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Old 8th January 2013, 10:25 PM   #11
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Location: Suceava
I'm a beginner so please correct me if I did something wrong
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Old 8th January 2013, 10:34 PM   #12
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Quote:
Originally Posted by adytzu22 View Post
its just for simulating in LTSpice ... R1 and R4 are dummy-loads
OK, thanks for explaining.
I'm a beginner myself, hopefully somebody more experienced can share his/her view.
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Old 8th January 2013, 10:48 PM   #13
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tkx
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Old 9th January 2013, 12:22 AM   #14
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I’d put it in this way.
Separated inputs will allow to take signal due Y-splitter in parallel with amp for component speakers. Though, there always is risk to catch the ground loop noise when connecting two inputs with different ground topology.
I thought about op275 with FET differential , LT1313 should fit too.
Input.png
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Old 9th January 2013, 07:09 AM   #15
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It doesn’t like, but by LT1113 datasheet’s recommendation there is possibility you will need in parallel capacitors 27pF with R5,R6 and R13 resistors
OP275 works without them , it was checked by practice.
For OP275 , if you plan to use it with signal higher than 4V RMS it would be better to put 10k resistor in series with input capacitors. First order high pass C1R7 and C2R8 goes off ,but it is better than clipping.
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Old 9th January 2013, 11:30 AM   #16
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Default OpAmp LM324

I'm using LM324 quad whit 2V RMS signal
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Old 9th January 2013, 01:22 PM   #17
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Click the image to open in full size.
http://www.diyaudio.com/forums/galle...php?photo=7933

this is the final version... pls give feedback so I can start building it... tkx

Click the image to open in full size.
http://www.diyaudio.com/forums/galle...php?photo=7934

Last edited by adytzu22; 9th January 2013 at 01:25 PM.
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Old 9th January 2013, 08:45 PM   #18
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It should work.
Those lm324 they are good for sub, but I don’t know how they are for music.
I suspect they are a bit noisy and possible not very quick for modern standards.
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Old 9th January 2013, 08:47 PM   #19
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Default TL074 ?

what about TL074?
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Old 9th January 2013, 09:39 PM   #20
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These were widely used in car amps they are good to use.
Take a look on “eserviceinfo.com” manuals for car amps it will give you idea how they are designed.
You can copy their isolation buffer how it is. In my opinion, most successful but most complex buffers have Alpine amps.

In addition to your schematics.
For safety of your signal source it would be better to put 2kOhm resistors on positive inputs of U1, U2, U9, U15.
To be more precise, R5||R6 is part of R8 resistance for filter. Take 12k for all of them(R5 R6 R8), it will give you total 18k.
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