MXR - Envelope Filter (1978) guts

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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modman
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Post 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...

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super velcroboy
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puppiesonacid
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Post by puppiesonacid »

is the dod 440 just a copy of the mxr?

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analogguru
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Post 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

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puppiesonacid
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Post by puppiesonacid »

cool, thanks AG.

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jreeves47
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Post by jreeves47 »

1978 pot codes
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alltrax
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Post by alltrax »

I built it some years ago using Tonepads pcb it's a great EF, love it

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rs
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Post 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?

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chicago_mike
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Post 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.
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