[sdiy] NE5517

[Harry Bissell Jr]

--- karl dalen <dalenkarl at yahoo.se> wrote:
> I have  used, or uses, the 13700 and philips NE5517 
> and i dont see any differences! 

Yes, so far I agree. except for the breakthrough I
mentioned...

> 
> Is the NE5517 you have of MOT fab?

I got them direct from ON semi so I guess it is MOT.

> 
> Better test it as a plain integrator with no 
> feedback  just charge the cap and see what hapends

Agreed !!!

H^) harry

> 
> KD
>  
> 
> 
> --- harrybissell <harrybissell at prodigy.net> wrote:
> > I did some initial testing with the NE5517 and
> 5517A in a simple
> > filter circuit (a modified EFM VCF1e).   This is a
> very simple SVF
> > based on the app note for the LM13600 / LM13700
> > 
> > initial findings
> > 
> > The NE5517 is a viable sub for the LM13600
> > 
> > I founf a weird effect.  At very low Iabc (when
> the filter sections
> > should be
> > cut off)... the DC level of the filter drifts down
> substantially. With
> > the LM13600
> > the sound is cut off totally, but with the NE5517
> there is a null point,
> > when the
> > Iabc goes lower, there is MORE signal
> feedthrough... perhaps some
> > capacitive
> > effect ???
> > 
> > Output drift with Iabc is about equal for LM13600
> and NE5517, the A
> > suffix is a little
> > better.  Sound wise I think they are about equal
> as well.
> > 
> > I'll get into some more formal tests when I make a
> better fixture....
> > 
> > H^) harry
> > 
> > 
>