TL084CN vs AD731

[fossil2k]

Hey guys, I'm trying to modify my pre-amp using TI084CN to AD731. Except from comparing the specifications, I'm not sure if the AD731 will fit as a direct replacement to TI084CN without any modifications to other components or values used. Can anybody enlighten me please?

 

[x-pro]

What is AD731?

Cheers

Alex

 

[jan.didden]

Maybe he means AD713. The 713 and the TL084 are both fet-input quads several decades old. They were two companies' answer to each other, and are very similar. If you want to update, take something a few generations more recent

Jan Didden

 

[Leolabs]

In the datasheet stated that:"Enhanced Replacement for LF347 and TLO84."

 

[KSTR]

OPA4134

- Klaus

 

[fossil2k]

Thanks for the reply. It is indeed AD713 and I'm still unsure if I should change to AD713. I mean, do I need to do any other modifications to the circuitry or just do a direct replacement to TL084CN?? Any better idea on what chips to use?

 

[djk]

"OPA4134"

No longer available in a DIP.

 

[jan.didden]

In the datasheet stated that:"Enhanced Replacement for LF347 and TLO84."

Of course it said, this is marketing of course.
The 713 is also decades old, and that recommendation is probably from the 80's?

Get something really better.


Jan Didden

 

[fossil2k]

Thanks djk..OP3134 is only available in SMD..now have to think of the problem of sourcing a PCB that allow me to convert SMD into DIP.

 

[djk]

I suggest two dual SMD types, one on either side of an adaptor board.

http://www.futurlec.com/PCBService.shtml

will do a good price on a small order, the only thing left to find is pins to go from the adaptor board to the original 14 pin DIP holes.

 

[fossil2k]

djk, thanks for the info.

 

[fossil2k]

Is it worth to change LM339N to CMP04? Will there be any sonic improvement? I've recently replaced my CDP NJM2114 to AD8065 and is very satisfy with the result. I'm now thinking of changing the NE5534N to AD8065 as well. Is there any better suggestion?

 

[QSerraTico_Tico]

Better than better?

OPA2134 better???
Hahaha just as LM4562........... better than all

 

[fossil2k]

So guys, any advise to change to CMP04??

 

[fossil2k]

Look at LME49740 which is a quad op-amp and its designed specifically for hifi..worth a try??

 

[fossil2k]

Basic to some basics..OPA2134 is a dual op-amp and if I were to use only one of them..do I need to shunt a resistor across its inputs & output or I just leave them floating??

 

[djk]

It's not an FET input, but depending on the application it may work (input bias is much lower than previous BJT input opamps).

 

[carlmart]

Sorry guys. Everything will depend on the source level to find a difference between any quad IC designed in the '80s or '90s.

The AD713 comes from the late '80s, and it's still considered one of the best there is. So I think it will all depend of the implementation.

The AD713 is better than the TLO84 though, and certainly more modern.

Now if you will compare a quad with single chips or even some dual ones, then that's different. You will find many chips around, DIP or SMD that will certainly improve on any quad.

 

[circuitscc]

How about using OPA4227? Very low noise and distortion.
Regards.

 

[fossil2k]

Should I shunt the inputs & output with resistors is 1 op-amp is not used in a dual op-amp package??