"moog" all-pass, was: moog hp

[tomg]

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> From: Donald Johnson <donaldj at infomatch.com>
> To: synth-diy at mailhost.bpa.nl
> Subject: "moog" all-pass, was: moog hp
> Date: Monday, March 29, 1999 11:13 AM
> 
> From:           	"tomg" <vco at mindspring.com>
> To:             	<synth-diy at mailhost.bpa.nl>
> Subject:        	Re: moog hp
> Date sent:      	Mon, 29 Mar 1999 00:05:33 -0500
> 
> > You know what??? huh huh?? If you add (10) 10K
> > resistors, one each from the output of each amp to 
> > the non-inv input of the next. Put them in all the fb
> > loops (changing the last amp to a lag circuit) then 
> > connect one to the input side out of the first resistor 
> > and one to the output side of the last then mix the 
> > signals together you get a all-pass filter (phase shifter). 
> > I just tried it cool!...humm I wonder if this means 
> > removing the resistors from a phaser would make it a 
> > hi-pass....
> > 
> > btw: if you try this replace the 0.1s with .01s...it sounds
> > better.
> > 
> > -tg
> 
>  Hey! Where's the schematic?!  :)  
> 
>  Honestly, I'd like to thank you for publishing your results
>  on the mailing list and in your "cookbook".
> 
>  So, ... How about a schematic for this one? I think I know what you
>  did but I don't quite sure about the 'last amp' and the 'lag circuit'.
> 
>  don.

Right here.....;-) Needs more work like a good res loop but this
is the basic idea.

-tg


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