Very short delay circuit (from 0 up to 50 ms)

[PRR]

1mS is one foot of air. Move one mike one foot. Or less, for sub-mS adjustment.

There is a commercial box for re-phasing microphones. Not cheap, but no DIY alternative is attractive.

For low-fi: put signal to a small speaker, through a hose, to a mike. Adjust hose length. Speaker, mike, and hose resonances and flaws make this pretty nasty, but Cooper(?) TimeCube was offered commercially.

[toneman]

I think there was an old old Audio Amateur Magazine article about making a "delay" out of 1/4in plastic tubing 

I remember I had a photocopy of it long ago.   

But, I doubt I could find it now.... 

[mistahead]

I just want someone to post a basic "capacitor bucket" type cicuit to do basically this.

I'm not good enough to (re)design anything like it but wan't to see how hard I can push a design like that (sideways).

[StephenGiles]

"I'm looking for a simple circuit that provides a very short delay to a line signal"

Do you mean "line" level, which is considerably higher than instrument level?

What do you need this short delayed signal for?

[Fender3D]

@Mark
when raising clock signal level attenuation is worse than clock current issue...
ie. MN3007 @1.6MHz is 10-12 dB less than @100KHz with or without clock buffers...

hmmm maybe I exaggerated a little... 

That's an interesting piece of info.  I never knew that.  Do you have any sense of what the critical point is with respect to where such attenuation becomes more apparent?  For example, would a clock rate of 300khz only lose you 1.3db, or whatever?

(click pic for hires)

I knew Tomas did a good job...  

Btw

just breadboarded an MN3007 with ADA flanger's VCO.
I had more or less the same results as Tomas

Basically:

-1dB from 30KHz to 350KHz
-2dB @ 460KHz
-3dB @ 600KHz
-4dB @ 760KHz
-5dB @ 900KHz
-6dB @ 1240KHz
-6.8dB @ 5500KHz (yep 5.5MHz!!)

signal 250Hz, power supply 12.6V

[puretube]

Hey everyone,

I'm looking for a simple circuit that provides a very short delay to a line signal (from 0 up to 50 ms). I need to output the delayed signal only.

Is there an easy way to achieve this goal? Thanks!

IF you have both signals *electrically",
the SPIN FV-1 is the best HiFi way...

[johngreene]

@Mark
when raising clock signal level attenuation is worse than clock current issue...
ie. MN3007 @1.6MHz is 10-12 dB less than @100KHz with or without clock buffers...

hmmm maybe I exaggerated a little... 

That's an interesting piece of info.  I never knew that.  Do you have any sense of what the critical point is with respect to where such attenuation becomes more apparent?  For example, would a clock rate of 300khz only lose you 1.3db, or whatever?

(click pic for hires)

I knew Tomas did a good job...  

Btw

just breadboarded an MN3007 with ADA flanger's VCO.
I had more or less the same results as Tomas

Basically:

-1dB from 30KHz to 350KHz
-2dB @ 460KHz
-3dB @ 600KHz
-4dB @ 760KHz
-5dB @ 900KHz
-6dB @ 1240KHz
-6.8dB @ 5500KHz (yep 5.5MHz!!)

signal 250Hz, power supply 12.6V

I've noticed that above a certain clock rate (1.5 MHz?) the signal just blows right through the BBD chip, it no longer changes the delay.