[sdiy] NE5517

[karl dalen]

I have  used, or uses, the 13700 and philips NE5517 
and i dont see any differences! 

Is the NE5517 you have of MOT fab?

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

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
> 
>