MXR - Envelope Filter (1978) guts

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

MXR - Envelope Filter (1978) guts

Postby modman » 03 Jan 2008, 13:43

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
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)
User avatar
modman
a d m i n
 
Posts: 4238
Joined: 19 Jun 2007, 17:57
Has thanked: 2788 times
Have thanks: 483 times


Re: MXR - Envelope Filter (1978) guts

Postby puppiesonacid » 24 Apr 2008, 21:39

is the dod 440 just a copy of the mxr?
puppiesonacid
Cap Cooler
 
Posts: 646
Joined: 02 Apr 2008, 15:41
Has thanked: 0 time
Have thanks: 5 times

Re: MXR - Envelope Filter (1978) guts

Postby analogguru » 24 Apr 2008, 23:04

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
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
analogguru
Old Solderhand
 
Posts: 3286
Joined: 26 Jun 2007, 14:58
Has thanked: 0 time
Have thanks: 112 times

Re: MXR - Envelope Filter (1978) guts

Postby puppiesonacid » 24 Apr 2008, 23:31

cool, thanks AG.
puppiesonacid
Cap Cooler
 
Posts: 646
Joined: 02 Apr 2008, 15:41
Has thanked: 0 time
Have thanks: 5 times

Re: MXR - Envelope Filter (1978) guts

Postby jreeves47 » 12 Nov 2016, 01:41

1978 pot codes
You do not have the required permissions to view the files attached to this post.
jreeves47
Breadboard Brother
 
Posts: 95
Joined: 16 Sep 2010, 23:59
Has thanked: 33 times
Have thanks: 18 times

Re: MXR - Envelope Filter (1978) guts

Postby alltrax » 04 Aug 2017, 14:23

I built it some years ago using Tonepads pcb it's a great EF, love it
alltrax
Breadboard Brother
 
Posts: 54
Joined: 28 Mar 2013, 09:29
Location: Bordeaux, France
Has thanked: 11 times
Have thanks: 17 times

Re: MXR - Envelope Filter (1978) guts

Postby rs » 12 Aug 2017, 19:06

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?
rs
Breadboard Brother
 
Posts: 64
Joined: 01 Dec 2007, 15:40
Has thanked: 80 times
Have thanks: 5 times


Return to Vintage Stompbox Corner ( ... - 1975)

Who is online

Users browsing this forum: No registered users and 3 guests