[sdiy] Interesting Filter Idea

Jacob Watters jacobwatters at gmail.com
Tue Mar 7 19:45:57 CET 2017

Oh yes! I forgot that is how I did the LFO on that synth.

Thanks for the kind words.

For the Big Muff circuit, maybe you could switch between the clean and
filtered sound instead of switching the capacitors.

On Tue, Mar 7, 2017 at 1:39 PM, Elaine Klopke <functionofform at gmail.com>

> That's not what I was talking about, but it's cool. I was referring to the
> Low-Pass LFO section on your CMOnSter synth. I'm just guessing on the
> schematic of the filter bit.
> Here's my favorite write up and modification of the Big Muff tone circuit.
> http://www.muzique.com/lab/tone3.htm
> Also, thank you for your inspirational work!
> -Ian
> Sent from my iPhone
> On Mar 7, 2017, at 11:50 AM, Jacob Watters <jacobwatters at gmail.com> wrote:
> 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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