[sdiy] MS20 rev1 2 pole high pass

[aankrom]

This post made me think about how all the filters I've built or want to 
build are resonant low-pass filters. I think I should broaden my 
horizons.

AA


On Mon, 30 Apr 2012 22:59:17 +0800, Andrew Simper wrote:
> I've come up with a design for a 2 pole high pass MS20 rev1 style
> transistor core filter. Has anyone heard of such a thing before? I'm
> guessing so because it was pretty easy to do, just take the ms20 rev1
> low pass, swap the transistors for the caps like you do for a regular
> sallen key, and also change the transistors to pnp and then feed the
> negative control voltage to them. You also need to put a buffer
> between the two stages, but other than that the opamp and resonance
> side of things can stay the same.
>
> I've not yet built the circuit, but I've done a model of it and made
> an audio demo here:
>
> www.cytomic.com/files/thedrop-one-sided-tranny.mp3
>
> For this demo I took the output pre final diode clipper, which is 
> easy
> to do in software.
>
> Andy
> --
> cytomic - sound music software
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