TB loop/Feedback loop

[BoatRich]

Something like the Fairfield Operator!? with a switchable feedback loop on a normal TB pedal seems like it could be really easy to build. Am I correct in thinking this? I've meaning to start building and I want to start with this and a Super Duper 2n1/some other SHO circuit. I've read all of the Beavis Audio stuff but is there anywhere else besides here and FSB I should be looking for this info?

[tabbycat]

Something like the Fairfield Operator!? with a switchable feedback loop on a normal TB pedal seems like it could be really easy to build. Am I correct in thinking this? I've meaning to start building and I want to start with this and a Super Duper 2n1/some other SHO circuit. I've read all of the Beavis Audio stuff but is there anywhere else besides here and FSB I should be looking for this info?

hey boatrich, here are some starting points.

feedback looper help @ ilf
viewtopic.php?f=151&t=3003


http://www.harmonycentral.com/forum/for ... 9/1874884-


http://experimentalistsanonymous.com/bo ... ?topic=134

like you, i'm trying to think of something to add to it to make a basic fb looper that bit more interesting.

have heard an lpb or a basic buffer in the mix can make things worse rather than better, i.e. you just end up with squeal every time you hit it as it gets from no feedback to max too quickly.
am looking at putting a tremolo or stutter across the output but haven't really sat down and thought it through deeply yet. just playing.
but these would be my starting points. they work, so use one of them as your foundation and if you try something and it doesn't work, undo it and you're back to a working base again.

good luck.

ps. how are you doing with rfurtkamps 'test pattern from hell'? http://media.furtkamp.com/gbtestpattern ... itches.jpg
i remember you saying you were planning to try it. have got as far as finding reliable vero layouts and schematics for the soda meiser and the 33 silver crank, and the test pattern offboard layout is here download/file.php?id=20972 so when i have caught up with my other building i will try to 'inflict' the rfurtkamp variations on that standard layout and post a final vero layout here. but may be a month or so, as am way behind with other things.

[tabbycat]

re test pattern from hell viewtopic.php?f=151&p=935608#p935608

[BoatRich]

I'm thinking the TP from Hell is out of my scope currently, so i'm planning to work up to it or have MSLP build it hopefully. (It'd be way prettier looking then) Thanks a ton for the schem for the FB loop/TB loop though! Once my new soldering iron gets in I think I'm going to start on that.

[zoooombiex]

I'm just getting into the feedback looper issue, and I was interesting in building something even simpler. Is this possible:

-I don't need a true bypass loop, so I don't need a switch to turn the loop on and off.
-Unless it's absolutely necessary for the design to function, I don't need a switch to turn the feedback on and off. I'd really just like one knob that controls the amount of feedback, from 0 to full.

My thought was that I could just route the signal from the input > send > (external effect) > return > then have the signal from the return go two places: (1) directly to the main output, and (2) to a volume pot and then on to the send jack. So if the volume pot is at zero, there is no feedback, and as you turn it up the amount of signal fed back to the send jack increases. And the output from the return is always being fed 100% into the main output of the pedal.

Is there a reason this won't work? If it would, I think I could build that. Or if someone already makes one I'd be interested in that.

As an expansion of this, and along the lines someone suggested above, I was thinking I could add another send & return that comes right after the feedback volume pot. That would allow me to insert devices into the feedback portion of the circuit only.

Thanks for your help!