gritty effect

[octafish]

Re: Power supply with a 9V batt.

Just substitute a voltage divider from any 9v opamp based circuit so that you have similar reference points ie: 9V 4.5V and 0V.

[SeanCostello]

Bat Macumba!   

I'll let the others fill you in.

OK, here goes:

bat macumba ê ê, bat macumba oba
bat macumba ê ê, bat macumba oba
bat macumba ê ê, bat macumba oba
bat macumba ê ê, bat macumba o
bat macumba ê ê, bat macumba
bat macumba ê ê, bat macum
bat macumba ê ê, bat ma
bat macumba ê ê, bat
bat macumba ê ê, ba
bat macumba ê ê
bat macumba ê
bat macumba
bat macum
bat ma
bat
ba
bat
bat ma
bat macum
bat macumba
bat macumba ê
bat macumba ê ê
bat macumba ê ê, ba
bat macumba ê ê, bat
bat macumba ê ê, bat ma
bat macumba ê ê, bat macum
bat macumba ê ê, bat macumba
bat macumba ê ê, bat macumba o
bat macumba ê ê, bat macumba oba
bat macumba ê ê, bat macumba oba
bat macumba ê ê, bat macumba oba

Hope that helps.

Sean Costello

[birt]

O.K. I noticed a mistake I made (in red), Also added the other channel idea.

I really got get this wired together.

that's the same as my idea except for the second output. cool
we did lose the blinking indicator with this mod.

let's think what else we can do with it

[Harry]

I wanted to add an assymetry control, to control the length of the pauses. For example:
Normal:
___***___***___*** <--- even length of on vs off
I'd like to make it go:
__*****__*****__
and also:
_____**_____**
Sort of offset the on and offs.
I have no idea how to do this though.

I also set it up so instead of opening and closing the guitar's signal, it would switch between open guitar signal and open guitar signal with tone filter. Maybe if you had it switch between a high-pass and a low-pass it could be some sorta strange choppy vibrato.

You could also use it to turn any other effects on and off. Maybe a fuzz, will give you some grit. The led/ldr combo used in this way is basically an spst switch.

let's think what else we can do with it

Alright your turn!!!

[GFR]

Bat Macumba!   

I'll let the others fill you in.

The effect in this song was made with a pot (broken so that it can rotate 360 degrees) attached to a sewing machine motor. The sewing machine pedal used to change the rotating speed. As it rotates the signal is modulated. There's part of the rotation where the signal is cut off.

Another creation of Claudio Cesar Dias Baptista (CCDB). 

[MartyMart]

Harry ,  erm ....... still can't see you're circuit picture  :-(
Site is always "down" !

MM.

[Harry]

I spy with my third eye...

Made for the visually impaired.
Bat Macumba, o.k. now understand, thought you guys were spreading voodoo curses. That's a great idea now i've gotta break apart a pot and attach a motor to it! If you went fast enough it would be sawtoothy. Maybe use a dual-gang???

[Dave_B]

I wanted to add an assymetry control, to control the length of the pauses.

Did you look at R.G.'s Stutter pedal? 

[Harry]

Does the stutter do this? I took a look at the schematic, but didn't understand it (as usual). This is a completely different approach to the circuit and couldn't be easily implemented into mine, right?

Another creation of Claudio Cesar Dias Baptista (CCDB). 

Did he have others?

[Dave_B]

Does the stutter do this?

The stutter shuts the guitar signal off and on.  It also allows you to control the "width" of the on/off period.  That sounds exactly like what we're talking about. 

Dave

[GFR]

Another creation of Claudio Cesar Dias Baptista (CCDB). 

Did he have others?

Do a search on the forum for "Mutantes". If you can, hear some "Os Mutantes" and "Sergio Dias" stuff.

[birt]

if you bypass the ldr with a pot so you have a depth control

[puretube]

You`re all aware of the fact,
that the "depth" (max. attenuation)
heavily depends on the input impedance
of the following device,
and the type of LDR?

(same goals for an "on"-volume-drop...)

[birt]

You`re all aware of the fact,
that the "depth" (max. attenuation)
heavily depends on the input impedance
of the following device,
and the type of LDR?

(same goals for an "on"-volume-drop...)

thats why we're experimenting (especially me because i don't know enough about electyronics to actually understand what you are saying

[Harry]

if you bypass the ldr with a pot so you have a depth control

Depth but it would just instead of cutting all the volume it'd only cut some volume. It was doing this to me automatically before i had shielded it.

[birt]

i'm not sure about the opamp. I know it has the same pinout as 4558 or tl072 but does this circuit only use one half of the opamp? what pins should i use?

[nelson]

i'm not sure about the opamp. I know it has the same pinout as 4558 or tl072 but does this circuit only use one half of the opamp? what pins should i use?

Use any single opamp, or even half of a dual, use the other half to buffer the input

Check datasheet for corresponding pins.

[robbiemcm]

Thankyou so much for that idea Harry.. you just triggered something in my mind which could solve all my problems, it would be pretty much based around what you've got now. However I must ask for some help in terms of getting an LDR to effectively act as a volume pot. Could I be right in thinking what do you think about putting the LDR from ground to the middle wiper of a pot used to effectively 'tune in' the LDR to the right spot? Either way, I'm so giving this beaty a go. Although the only problem I can see with this is.. how fast do LDRs react? If it's not a fraction of a second I suppose my design won't work (and I'm talking full resistance to none).

[Harry]

Sorry for the long response time robbie, my internet has not been working.
It seems to me that they respond very fast, like I could no longer notice that led was blinking (fast) but I could hear the difference in the sound of the guitar. I honestly can't remember if I added resistance to the ldr, but I think that I hadn't, that went from full volume to none, at least close enough I thought. About using ldr/led's as a vol pot I've heard of people doing that in order to prevent scratchieness of pots, obviously the downfall would be the use of a battery. I've always heard it being used in wah pedals.

[jmusser]

I believe the "728" designation is NTE for a 5532 chip if I remember right.