blend pedal w/ feedback loop

[britt-stinker]

Hey everybody!!

I need a little help with building a Blender(http://www.geocities.com/jrtookmyfalseteeth/buffblnd.gif).
The thing is that I would like it to function as a feedback loop also(possible with a photosensitive eye/LDR or what its called). But I'm unsure wheter this would work.

I'm thinking that the feedback path should go from effect output to a DPDT toggle switch to switch either the LDR's or the pot in and then to the input. Is this a stupid plan?

I have these photo sells lying around are they okay?:
Photo cells 3k-12kOhm
Light resistance: 3k-12k
Dark resistance: min. 600k.

I want to have a 2 colored led to show feedback loop/ or normal "on". The first leg should be connected to 9 volt. the second to ground but whatabout the third to show feedback loop on?

And something totally different. I know its a long description:
I just thought about something ells. I have a Moog Ring mod, but I've been thinking about selling it because I don't really use it to it's full potential. So I was thinking about if the freq knob on the frobnicator works the same way like the one on the moog(I know they both control freq. But does it make some of the same sounds, if I turn down the amount of lfo added on the moog. Can it make any of the same kind of bell klangs like the moog can.)

Thanks

[MartyB]

Feedback loop as in the "Total Sonic Annhilation" effect/variants?  Do you want just 'to' and 'from' jacks to do both blend or feed back, by toggling, without changing patch cables ?  The Splitter-Blender could probably do both.  I'm trying to see your idea about using LDRs.  LED/LDR combinations help isolate one circuit from another, or were you just thinking of using the LDR exposed to the outside that you would control by covering it with your foot etc?

[moosapotamus]

I'm thinking that the feedback path should go from effect output to a DPDT toggle switch to switch either the LDR's or the pot in and then to the input. Is this a stupid plan?

... Using just one side of the DPDT to switch between the pot and the LDR, and the other side of the DPDT to switch your bi-colored LED, yes? I think that would do it. The bi-colored LED would change color to indicate that either the pot or the LED is active in the feedback loop. But, the feedback loop will always be on, through either the pot or the LDR. Is that what you want?

With a big enough value pot, you might be able to dial the feedback out when you flip the switch to the pot. Or, you could use a center-off toggle switch. In the center position no contact is made to either the LDR or the pot... no feedback and the LED is not lit.

I want to have a 2 colored led to show feedback loop/ or normal "on". The first leg should be connected to 9 volt. the second to ground but whatabout the third to show feedback loop on?

The third is also connected to ground. You could do the wiring connections a few different ways, but here's one... Connect the center pole of the toggle to ground. Connect the two ground legs of the bi-color LED to the outside throws of the toggle. When you flip the toggle, only one leg will make the connection to ground at a time.

~ Charlie

[britt-stinker]

Feedback loop as in the "Total Sonic Annhilation" effect/variants?  Do you want just 'to' and 'from' jacks to do both blend or feed back, by toggling, without changing patch cables ?  The Splitter-Blender could probably do both.  I'm trying to see your idea about using LDRs.  LED/LDR combinations help isolate one circuit from another, or were you just thinking of using the LDR exposed to the outside that you would control by covering it with your foot etc?

Yes, a feedback loop like in the "Total Sonic Annhilation". I'm gonna use the box as a true bypass box, but with a blend control and a feedback loop.
The point was that if it could work I would like one toggle to switch between TB box/Feedback loop, and a toggle to switch the LDR on/off. Like on the True Beautyfull Disaster. That shouldn't be to hard But will it work, whit the blend pot also being there?

[britt-stinker]

... Using just one side of the DPDT to switch between the pot and the LDR, and the other side of the DPDT to switch your bi-colored LED, yes? I think that would do it. The bi-colored LED would change color to indicate that either the pot or the LED is active in the feedback loop. But, the feedback loop will always be on, through either the pot or the LDR. Is that what you want?

I'm gonna use a center off toggle for feedback/normal switch.
And do what you said about the DPDT

[britt-stinker]

Hi.
Can someone confirm if this will work?


It is supposed to toggle between blend loop and feedback loop(controled by ldr or pot) it is an on-off-on toggle switch.

Thanks

[britt-stinker]

Anyone?
Im unsure the toggle switch connects right to the output.