MOOG Moogerfooger MF-103 12-Stage Phaser  [schematic]

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

Any reason why this wouldn't work...? (corrected)
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MF phaser.pdf
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Last edited by djathey on 24 Nov 2020, 02:25, edited 6 times in total.

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Lithium_Grim
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Post by Lithium_Grim »

It will work, but the question is if it will sound nice. The layout will be huge with 6 LM13700 and parts....
Where is the LFO?
I only give negativ feedback and y'all love it!
PCB shop

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Xaser
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Post by Xaser »

Hi Guys,

funny that this thread just got revived. I've been working with raindog's schematic together with the "official" one posted here recently, to create a schematic for a new pcb layout (hopefully fitting in a BB case). I was just wondering, if anyone here can think of a reason why one would NOT be able to just switch the CB4053N for a mechanical (foot)switch?. I'd probably also consider adding an option for "true bypass" to the board, as I usually have a buffer in my tuner pedal before it. Also, would there be a significant benefit of increasing the 6/12 stage switch to 2/4/6/8/10/12 switch? would it make a significant difference?

@djathey, I'd love to help, but that's waaaay to little information. Where's the rest of your schematic, what does your layout look like? All we can do with the info provided is compare your schematic to raindog's one and I'm sure you are more than capable of doing that yourself :)

Thanks,
Max

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djathey
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Post by djathey »

I am using this as a way to simultaneously learn eagle, while attempting to layout a multboard eurorack mf103: one board for controls/mixing et al., and one board for phase.

It's still a work in progress.

However, noticed the following: while r100 appears in 'official' schematic, I could not find an 'r100' on the actual board, so this may be extraneous.

To help me identify things, I took a gutshot photo, and added some labels for CN1, see attached.
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MF103 CN1 labels.PNG

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Xaser
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Post by Xaser »

I can see R100 on your image. It's above the resistor that is left of the red connect with the wires.

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djathey
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Post by djathey »

I think I've bit off more than I can chew...
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MF phaser rat nest.pdf
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Last edited by djathey on 24 Nov 2020, 02:26, edited 1 time in total.

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The G
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Post by The G »

djathey wrote: 23 Nov 2020, 06:24 I think I've bit off more than I can chew...
:lol:

If I'd be in your place, I'd try to modularize the circuit since it has so many repeated parts. Maybe even on separate pluggable PCBs with input, output and power supply pins on the connectors.

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djathey
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Post by djathey »

2 stacked boards now: audio and phasers, for use with 20HP eurorack (80x100mm board sizes)
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MF phaser phasers.pdf
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MF phaser audio.pdf
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Last edited by djathey on 07 Dec 2020, 06:51, edited 2 times in total.

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Post by djathey »

Attempting to make this usable for both eurorack and stompbox, using a separate 'jacks' board: one for 3.5mm and a different one for 6.35mm (1/4"). Trying to keep all boards now within 80x100mm limits of free version of eagle, for now...
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MF phaser thonkiconn jacks.pdf
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djathey
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Post by djathey »

The 6.35mm (1/4") jack version.

Hope this ultimately does work...
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MF phaser 6_35mm jacks.pdf
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Last edited by djathey on 05 Dec 2020, 07:35, edited 1 time in total.

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uncleboko
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Post by uncleboko »

Surely cramming all this into a tiny case is asking for trouble, safer to use a rack case and give yourself more space.

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djathey
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Post by djathey »

Yes, working with 0-100mv ac signals is going to be a challenge: grounding/shielding will be interesting-we'll see how it goes.

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Post by djathey »

First draft - hope these don't wind up just being fancy trivets...
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MF phaser-phasers draft.pdf
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MF phaser - 6_35mm jacks draft.pdf
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Xaser
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Post by Xaser »

I feel you :D
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Clipboard01.jpg

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djathey
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Post by djathey »

Alpha/untested version of all boards: need to rely less on autorouter.

• Utilized a 'sandwich' of 3 boards: Control, Phasers and Audio, with headers to form a kind of 'bus', to send signals between boards.
Trying to keep overall form factor small, especially for eurorack use.
• 2 interchangeable 'jacks' boards: one for eurorack (3.5mm) and one for stompbox (6.35mm; 1/4")
• Powered from either 2.1mm dc power (12vdc) or eurorack 10pin power connector (+/-12vdc).
• The voltage regulators are overkill, but I'm more or less familiar with them, so I went with what I knew.

Still need to noodle out a front panel layout...
Attachments
MF phaser RS jacks.pdf
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MF phaser audio no jacks.pdf
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MF phaser phasers.pdf
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MF phaser controls.pdf
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MF phaser 6_35mm jacks.pdf
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Last edited by djathey on 12 Jan 2021, 04:53, edited 3 times in total.

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Post by djathey »

First pass for a eurorack mf103 front panel.
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MF103 FPD.pdf
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Last edited by djathey on 05 Jan 2021, 04:30, edited 1 time in total.

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Post by djathey »

Draft of pcb's: there's no turning back now...
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MF phaser pcbs.pdf
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Post by djathey »

Time to give this project some 'wiiings': have sent boards out to be made.
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MF phaser ALL.pdf
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Post by djathey »

Who needs a protoboard, when you have a ... pc board (well, 4 boards).
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Ihno
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Post by Ihno »

Does it work? Im really interestetd in this one.

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