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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  MXR Envelope Filter subtle? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: MXR Envelope Filter subtle?  (Read 634 times)
Bernardduur
Posts: 1482


Rogier K; Netherlands


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MXR Envelope Filter subtle?
« on: May 15, 2006, 11:40:29 AM »

OK, I build one and it works great! One down side: it has a volume drop and is quite subtle. Is this normal?
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zeta55
Posts: 327


Krister Östman


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Re: MXR Envelope Filter subtle?
« Reply #1 on: May 15, 2006, 12:16:16 PM »

Check out the build reports from the tonepad site, there's some mods to cure the volume drop there....At least I think so.
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Bernardduur
Posts: 1482


Rogier K; Netherlands


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Re: MXR Envelope Filter subtle?
« Reply #2 on: May 15, 2006, 02:50:02 PM »

Yes, I've done them, but then still is the effect a bit subtle

Maybe its normal; I never played with one before
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Mark Hammer
Posts: 21501


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Re: MXR Envelope Filter subtle?
« Reply #3 on: May 15, 2006, 03:06:02 PM »

It never quite reaches the most outrageous sounds of a Mutron but it is NOT subtle.  Possible the Q setting is wrong or a problem?  Possible it's not the "right" 4069?
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zeta55
Posts: 327


Krister Östman


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Re: MXR Envelope Filter subtle?
« Reply #4 on: May 15, 2006, 03:09:25 PM »

Well, I built one, did a few of the mods, reverse swep, and some cap change for bas responce. Don't really remember, but I do remember it doesn't suffer a volume drop.

/Krister
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Bernardduur
Posts: 1482


Rogier K; Netherlands


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Re: MXR Envelope Filter subtle?
« Reply #5 on: May 15, 2006, 04:10:40 PM »

OK, I noticed that I needed to add some push to the signal to make it work but this I already knew.

Without the push (tubescreamer or other pedal) it doesn't wah
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zeta55
Posts: 327


Krister Östman


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Re: MXR Envelope Filter subtle?
« Reply #6 on: May 15, 2006, 11:31:58 PM »

It should wah without the TS. I usualy put mine first in the pedalchain.

/Krister

OK, I noticed that I needed to add some push to the signal to make it work but this I already knew.

Without the push (tubescreamer or other pedal) it doesn't wah
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Bernardduur
Posts: 1482


Rogier K; Netherlands


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Re: MXR Envelope Filter subtle?
« Reply #7 on: May 16, 2006, 03:28:05 AM »

OK, it works; not following the mods as told on the tonepad site, because they will destroy the feeling. Just leave the 62k and the 100k as the bias and it works great.

My main problem were the IC's. I used ST 4069's and only when I replaced them with Philips versions, it came alive. I had some wah with the ST's, but with the Philips the wah got more pronounced.

The volume drop is now partly fixed, but I am satisfied. I replaced R2 with 100k, C4 with 0,01 µf.

Nice mod: replace R1 with a 5k pot (or in my case a trimpot); this make the whole effect more intense
« Last Edit: May 16, 2006, 04:01:29 AM by Bernardduur » Logged

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rhodes
Posts: 3


Re: MXR Envelope Filter subtle?
« Reply #8 on: May 16, 2006, 04:07:49 AM »

    If you think you want more volume, you can alter the gain in one of the op-amps either at the input stage or at the output stage. I often substitute pots for feedback of op-amps to have gain control in most of the circuits which do not have volume level controls.
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warioblast
Posts: 175


Re: MXR Envelope Filter subtle?
« Reply #9 on: May 18, 2006, 03:50:44 PM »

http://www.techniguitare.com/forum/viewtopic.php?t=239&postdays=0&postorder=asc&start=0 Yeah I know it's French...
Basically, the guy had a volume drop too and fixed it with those mods. He replaced
R1 3K6 -> 1K
R2 200K -> 100K
R16 100K ->  68K
C2 47nF -> 1uF NP
C4 100nF ->  33nF

Another guy wrote T.I. 4066 & 4069 chips are not working on this build.








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Bernardduur
Posts: 1482


Rogier K; Netherlands


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Re: MXR Envelope Filter subtle?
« Reply #10 on: May 19, 2006, 03:12:30 AM »

I did almost the same and now it works great!

On Tonepad a lot of builders suggest to alter the bias; DON'T DO IT! The wah gets stronger but you miss the "real" sound of the filter (and the reverse won't work). To get the filter stronger, add a 5k trimpot as R1 (dunno why this works, but it can get you real over-the-top sounds to a more subtle one)
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zeta55
Posts: 327


Krister Östman


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Re: MXR Envelope Filter subtle?
« Reply #11 on: May 19, 2006, 11:02:19 AM »

So it's working like it should now! great news, hope you enjoy it like I do mine.

/Krister
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