Substitute for M5218L ?

[Fraser, Colin J]

> -----Original Message-----
> From: Trevor Page [mailto:trevor at resonance.fsnet.co.uk]
> Sent: 07 December 1999 18:27
> To: synth-diy at mailhost.bpa.nl
> Subject: Substitute for M5218L ?
> 
> 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 
> 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.

All the circuits certainly work with TL07x.
I used these for all the op-amps in the 808 and 909 circuits.

There is a noticeable difference in sound - the high end is improved by the
newer op-amps.
You probably wouldn't spot the difference without a/b-ing the clone and the
real thing.
I actually prefer the brighter sound as it has more presence, and you can
always roll it off if you want 'authenticity'.

If you haven't found it already, details of my drum module are at
http://www.octavo.demon.co.uk/colinf/tr909/my909.htm


Colin f