[sdiy] OT - looking for roland JX10 chorus details

[Dave Kendall]

Thanks Andrew.

This will really help out.

cheers,
Dave

On Apr 22, 2012, at 07:22, Andrew Simper wrote:

> A quick analysis of the filtering around the chorus of the JX 3P: the 
> input to the chorus has a dc block at around 2 Hz followed by two 2 
> pole low pass sallen key filters that use pnp transistors for buffers 
> at around 10 kHz, the second with slightly more resonance than the 
> first to make the 4 pole total very flat in the frequency passband. 
> This is then followed by a one pole high pass (I don't know the 
> cutoff), and then a one pole low pass at around 7.5 kHz just before 
> the input to the BBD. The output has one pole passive low pass at 
> 44kHz, then another transistor buffered sallen key 2 pole low pass at 
> around 10 kHz. The Juno 106 has two 2 pole low passes on the output, 
> but they just have the one on the JX 3P.
>
> Andy
> --
> cytomic - sound music software
>
>  _______________________________________________
>  Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>