What's on the workbench?

LukeFRC said:
fair few transistors and diodes in that!
Click to expand...

Looks like some sort of discrete flip-flop / FET switching.

I just realized that:

1) I didn't even bother to plug this pedal in to see if it works before gutting it
2) I have nothing to test this pedal with

Now I'm going to have to buy an acoustic, and some sort of XLR equipped device to plug it into....
 
@Robert-

A) I assume you just reach into an Event Horizon portal to grab whatever instrument you happen to need at the moment. Does it have a passive pickup in it?

B) thank you for the new profile pic. I call him Lego Pharoah.

C) you'll be happy to know that many of my mandolin parts barely present as such - here's a spot I did on a Dream Pop album, for instance. Not sure anyone would guess there's electric mandolin on it. https://clocktowermusic.bandcamp.com/track/it-happens
 
Robert said:
I just found it in the closet, I have no idea. Since that's what I need, I'm going to say probably not.

I'm just joking around about the mandolin thing, I can't even place hearing one aside from Losing My Religion....
Click to expand...
I'm pretty ambivalent about REM generally, but I've heard that song enough for a lifetime.

If the Ovation has a battery-powered preamp it probably won't tell ya a whole lot about the Red-Eye... still, it's somethin!
 
Some mandolin tracks…

  • Ween- Ocean Man
  • Led Zeppelin- Battle of Evermore
  • The Band- Rocking Chair
  • The Beach Boys- Disney Girls
  • R.E.M.- Man on the Moon
  • Elton John- Mona Lisas and Mad Hatters
  • The Kinks- Supersonic Rocket Ship
  • Paul McCartney- Dance Tonight
  • The Band- Rag Mama Rag
  • Grateful Dead- Friend of the Devil
 
About 75% of this circuit is MOSFET switching for the Boost and battery check circuit.

How important is battery operation?

Would there be any point in an FX Loop bypass footswitch?
 
Last edited:
Bricksnbeatles said:
Some mandolin tracks…

  • Ween- Ocean Man
  • Led Zeppelin- Battle of Evermore
  • The Band- Rocking Chair
  • The Beach Boys- Disney Girls
  • R.E.M.- Man on the Moon
  • Elton John- Mona Lisas and Mad Hatters
  • The Kinks- Supersonic Rocket Ship
  • Paul McCartney- Dance Tonight
  • The Band- Rag Mama Rag
  • Grateful Dead- Friend of the Devil
Click to expand...
And everything by the String Cheese Incident
 
Bricksnbeatles said:
Some mandolin tracks…

  • Ween- Ocean Man
  • Led Zeppelin- Battle of Evermore
  • The Band- Rocking Chair
  • The Beach Boys- Disney Girls
  • R.E.M.- Man on the Moon
  • Elton John- Mona Lisas and Mad Hatters
  • The Kinks- Supersonic Rocket Ship
  • Paul McCartney- Dance Tonight
  • The Band- Rag Mama Rag
  • Grateful Dead- Friend of the Devil
Click to expand...
I'm not much of a dead head but I've always liked playing Friend of the Devil. It's a good one.
 
Robert said:
About 75% of this circuit is MOSFET switching for the Boost and battery check circuit.

How important is battery operation?

Would there be any point in an FX Loop bypass footswitch?
Click to expand...
Battery operation is probably good to have for people using it on a belt pack sort of thing. While a battery check feature sounds nice, I don’t think it’s essential.

A standard 1/4” unbalanced output would be nice to have in addition to the balanced XLR out.

FX loop bypass could definitely be really beneficial.
 
Bricksnbeatles said:
A standard 1/4” unbalanced output would be nice to have in addition to the balanced XLR out.
Click to expand...

Although I suppose there might be a situation where you want both, the Loop Send is an unbalanced output.

The Loop Receive jack is basically just the input to the passive DI, there's no other reason to feed the loop back into the pedal if you aren't using the XLR out.


1734906476578.png
1734906584853.png
 
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Robert said:
Although I suppose there might be a situation where you want both, the Loop Send is an unbalanced output.

The Loop Receive jack is basically just the input to the passive DI, there's no other reason to feed the loop back into the pedal if you aren't using the XLR out.
Click to expand...
Yeah, I guess on second thought it is probably a specialized enough use case where it would be easy enough to just put a buffered split off the loop receive to add a 1/4” out in parallel with the DI out.

I see an effects bypass being useful for people who are running a combination of pedals for one instrument, like an EQ and comp for mandolin, that would otherwise be bypassed simultaneously their main acoustic. Of course, might be better off not trying to make a Swiss-army box with potential features that probably will go unneeded by most folks.

Even personally, I’d probably build one version that’s pretty much just stock as a grab-and-go preamp/DI, and then for what I’d actually put on my acoustic board, a stripped back version where I’d omit the DI and loop features entirely and have it as just a piezo preamp and boost.
 
This one isn't a belt clip, I think that's the K&K isn't it?

The signal path itself is really simple, just a single opamp gain stage. I actually like what it does to my clean electric tone, I haven't tried an acoustic yet.

I don't quite understand all of the "impedance matching input" marketing, it's literally a simple single opamp gain stage... There are six MOSFETs in there but not a single one of them in the tone path. (Okay, technically two are in the signal path since they switch the Boost pot, but they do not contribute to the tone of the circuit)

I don't have the pedal in front of me but I want to say the opamp is a TLC2262, so I believe that has MOSFET input stages, does that count?

Or maybe that's the new version? ... Hmmmmmm. :unsure:


Just a straight 1/4" in / out version would be dead simple, but I'm guessing a lot of the desire for this comes from the balanced / isolated output.
It's just a matter of getting all the hardware to fit in a "presentable" way really... More than half of the components could be eliminated by using a 3PDT footswitch.
 
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Robert said:
This one isn't a belt clip, I think that's the K&K isn't it?
Click to expand...
K&K is I think inherently a belt clip design, but if you look around on the acoustic guitar forums, a decent number of guys use the Red Eye wire tied to their guitar strap or with a belt clip screwed against the lid to make it a belt-mounted pack.
 
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