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MXR - Envelope Filter (1978) guts

PostPosted: 03 Jan 2008, 13:43
by modman
http://www.j-guitar.com/sp/sea/view_det ... 70697.html

Also to raise the question whether we want to consider this here or in the classic folder. Let me know your ideas...

modman

Re: MXR - Envelope Filter (1978) guts

PostPosted: 24 Apr 2008, 00:45
by super velcroboy

Re: MXR - Envelope Filter (1978) guts

PostPosted: 24 Apr 2008, 21:39
by puppiesonacid
is the dod 440 just a copy of the mxr?

Re: MXR - Envelope Filter (1978) guts

PostPosted: 24 Apr 2008, 23:04
by analogguru
The MXR used "switched capacitor" technology, while the DOD 440 was much simpler with a Dual LDR, as you can see here in the:

DOD 440 (red) schematic

analogguru

Re: MXR - Envelope Filter (1978) guts

PostPosted: 24 Apr 2008, 23:31
by puppiesonacid
cool, thanks AG.

Re: MXR - Envelope Filter (1978) guts

PostPosted: 12 Nov 2016, 01:41
by jreeves47
1978 pot codes

Re: MXR - Envelope Filter (1978) guts

PostPosted: 04 Aug 2017, 14:23
by alltrax
I built it some years ago using Tonepads pcb it's a great EF, love it

Re: MXR - Envelope Filter (1978) guts

PostPosted: 12 Aug 2017, 19:06
by rs
I saw a gutshot of Emma's Discumbobulator, (i dont remenber where) but i remember that it was pretty similar to this.
Could it be a clone wiyh some tweaks?

Re: MXR - Envelope Filter (1978) guts

PostPosted: 23 Jul 2018, 21:16
by chicago_mike
The Emma is a clone with input and output transistors. I think in mine I used 2n222 and .02 input / output caps. Biased for no gain.