Some simple phaser without fet?

[Crontox102098]

I have days, more than a week I think, looking for a simple phaser effect with as many stages but with a minimal number of components, if anyone has any effect he found it simple yet powerful, or keep it simple and just do the Indeed you have to do please publish it here.

they are grateful to the soul.

[R.G.]

It is difficult to make a phaser with fewer components per stage than one opamp, three resistors, one capacitor and one LDR. Something like the Easyvibe is about as simple as it gets.

The phase stages need a buffer before all of them, a mixer after all of them, and some way to make the phase resistors change. Once you have "paid" for this unavoidable minimum, you can add many phase stages, all identical and with one capacitor, one LDR, one opamp and a few resistors per phase stage. Using dual opamps means each phase stage uses only 1/2 of an 8-pin IC.

I suggest looking at the Easyvibe, and thinking about maybe doubling the number of phase stages.

Sorry - I realize English is not your primary language, so ask questions about what is unclear.

[Crontox102098]

The english it is not my mother tongue, but I have to get used to it, I will travel to USA next year and will look the possibility to stay and live there.

Otherwise I prefer to do a simple 2-stage phaser, I knew that he must place a buffer at the input and the output mixer, my question is that if they have a diagram as simple as possible, preferably OpAmp's done, or just give me an idea of ​​how to do it.

Thanks

P.D: I'm a colombian, If they see that I walk a lot in this forum is because I really like the DIY, I love it, also because I like to see how I can help others as I have 2 years off before going to college I do to make impact for my guitar ... I have 4 effects made until now.

[R.G.]

Look at these:
http://www.hollis.co.uk/john/easyvibe.jpg

http://www.geofex.com/PCB_layouts/Layouts/easyvibe.pdf

[Crontox102098]

Look at these:
http://www.hollis.co.uk/john/easyvibe.jpg

http://www.geofex.com/PCB_layouts/Layouts/easyvibe.pdf

Oh Man! Thank you! now discuss the easy vibe that I have some doubts ... mainly this phaser You can remove 2 stages? and another, instead of TL062, I can use for example a TL072 or 4558?

Other question... u are the legendary R.G.Keen?

[Crontox102098]

Please, i want done the effect... 

[Morocotopo]

Crontox, if you remove 2 stages from the easyvibe, the effect will be very very subtle. Very. I suggest you build it as it is first. It´s not that much difficult to build a 4 stage phaser than a 2 stage one. You can try TL072, 4558, or many other dual opamps, if you use a socket in the PCB you can try different ones as many times as you want.

And yes, R.G. is the legendary, mythical, all seeing all knowing R.G. Or maybe it´s a computer programmmed to impersonate him, I´m not sure.

[Crontox102098]

But if you can with 2 stages? if you notice the effect? I have only two ldr :s

[SISKO]

I *suppouse* that you can leave two stages fixed (replacing the 2 ldrs with a 2 fixed resistor (dont know the values, tough)) and two others variable. It would be somethin like what frequencycentral did with his Cassuality 4 http://www.diystompboxes.com/smfforum/index.php?topic=80456.0

[R.G.]

Sisko is right - if you only have two LDRs, make two stages be fixed. Many commercial phasers have fixed, non-changing phase stages.

The MXR Phase 45 uses only two variable stages. The sound is subtle, but many people like it.

The real R.G. is a programmer, never did any analog electronics in his life. But he did program this chatbot program and fed a bunch of old textbooks into it. 

And I'm pretty sure "legendary" is not the right word.   

[oldschoolanalog]

The real R.G. is a programmer, never did any analog electronics in his life. But he did program this chatbot program and fed a bunch of old textbooks into it. 

Uh...  What gives with this... http://www.geofex.com/   

And I'm pretty sure "legendary" is not the right word.   

"Iconic" is more like it. 
Really; I've said it before and I'll say it again; THANKS for all the great knowledge you have shared through the years, RG!

[pinkjimiphoton]

R.G. = Really Godlyke

rg is the man, the myth, and the legend, all rolled into one with a thick slab of texas wisdom, a smile, and infinite patience even for idiots like me!!

Resident Guru, also applies.

that said..if ya wanna pm me your snail mail address, i can probably send you a pair of ldr's. then you can have a couple more stages.

[Crontox102098]

Profit me much these fets, now I'm testing some things aqlgunas COMBINATIONS of LFOs and phasers, mixers and buffers aver that I get.

[pinkjimiphoton]

carlos,
keep after me... i will send ya a couple parts to play with.

[DiscoVlad]

Late to the party here, but what about a simplified version of the Bad Stone? It doesn't use any FETs or LDRs... Although it does use all 6 stages(?)of a CD4009.
Making it as a 2-stage phaser would cut down on a lot of the 4558s it uses, so it could be worth experimenting with. No idea what it would sound like though.

[Crontox102098]

carlos,
keep after me... i will send ya a couple parts to play with.

I appreciate your help, and I will receive you warmly and will arm shipment arrives just me

As I'm on vacation, I can try to experiment with 2 stage phasers ... Remodel the Univibe, Phase 45 etc ... and upload it in this topic or publish it as main project

[pinkjimiphoton]

looking forward to that carlos!


have you checked out the wobbletron? that's basically a two-stage phaser. i'll try and send ya enough to build at least 4 stages more, let me see what i have in stock,
and like i said, don't be afraid to pester me, i am a space shot.

[Crontox102098]

looking forward to that carlos!


have you checked out the wobbletron? that's basically a two-stage phaser. i'll try and send ya enough to build at least 4 stages more, let me see what i have in stock,
and like i said, don't be afraid to pester me, i am a space shot.

I can't make the wbbletron, i dont have MPSA18 and the Fet's, in my country dont sell

[pinkjimiphoton]

i don't know if it's crucial to use mpsa18 . socket it and see what ya get. i'll look to see if i have some spare jfets, too.

check your pm's