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DOD FX70 stereo flanger schematic?

Started by jdub, March 21, 2012, 09:29:05 AM

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jdub

March 21, 2012, 09:29:05 AM
Anyone know where to find one?  Google and forum searches turned up nada.  This is the older one, not sure how similar to the later FX75, 75B, etc.- MN3007 with 3101 driver. Thanks!
A boy has never wept nor dashed a thousand kim

Mark Hammer

#1
March 21, 2012, 10:00:33 AM
Google image searches are often successful.  A quick search brought me this info: http://www.americaspedal.net/fx70/

Fender3D

#2
March 21, 2012, 10:16:48 AM
lol
it's hard to believe a 3007+3101 @ 0.5ms
"NOT FLAMMABLE" is not a challenge

jdub

#3
March 21, 2012, 10:17:27 AM
Thanks, Mark- I did an image search (usually how I search for schems) and found that page, but there is no schem there for the FX70, just a component-side gutshot.  That same site does have a schematic for the FX75, but I'm not sure how similar the two circuits are (an obvious difference being the width control on the FX75).  Appreciate the reply all the same, though.  :)
A boy has never wept nor dashed a thousand kim

jdub

#4
March 21, 2012, 10:20:28 AM
Quotelol
it's hard to believe a 3007+3101 @ 0.5ms

You ain't kiddin'... :D

A boy has never wept nor dashed a thousand kim

Govmnt_Lacky

#5
March 21, 2012, 10:41:56 AM
If I were to be a bettin' man.....

FX75 = FX70 with "dropped in" WIDTH control + splitting of the original stereo output jack into (2) mono jacks.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

jdub

#6
March 21, 2012, 10:55:15 AM
Could be, could be... I 'spose I could just trace & compare with the FX75 schem...but finding time to do it is tough these days
A boy has never wept nor dashed a thousand kim

Govmnt_Lacky

#7
March 21, 2012, 10:57:48 AM Last Edit: March 21, 2012, 11:01:33 AM by Govmnt_Lacky
Quote from: jdub on March 21, 2012, 10:55:15 AM
Could be, could be... I 'spose I could just trace & compare with the FX75 schem...but finding time to do it is tough these days

John,

I HIGHLY doubt that DOD re-invented the wheel.

I would focus on the width portion of the schematic and see how they "added" it into the original FX70 circuit.

As for the outputs. Dollars-to-donuts that they just seperated the stereo jack into dual mono jacks  ;)

By the way.... Is there a problem with the pedal? Why the interest?
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

jdub

#8
March 21, 2012, 11:38:50 AM
Nothing major- a buddy just gave me one the other day and I wanted analyze the circuit, and having the schem just makes it quicker.  It's missing the switching footplate, but I have an old DOD carcass that I can get that from, no biggie.  Needs a cleaning, too- looks to be from around '83, with all the accumulated gig-crud one would expect from a pedal of that age.  But really, I'm just curious.  If I can't find a schem, I can always trace & post for the interest of other flange-heads when I get a little time.  Apparently it's not a very in-demand or highly-rated unit, but what the heck... ;D
A boy has never wept nor dashed a thousand kim

Mark Hammer

#9
March 21, 2012, 02:58:38 PM
Quote from: Fender3D on March 21, 2012, 10:16:48 AM
lol
it's hard to believe a 3007+3101 @ 0.5ms
You CAN get 500usec from a 3007 +3101, but it won't necessarily be a pretty 500usec.  Happily, the remainder of the sweep will be well within the range where the chipset will produce pleasing delay with minimal artifact.
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