[dokebi]

I have 2 NEC opamps but I cant find any information on it. Has anyone ever used them or heard of them before?

 

[tangent]

Here's a list of op-amps NEC makes: http://www.necel.com/linear/english/...t_list_op.html

Find out which one you have, and get the datasheet to start getting an idea of what kind of beastie you have there. I wouldn't be surprised if you have a clone of a common op-amp like the uA741, LM358, or TL0[78]2. I wouldn't be surprised if NEC doesn't make anything original -- they may well just be giving over some of their fab capacity to second-sourcing efforts.

 

[dokebi]

The markings on the 2 I have are:

nec japan
C4570C 1
9344D01

closest match is µPC4570 on the site. Are these suitable for making an amp? And much thanks for the link Tangent.

I also have a TL082 dual bifet and a LM386 400mw audio amplifier.

 

[tangent]

That chip looks to be worse than the TL082, which is barely suitable for audio use in modern equipment. Once upon a time, it might have sufficed, but today there are so many chips that are better for just a few dollars that there's little point in using such a weak chip.