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Velts.
Joined: Jun 13, 2008
Posts: 4
Location: Estonia
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 Posted: Fri Jun 13, 2008 6:34 am Post subject:
LPF
Subject description: An idea. |
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Okay, i didn't know where to post this, so less hate if it's in the wrong section.
I play guitar and bass, recently i've been starting to take a closer look at DIY effect pedals. I had this idea: A Low Pass Filter built in a Wah-case, the cutoff would be controllable via the expression pedal. A resonance add-on would also be nice. Is this achievable? |
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DrJustice
Joined: Sep 13, 2004
Posts: 2112
Location: Morokulien
Audio files: 4
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Posted: Fri Jun 13, 2008 7:08 am Post subject:
Re: LPF
Subject description: An idea. |
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Hi Velts!
 to electro-music.com!
What you ask about is indeed achievable. It is very easy to use the potentiometer in the pedal to control cutoff frequency and/or resonance, provided that the filter you choose has voltage control of those parameters. There are lots of filter circuits in the DIY community that would fit this project just fine. Do you have any particular variety in mind? If not, I'm sure other EM members can recommend a suitable filter, possibly with a ready made circuit board or even as a complete kit (a good starting point if you are just beginning with DIY effects).
BTW: here's a nice wha-wha tech link.
DJ
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Velts.
Joined: Jun 13, 2008
Posts: 4
Location: Estonia
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| Posted: Sat Jun 14, 2008 1:14 am Post subject:
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| Well, something moogish would be very nice, im talking about a fat sounding LP. |
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Coriolis
Joined: Apr 11, 2005
Posts: 616
Location: Stilling, Denmark
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Velts.
Joined: Jun 13, 2008
Posts: 4
Location: Estonia
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| Posted: Mon Jul 21, 2008 8:46 am Post subject:
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Well, I suppose I'm not going to want several inputs or envelope capabilities, would someone strip down the circuit so that it only has cutoff and resonance controls?
Thanks in forward.
EDIT: How cute, i ran a search for the components and no electronics-specialised store has the TL072-s.
Plus it'd be a pain building an unipolar 15V power supply.. |
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widdly
Joined: Jun 25, 2007
Posts: 268
Location: singapore
G2 patch files: 2
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| Posted: Mon Jul 21, 2008 10:45 pm Post subject:
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I built the wasp filter into an expression pedal. It runs of a battery and does low pass and high pass. It's a pretty easy build.
Schematic here..
http://www.uni-bonn.de/~uzs159/waspfilt.png
If your electronics store doesn't stock TL072's then it is time to find a new electronics store.
Last edited by widdly on Thu Aug 05, 2010 10:11 pm; edited 1 time in total |
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Coriolis
Joined: Apr 11, 2005
Posts: 616
Location: Stilling, Denmark
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Velts.
Joined: Jun 13, 2008
Posts: 4
Location: Estonia
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| Posted: Thu Jul 24, 2008 10:30 am Post subject:
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| widdly wrote: | I built the wasp filter into an expression pedal. It runs of a battery and does low pass and high pass. It's a pretty easy build.
Schematic here..
http://www.uni-bonn.de/~uzs159/waspfilt.png
If your electronics store doesn't stock TL072's then it is time to find a new electronics store. |
The problem is, there are two online electronics stores in Estonia and neither one has them! |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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Posted: Thu Aug 14, 2008 8:16 am Post subject:
Re: LPF
Subject description: An idea. |
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| Velts. wrote: | Okay, i didn't know where to post this, so less hate if it's in the wrong section.
I play guitar and bass, recently i've been starting to take a closer look at DIY effect pedals. I had this idea: A Low Pass Filter built in a Wah-case, the cutoff would be controllable via the expression pedal. A resonance add-on would also be nice. Is this achievable? |
I mean no disrespect to your idea, however, it seems that what you're proposing is essentially what a Wah-Wah pedal already is, a Filter inside a manual-pedal case. If it's the manual resonance control that you'd like to add, i know that that some wah-wahs use a trim pot to fix the res at a certain level. You could replace this trim with an external pot. |
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doctorvague
Joined: Mar 14, 2007
Posts: 281
Location: new mexico
Audio files: 2
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Posted: Thu Aug 21, 2008 6:30 am Post subject:
Re: LPF
Subject description: An idea. |
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| ericcoleridge wrote: | | Velts. wrote: | Okay, i didn't know where to post this, so less hate if it's in the wrong section.
I play guitar and bass, recently i've been starting to take a closer look at DIY effect pedals. I had this idea: A Low Pass Filter built in a Wah-case, the cutoff would be controllable via the expression pedal. A resonance add-on would also be nice. Is this achievable? |
I mean no disrespect to your idea, however, it seems that what you're proposing is essentially what a Wah-Wah pedal already is, a Filter inside a manual-pedal case. If it's the manual resonance control that you'd like to add, i know that that some wah-wahs use a trim pot to fix the res at a certain level. You could replace this trim with an external pot. |
Yes but a wah-wah is a bandpass filter, yes-no? I've run guitar through LPF's using a pedal interface and it sounds different than a wah pedal for sure. Especially if you had a resonance control...
cheers
Phil |
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widdly
Joined: Jun 25, 2007
Posts: 268
Location: singapore
G2 patch files: 2
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| Posted: Thu Aug 21, 2008 9:25 pm Post subject:
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guitar -> distortion pedal -> swept resonant high pass
This sounds very cool, especially as build up before switching out the filter for and having the drums drop in. |
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