DOD - FX70 Stereo Flanger

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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TubeDude22
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Post by TubeDude22 »

I have a nice old DOD FX70 Stereo Flanger that uses the MN3007 and MN3101 chips. What I dig about this pedal is that with the regeneration turned all the way down, it has a sweet chorus-like tone. I want to get more of that. Are there any mods I can do to this thing to make it less like a "flanger" and more like a "chorus"?

Schematics are scarce for this but, I've attached what I could find on the web. Thanks for the input.
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FX70 stereo flangerC.jpg
FX70 stereo flanger.jpg
FX70 flanger_C.jpg
FX70 flanger_C.jpg (35.94 KiB) Viewed 1312 times
FX70 flanger.jpg
Last edited by modman on 17 Apr 2018, 14:22, edited 2 times in total.
Reason: renamed and moved thread to Modern Stompbox Dissection

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Chrisfromiowa
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Post by Chrisfromiowa »

Did you ever figure anything out with this?

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Gila_Crisis
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Post by Gila_Crisis »

looking at the schem that 500kohm pot looks like being the regeneration/feedback knob. try working on that 62k resistor. I suppose putting a higher value will limit the feedback signal and give you a more chorus sound. What you could also do/try, it's put a switch to cut that feedback loop.
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