Phaser shift Exponential notches and slew rates

[markphaser]

In the phase shift network the capacitor and resistor(LDR) is charging and discharging exponential so it moves the Notches and frequencys in a exponential curve?

Does it move the notches linear or exponential?

How do i change the RC Emphasis? in a phase shift network?
How do i change the RC pre-emphasis? in a phase shift network?
HOw do i change the RC de-emphasis? in a phase shift network?

Transistor phase shift network RC time constants VS a Op-amp phase shift network RC time constants

Op-amps have "slew rate" times so this "adds" more offset time to the Charging (growth) and discharge (decay) time

What does the "Slew rate" do to the timing of phase shift network?
What does the "Slew rate" do to the notch movement?

Charging(growth) + (op amp) Slew rate=
Discharging(decay) + (op-amps) slew rate=

The Charging and Discharging times are not linear so the notch movements are not linear but exponential movements

How do i make the notches move Reverse log or square root curves?


The first waveform is called the "Sine"  Dry signal
The Second offset waveform is called the "Co-sine"  phase shift waveform#1
The 3rd offset waveform is called the "Tangent" phase shift waveform#2

[Sir H C]

You don't want slew rate (op amp) to have anything to do with it.

Dude, take some classes, read some books, get the basics, you are asking the equivalent to the esoterics of string theory when you don't know classical physics...

[PharaohAmps]

Mark, that's ten separate questions.  What in the world are you trying to learn here?  From the tone and frequency of your past postings, it seems as though you spend all day on this forum just asking questions.  From the tone and frequency of your follow-up posts, I'd also guess that you're not learning anything from any of this.

I'm not going to flame you, because we were all new to this at one point.  But have you ever tried to build a phaser, "markphaser?"  Seriously, if you would go invest some money in a breadboard and some parts, you could probably find enough there to keep yourself busy for days.  When you get bored with the breadboard, maybe sign up for some basic electronics classes at your local community college.  The comm. coll. by me has a couple of good beginner electronics courses that include "AC/DC Circuit Analysis" and "Linear IC Applications."  You could learn enough from either of those classes to keep yourself busy for several months.  You might even learn enough to start asking some questions that might help you design a phaser, instead of spouting off a bunch of goop about maths that you don't understand yet.

I'm with Sir HC - build something.  Read some books.  Take some classes.  Go find an engineer that you can pester in real life.  A lot of these concepts are very cool and easy to understand if someone just draws you a picture.  Drawing pictures is very easy if you're in the room with someone, and rather more difficult if you're just typing on a BBS.

Good luck

Matt Farrow

[Mark Hammer]

You have too many questions too close together.  Try asking just 4 or 5 and it will be easier for us to answer them.

As far as exponential vs linear sweeps, a big part of this is in the LFO not the phase shift networks.

Read this article: http://ampage.org/hammer/files/hypertriangleclock.gif

...and maybe this one too: http://ampage.org/hammer/files/Hyperflange.PDF

Bothe the Small Stone and the Ross Phaser use a similar LFO waveform as the one described in those articles.