[sdiy] op amp substitutes

[jays at aracnet.com]

One thing that could be a major problem is that 5532's take a lot more current than most modern op-amps. So if you are putting in a bunch they may drag the power supply down. Might look at NJM2068s.

Jay S.

Anthony <aankrom at bluemarble.net> wrote :

> ----- Original Message ----- 
> 
> >I agree with almost everything you said...
> >
> > (but :^)
> >
> > The 4558 is not THAT bad of an opamp.  Even the 741 has its uses. Why do
> 
> > you
> > think that they have not been replaced and are still around.
> 
> 
> Oh I said it was 'technically crappy'. From me that translates to "The 
> datasheet doesn't add up to what I've seen in real world applications. I 
> took apart a Sony boom box and the preamp was it's own little unit. It used 
> a 4558, I took of the worn out slider pots and it's good for a phono preamp.
> 
> I even used the EQ on it for the RIAA thing. I was going to swap in a 5532, 
> but I think I'll swap in a JRC version in place of the NEC one that's in 
> there.
> 
> > The 741 is extremely rugged. It is NOT fast, that is a virtue in some 
> > cases. In
> > a lot
> > of circuits if you use a FASTER opamp it will become unstable.
> 
> I haven't run into many 741's oddly enough. Seems like most equipment uses a
> 
> 1458 or a 358 and especially 324's which is kind of weird. It could be 
> possible that I simply overlooked the 741's and 1458's when I desoldered 
> stuff.
> 
> 
> I like it that sometimes a slow op amp is good.
> 
> > I once tried to replace the 4558 in the 360 Systems
> "Slavedriver" thinking
> > 1) it was a brother of the 1458 (not - it is MUCH better)
> > 2) I could EASILY find a superior replacement.
> 
> I thought the same thing! I found like 20-25 of them in with my 1458's when 
> I did a little op amp inventory the other day.
> 
> > I was wrong. I could not easily find a lower noise opamp.  The 5532 comes
> 
> > close
> > with lower noise, much higher current, and pretty bad offset voltage 
> > problems...
> 
> Good to know these pitfalls before hand I had planned to substitute 5532's 
> for another one.
> 
> > The LM324 is a different animal.  While for SH!T in audio, it is very 
> > useful in
> > single
> > supply applications.  I even use and stock them... and they are on my BBD
> 
> > list
> > :^P
> 
> An old electronic drum, the DR7 and also the DR8 used 324's all over the 
> place.