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Author Topic: DOD FX70 stereo flanger schematic?  (Read 1209 times)
jdub
Posts: 361


John W.


DOD FX70 stereo flanger schematic?
« on: March 21, 2012, 07:29:05 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!
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Mark Hammer
Posts: 21865


WWW
Re: DOD FX70 stereo flanger schematic?
« Reply #1 on: March 21, 2012, 08:00:33 AM »

Google image searches are often successful.  A quick search brought me this info: http://www.americaspedal.net/fx70/
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Fender3D
Posts: 716


Federico S.


Re: DOD FX70 stereo flanger schematic?
« Reply #2 on: March 21, 2012, 08:16:48 AM »

lol
it's hard to believe a 3007+3101 @ 0.5ms
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jdub
Posts: 361


John W.


Re: DOD FX70 stereo flanger schematic?
« Reply #3 on: March 21, 2012, 08:17:27 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.  Smiley
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It is my firm belief that it is a mistake to hold firm beliefs
jdub
Posts: 361


John W.


Re: DOD FX70 stereo flanger schematic?
« Reply #4 on: March 21, 2012, 08:20:28 AM »

Quote
lol
it's hard to believe a 3007+3101 @ 0.5ms

You ain't kiddin'... Cheesy

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Govmnt_Lacky
Posts: 4335


I'M ONLY GETTING CLEAN OUTPUT!!!!


Re: DOD FX70 stereo flanger schematic?
« Reply #5 on: March 21, 2012, 08:41:56 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.
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jdub
Posts: 361


John W.


Re: DOD FX70 stereo flanger schematic?
« Reply #6 on: March 21, 2012, 08:55:15 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
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It is my firm belief that it is a mistake to hold firm beliefs
Govmnt_Lacky
Posts: 4335


I'M ONLY GETTING CLEAN OUTPUT!!!!


Re: DOD FX70 stereo flanger schematic?
« Reply #7 on: March 21, 2012, 08:57:48 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  Wink

By the way.... Is there a problem with the pedal? Why the interest?
« Last Edit: March 21, 2012, 09:01:33 AM by Govmnt_Lacky » Logged

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jdub
Posts: 361


John W.


Re: DOD FX70 stereo flanger schematic?
« Reply #8 on: March 21, 2012, 09:38:50 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... Grin
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It is my firm belief that it is a mistake to hold firm beliefs
Mark Hammer
Posts: 21865


WWW
Re: DOD FX70 stereo flanger schematic?
« Reply #9 on: March 21, 2012, 12:58:38 PM »

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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