how to connect two single opamp into dual?

I know the pins of dual opamp.
I'm trying to connect two single LT1028 into dual, but there are Vos TRIM at pin1 and pin2, and OVER-COMP at pin5. Can I leave it not connected?

I also found that some people said it need 0.1uF cap at input or..? to prevent oscillation. how do I know whether it is oscillate without oscilloscope?
 
I know the pins of dual opamp.
I'm trying to connect two single LT1028 into dual, but there are Vos TRIM at pin1 and pin2, and OVER-COMP at pin5. Can I leave it not connected?

I also found that some people said it need 0.1uF cap at input or..? to prevent oscillation. how do I know whether it is oscillate without oscilloscope?

None of that info was in your original post, so what kind of answer did you expect?

The Vos trim pins are 1 and 8, not 1 and 2. Will you need these?

Did you read the datasheet to learn what OVER-COMP is used for? Will you need this?
 

qingcong

Member
2011-01-08 3:40 pm
I have made a dual mono to single dual adapter.
How do I know or what are the symptoms of oscillation?
Can I hear it? or..? I do not have a scope here.


Most of the time, people put a 100nF cap between the Vcc and GND pins on the opamp. The cap is placed as close to the pins on the opamp so that high freq noise is bypassed to GND instead of entering your opamp.
 
@andrewT
Yes. I had downloaded the datasheet, read it again and again.
I'm new and major in electronic, not really good in telecommunication(analog).
so looking for peoples opinion who have done the compensation to their lt1028 before I do any thing, as I don't know whats happening in that opamp.

My apologies if any thing bothering you. :)
Still learning about the analog.
 
bothering me? No.
Members repeatedly advise that the manufacturer's advice be followed for opamp decoupling.
Members repeatedly advise that swapping opamps does invite "new" problems.
Members repeatedly advise choosing opamps that are suitable for the duty.

Have you looked at decoupling?
Have you looked at what the original dual specification was and how your replacement singles will match that specification?
Have you looked at the gain and stability issues for the original and the replacements?
 
Ok. This is the 1st time I use the HOLMImpulse. Leave most the settings to default.

[IMGDEAD]https://i290.photobucket.com/albums/ll265/VincentChang88/1028.jpg[/IMGDEAD]

Is it ok for this frequencies response? btw, what to use to measure if there is a overshoot?

I also checked the frequency by using Alta's spectrum analyzer, the LM4562 17kHz dB much lower than 1kHz. and LT1028 17kHz~19kHz is more audible.