t1210--r65.htm http://sound.datagor.ru/ms33079-lt12...haila--r17.htm

14th April 2008, 04:43 PM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Using the Linear Tech model, and just using the LT1210 to drive an output the THD% is about zero. If you are going to wrap the output about a couple of transistors then the THD% will be a lot higher -- I would like to see how the LT1210 compares with the LME49600.

14th April 2008, 05:40 PM	#4
jcx diyAudio Member Join Date: Feb 2003 Location: ..	I have built a single channel prototype using LT1210 (with V gain) as a power "buffer" inside a high quality fet input op amp feedback loop Walt Jung describes the advantages of these multiloop topologies you will probably need a "Zobel" series L \|\| R (~ 0.5-1 uH \|\|~ 10 Ohm or appropriate sized lossy ferrite EMI "bead" ) at the output to keep the cfa LT1210 from oscillating with large capacitive loads - like long speaker cables also 1 A max current into 4 Ohms is 16 W peak/or DC, only 8 Wrms for music; 8 Ohms is a better match to the LT1210 output I,V capabilities

15th April 2008, 01:07 AM	#5
jcx diyAudio Member Join Date: Feb 2003 Location: ..	oops messed up the math, (1 A)^2 * 4 Ohms = 4 W peak/DC => 2 Wrms more power within the V swing capability of the LT1210 requires paralleling for higher current output - which in turn requires some current sharing arrangement - like small value power reisitors in the outputs 2x \|\| LT1210 could put 8 Wrms into 4 Ohms 3x \|\| LT1210 could put 18 Wrms into 4 Ohms more than 3x \|\| will run out of Vswing capability with 4 Ohm loads

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