Small Clone -> Flanger Regen/feedback control???

[beckyjc]

So ive allready done the stuff thats needed for a basic flange sound.

Used a DPDT to switch out a couple of caps so ive slowed the LFO down and shifted the predelay. Resulting in a nice sounding flange. Though its pretty subtle. So ive been looking into tapping regen points that i can control with a pot so i can get a bit of a more prominent flange.

Had a quick look around some sites and tried tapping it from junction of the 1uF cap 220k and resistor, with a pot, to the wiper of the trim pot. This makes kind of a weird cool double-ing effect on the chorus sound, But it just kills all the flanger sound and bumps up the volume. Then i tried to pin 3 of the 4588 (IC1a), with the pot turned up fully the dry signal still comes through with no flange/chorus sound

Any suggestions?

Cheers,
becky

[Thomeeque]

Any suggestions?

1st, general: if you want people to help you, make it as easy for them as possible, e.g. by linking the schemo: http://www.tonepad.com/getFileInfo.asp?id=97

2nd, if you are looking for "full range" feedback going up to self-oscillation, there's no simple way. You would need some point, where you could mix dry signal going into the BBD with wet signal from BBD output without altering amplitudes of these signals and there's no such a point in SC topology.

For a light touch of the feedback you could try this:



Where R_WET would be something like 100k max.? Note, that R_WET - R_DRY combination forms divider for both dry and wet signals going into the BBD input (Q1 is an buffer):

e.g. V_DRY = (approx.) V_A * R_WET/(R_WET + R_DRY)

and you should keep dry signal amplitude as unattached as possible (=R_WET as big as possible). Try to use 500k-1M pot and to dial something.. It's a quick "hack", if you'll find something useful this way, let us know, we should take care about some details yet (e.g. new 1uF cap polarity).

Anyway, if you want a real flanger, build a real flanger, this is not the way

Good luck, T.

[Fender3D]

You may connect the circuit output (the connection going to the switch, after the 1uF cap and the 100k to ground resistor) with a 5nF in series with 500k pot and a 22k trimmer to IC1a pin 2 ala MXR micro flanger.

@Tom, What's the difference with a "real" flanger?

[Thomeeque]

You may connect the circuit output (the connection going to the switch, after the 1uF cap and the 100k to ground resistor) with a 5nF in series with 500k pot and a 22k trimmer to IC1a pin 2 ala MXR micro flanger.

Hmmm, interesting! I would say that you should not return the dry signal back - but when it works for Micro Flanger it should be alright, cool!

Here's the micro flanger schema btw:

@Tom, What's the difference with a "real" flanger?

Well in this case (when Regen is solved actually) I'd say that he still may have problems with getting to the proper "flanger" delay time range..

T.

[Fender3D]

Well the dry signal's phase reversed in U1b, thus should be fine...
At least works for MXR.
Adjust the suggested trimmer to avoid feedback...

[Thomeeque]

Well the dry signal's phase reversed in U1b

..but reversed back in U1a

[beckyjc]

Sorry guys, totally forgot about this thread.

I know if i want a true flanger i should build one, i'm not really after a true flanger, isnt really my thing, just after ways i can make my clone do ridiculous things and learn some stuff along the way.

I've heard about connecting it to pin 2 of the ICa1, i did try that, didnt work, just horrible squeeling feedback (Really loud even with the volume set low) with no signal at all, i was working on it at 12am, so it wasnt really apprecatied .

She btw not he. :p:

I appreciate your comments and after some experimenting i worked out a way to do it myself.

Granted it doesnt sound amazing or anything and am still experimenting with pots for the best result, had to tack in a 33k resistor (rather than the trimmer, jsut worked out the point on the pot where the oscillation kicked in) to provent horrible oscillation, could probably do with a high pass filter cap too since the sweep can get reallly subby.

But i get some pretty harsh deep thick sounding flangerery-ness, veryyy far from subtle. Though only in combination with the vibrato mod.

When i get it how i want i'll post some details on my blog and a video to show you guys. Just waiting on some parts.

[beckyjc]

Andddd done finally.



Regen is up and running.

Details - http://beckyjc.wordpress.com/pedal-builds/small-clone-mods/

Vid - http://www.youtube.com/watch?v=Ez8s2-eZzv0