systech phase shifter schematic even/odd cycling trimmer

[markphaser]

I forgot the name of what u call it but i have read about the trimmers that set the FET's in the phase filter stages
i remember u called them "soft or hard" reaction or something.

But yes i did turn the trim pot inside the system phase shifter and it did do the even or odd cyclicing

Even cyclicing:  throb,throb,throb,throb
odd cyclicing: throb,fading out,throb,fading out

I know u mention about the Soft and hard FET biasing or something i don't know if this is the same but there is trimmers
between the output of the LFO and FETS that either bias the FETS to react difference soft or hard turning off and on or
the slew rates or change the "taper" of the FET resistance

[toneman]

mark,
the even/odd thingie has to do with the *number* of (jfet) stages.
Not, the "cycles".
The "bias trimmer" U keep referring to, is usually used to *bais* the jfet to the right "area",
so that, when the jfet "acts" like a variable resistor in the phaseshift stage, it does so smoothly and in a linear fashon.

SURE wish someone would post a link to the schemo  (?)
But, it *sounds* like it's just a garden variety jfet phaser.
How many stages??  I don't know.
For a **really** unusual phaser, look at the SynthiHiFli phaser !!!
T

[markphaser]

even/odd thingie has to do with the *number* of (jfet) stages.

Thats a even/odd notches

4 stages= even notches
6 stages= even notches
8 stages= even notches
10 stages= even notches
12 stages= even nothes

Where do u get a odd number of stages ?

JFET produce harmonic distortion is superimposes onto the AC wavefrom throught phase shift network thats why u get more
even harmonics

The "bias trimmer": the jfet "acts" like a variable resistor in the phaseshift stage it does so smoothly and in a linear fashon
yes i understand that


EMS SynthiHiFli phaser? i never seen the schematic for that but i think its close to the Mu-tron Bi phase
                                   unless its a Odd stage phaser?

[toneman]

4 stages= even notches
6 stages= even notches
8 stages= even notches
10 stages= even notches
12 stages= even nothes

Where do u get a odd number of stages ?

It's where the *feedback* is tapped from,
Not the actual number of stages.

EMS SynthiHiFli phaser? i never seen the schematic for that but i think its close to the Mu-tron Bi phase
                                   unless its a Odd stage phaser?

Not even close to the same......

[markphaser]

EMS SynthiHiFli phaser is in the HiFli combo its not a stand alone single phaser box right?

[toneman]

EMS SynthiHiFli phaser is in the HiFli combo its not a stand alone single phaser box right?

right.  the phaser is in a big box with a bunch of other effects.
and.... it should be "EML".... Electronic Music Laboratories.
Don't know what happened to the edit function(?)
There used to be a little "edit" button on the page(?)....
Now, i don't see any...(?)
T

[markphaser]

Toneman whats so special about his EML phase shifter circuit? the LFO ? the FETS? the LDR?s or phase stages ? and why?

[toneman]

Toneman whats so special about his EML phase shifter circuit? the LFO ? the FETS? the LDR?s or phase stages ? and why?

remember prevously, how U were asking about the number of stages??
answered
remember how U were asking about  what constitutes odd/even phasing??
answered
the "uniqueness"  of the EML is in **how**  the feedback from the stages is done.
(but, i guess that's true of all phasers(?)
now, that that's answered.........

For further questions on the dark side of the phases,
U need to do as john fogerty  said:  Keep on Googlin'

t t t t t that's all from me......................................................
excuse me while I automatically shift phaserlylike outa here ............. warp nine, Mr Sulu .......
(wooshing sounds)

T

[markphaser]

Yes the same guy made the small stone and microsythn David %^&*ell

Yes the feedback can be tapped at any stage like the mxr phase 180 and small stone to get odd feedback

What happens when u tap off at different odd stages vs even stages from phase shift for feedback parameters?

[markphaser]

?

[puretube]

Bode "played" with cyclic phase-inversions...
(

...periodic sequence of inversion and noninversion...

)

[markphaser]

What is cyclic phase-inversions mean please?

[puretube]

What is cyclic phase-inversions mean please?

even cycles: i mean u hear the swirl evenly everytime  1,2,3,4   swirl,swirl,swirl,swirl
odd cycles: i mean u hear the swirl   1,nothing,3,nothing  swirl,nothing,swirl,nothing

with the exception of 1 & 3 in above mentioned "even cycles"...
(so: not everytime, but every even time).

[notchboy]

IIRC the EML phaser uses a diode ladder, as opposed to FETs, OTAs, or Vactrols.

[markphaser]

What is cyclic phase-inversions mean please? do u mean its a LFO with a polarity or phase reverse?

the EML phaser uses a diode ladder, as opposed to FETs, OTAs, or Vactrols.

What kind of diode ladder configuration please?
(I'm looking in my electronic books about diode ladders and i don't see anything about them at all)

Whats the difference between a diode ladder,JFET,Mosfet,FET-based,OTA,Vactrol phasers?

[toneman]

diode ladders are mentioned here--

http://www.zephyrtechnology.com/UFO_Technology/Build_Flying_Saucer_/body_build_flying_saucer_.html

all U have to do is google!!!!!!   

instead, U ask 4 more Q's for every one that's answered   

T

[markphaser]

is that link for real?

[notchboy]

http://www.zephyrtechnology.com/UFO_Technology/Build_Flying_Saucer_/body_build_flying_saucer_.html

markphaser, is that you in the photo (wearing a tie)?

btw, I think the even/odd trimmer is used for zeroing the polarity of the neutron flux.  Some of the Zvex pedals, and older Wiard modular gear, use that trick.

[markphaser]

very funny 

[puretube]

EMS SynthiHiFli phaser is in the HiFli combo its not a stand alone single phaser box right?

right.  the phaser is in a big box with a bunch of other effects.
and.... it should be "EML".... Electronic Music Laboratories.

err, studio, or labs ?

http://www.sequencer.de/pix/ems/ems_hifly.jpg


(sorry - my eyes...)