Substitute for M5218L ?

[R@F]

> Hi,
>     I am thinking about cloning a few of the TR909 circuits, or even the
> whole thing. I've not looked at the schems in great detail yet, but a lot
of
> the op-amps seem to be M5218L. This device seems to be still available in
> one catalogue of mine though I have not confirmed its availability. My
> question is, is there anything special about this IC, and can anyone
suggest
> a more modern IC that I could use in its place? I was wondering if
something
> basic like a TL07x type IC could be used, or if something a little better
> would be needed. As far as I understand, the M5218L is just a basic
> low-noise opamp.
>
> Many thanks - any advice very much appreciated.
>
> Trev



You're right!! The M5218L (Mitsubishi) is just an ordinary low noise opamp.
According to the input noise voltage of 2,0µV it's even more noisy than the
standard NJM4548, which has "just" 1,4µV (referring to both datasheets).
Besides there's nothing special about this opamp. You can use the TL0xx of
course but the 5218 is often a bit cheaper than the TL072. If you want to go
100% original, use the 5218 though there's absolutely no need. The NE5534(A)
is a good choice too.
I'm currently working on a 808/909 Bass Drum clone with tons of
modifications. The opamp I'm using for it is the NJM4580 - my favourite
opamp. The problem is that it's a bit hard to find. And it's a bit
expensive. Check it out at www.njr.com

greets

R at F
http://raf909.notrix.de