[sdiy] What sort of filter is this?

[Graham Atkins]

I think this question came up before. Have a look at the circuit for  
the Quad 34
pre-amp (You can find it on the net). One of the controls is called  
"Tilt" and does
just that to the frequency response. You can see it here :-

http://www.retrohifi.co.uk/quad%2034_44.html

Graham

On 8 Jan 2010, at 14:20, George Hearn wrote:

> A Baxandall Tone Control Circuit has two knobs, one bass "cut- 
> neutral-boost"
> and one "treble-neutral-boost".  If you were to use a dual-gang
> potentiometer you could connect it such that at one end you have  
> bass cut &
> treble boost, in the middle you have neutral-neutral and at the  
> other end
> you have bass boost/treble cut. This would achieve the desired  
> effect but
> would boost the other when one was cut, however this might be useful.
> George
>
> An example Baxandall circuit can be found at:
> http://sound.westhost.com/dwopa2.htm
>
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Mike  
> Beauchamp
> Sent: 08 January 2010 14:04
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] What sort of filter is this?
>
> Excuse me if I get a few of the terms wrong here, but what sort of
> filter is neutral at it's middle position and then a high-pass and
> low-pass filter on either end?
>
> The reason I ask is that I'm looking for an analog variable filter to
> add in the feedback path of a delay... I'd like to be able to have a
> single knob where the centre position is basically unaffected and I
> can either cut bass or cut treble. I'm not too sure if I'd want
>
> Maybe I can even go a simple route and do it all passively somehow?
> (Maybe with a centre-tapped pot, or dual gang pot?)
>
> -- 
> Mike Beauchamp
> http://mikebeauchamp.com
> mobile: +64 21 0 AS I BIKE (2742453)
> home: +64 4 801 8304
> work: +64 4 915 4068
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