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Shameless plug.  I offer this:
http://pcb.delyk.com/utility-boards/55-jfet-smd-to-thd.html#/5-jfet_options-mmbf5457

At this point, I'd get an SMD to THD converter.  The PCBs can be had on eBay for nothing, and the JFETs themselves (MMBF2457) aren't awful.

I'm in the USA, but I offer this:  http://pcb.delyk.com/utility-boards/55-jfet-smd-to-thd.html#/5-jfet_options-mmbf5457

I think someone in another forum had the same problem in Australia and found someone local who had something similar.

I would say I was probably wrong about the ET not benefiting from a blend circuit, but I also don't particularly care for blended compression at the front end of a guitar anyway. (Recording is a different matter. I'm all about blended compression in post.)

All of your info makes sense.  Thank you!

The only thing I want to confirm, just for my sanity: the ET, like the DynaComp will invert the phase; correct?  Therefore, I'd need a summing opamp and an inverting opamp?

Don't just jam whatever compressor you like into a blend circuit. You need to make sure that the signals will be in phase at the output. (So you can't just put the Bearhug in the JMK Panner for instance without extra work, not that I think that the Bearhug benefits from a blend circuit given the short decay.) The 4:1 was set up to do the blend right. The fractional extra speed you get with an OTA compressor like what's in the the Wampler over a fast vactrol like the VTL5C1 is not really that meaningful when you're using the clean blend to retain the attack of the note.

If you want to be able to add any compressor (or other pedal) to a blend circuit so you can experiment, read this: http://www.geofex.com/Article_Folders/panner.pdf

Jon, did I read an old post of yours correctly in that the Engineer's Thumb doesn't need an added blend?  It already has it using the RATIO pot?

That's beautiful! Really cool of drolo to allow his design to be used by delyk also.

Agreed.  I was surprised he allowed it.

Dude, that looks spectacular.  Nicely done!

We need more than just text.  Show us pics and give us IC readings.  I think there may be a beginner's guide somewhere here; try to find and read it.

Side note, I'm in Anna, TX... I guess I could try to help if you brought it to me.

OK, what about the buffer circuitry? I guess that is sharing the normal GND? can you bypass that to rule it out?

I popped out the opamp and set the switch to bypass.  No change. 

At this point, I'm going to redesign a few things to get rid of the OLED. A friend of a friend said that OLEDs are "just noisy."

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The noise is when any pixel is lit.  Just a static text, you get noise.  I don't think it's the I2C lines.

Just had a closer look, you've got the AGND & GND connected in the pic, does it still have noise with them disconnected?

Yup.

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Building a looper was one of my 2 pedal resolutions for 2017 .

Good!  Hold tight and I'll hopefully get this remedied ASAP.

I looked at either the 16x2 or 20x2 but gave up trying to find a neat mounting solution.

I'm having to figure that out as we speak.  I have an idea, but don't want to share yet. 

With the Opto mute are you driving it straight from the IC or through a 1k resistor still, also are you muting with a delay before & after the relay switches?

I also have a 100k resistor in series with the audio straight off the input jack tip.

When I get the soft muting to work, I'll do it before/after the relay switch.  Right now, if I just use a button to toggle it (testing), I get the pop.

Looks good, very similar to something I'm finalizing however I'm using a LED alphanumeric display.

I guess this is what was being discussed here?: http://www.madbeanpedals.com/forum/index.php?topic=24225

Whats this issue with noise from the OLED? separate GND plane for AGND & DGND? is there only noise when data is being written to the display or is it constant? I'm guessing with the display removed its noise free so it isn't the I2C bus in general

All of that is 100% accurate.

I will probably have to switch to LCD.  That's fine with me, but I don't know which to use.  It will take longer, since I'll have to redesign the enclosure and PCBs.

The noise is when any pixel is lit.  Just a static text, you get noise.  I don't think it's the I2C lines.


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Congrats on both!  Beautiful baby and guitar.

I would recommend carrying the baby in a more padded case, though.  I don't think that one's going to protect him well enough.

I've been eyeing the MONO Acoustic + Electric + Baby case. A bit out of my price range.

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That SO looks like something I could have used, before my Axe. I still might be interested. Could you daisy chain two of them together? For even more loops?

I have thought about this and theoretically, yes.  I'm 99% sure we can with MIDI.  I designed it so we could, at least.

In your mind, set one as the master controller, then the other as the slave.

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Well, it's probably about time to let the cat out of the bag.  (This is what I had hoped to enter into the contest.  Silly newborn... and Mammoth was a week late.)

I've been working with numerous folks since September to try and design a looper that could at least semi-rival some of the commercial products.  I had a few goals in mind:
* Beat the price of the BYOC Super 8
* 8 loops
* Allow for more banks (99 banks, 4 patches each. 396 presets)
* MIDI In and Out
* Reduce off board wiring
* Offer more features
* Much better display than a simple RGB LED
* Eventual open source!

Other features:
* Buffered or bypass input
* Buffered tuner out
* Hard mute, available with external footswitch
* Soft mute occurs before patch changes to reduce click/pop
* Bank up / Bank down available with external footswitch
* Tap tempo to send to MIDI devices (hopefully in a future software update)
* External Aux footswitch. Not sure of purpose yet, but probably allows immediate manual control of loops
* ENIG PCB

What you see here is a prototype.  It is awfully close to what the final will be.  I had to learn a metric schlock ton of stuff to get to this point.

I have two issues that I'm still working out.
* If anyone knows how to get rid of noise from the OLED, please oh please help.
* I get some click/pop noises from the optofet. Probably need to tweak cap values.

I will be offering this as a kit.
* Aiming for $175ish + S&H
* Includes everything but wire
* INCLUDES ENCLOSURE!!!!
* International shipping will _probably_ be cost prohibitive.

There will be a patch editor available, eventually, for use in Windows, OS X, and Linux (I hope?) to assist in managing patches and MIDI commands.

Who's in?  Here's the pre-order form: https://goo.gl/forms/mfqwBJfCbjLxwiLA2