[sdiy] Interesting Filter Idea

[Jacob Watters]

Are you talking about this one?

http://electro-music.com/forum/viewtopic.php?t=58257

Further down I improved it to a switched resistor instead, very similar to
how the Barton filter also works (coincidence?) -
http://www.bartonmusicalcircuits.com/srv/

I don't know much about the Big Muff circuit, but you might be able to do
something similar. Just keep the switching frequency high and don't expect
perfect audio (which you probably don't from a muff effect anyway). I added
an extra filter to the end of my circuit to remove some of the switching
frequency.


-Jacob Watters

On Tue, Mar 7, 2017 at 12:33 PM, Elain Klopke <functionofform at gmail.com>
wrote:

> Hey all,
>
> I was going back through Jacob Watters article about the CMOS synth and a
> bit that I had previously passed over caught my eye...
>
> He has the signal passing through a pot (I'm assuming in one end out the
> other end) and then a switch from a 4066 connecting the wiper to a
> capacitor to ground. The 4066 switch is clocked by a simple 40106
> oscillator flipping back and forth between the plain signal and a low
> passed version.
>
> Being mildly obsessed with the tone circuit of the Big Muff Pi pedal, I
> thought it would be cool to apply this filter switching to that circuit.
> The low pass side would work the same way, putting the switch between the
> resistor and the capacitor, but I'm not sure if that would work for the
> high pass side. I don't know THAT much about the nuts and bolts of
> electronics.
>
> My other option if that doesn't work out so well in the breadboard, is to
> just put the switches in the signal path right before the filters. My
> thought was either have a separate oscillator clocking each switch or have
> one oscillator clocking one switch and then sending the same oscillator
> output to the other switch through an inverter.
>
> Thoughts? Anything glaringly stupid about the idea?
>
> -Ian
>
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