Zombie chorus with anti tick mod 1590b layout?..

[anotherjim]

I never seen nowt guv.

That pin15 Zener voltage can be almost anything it wants.
For a TI CD4046 chip it's 4.45v to 6.15v. Philips HEF4046 it's a nominal 7.2v with no promises of a min or max.
Like any other Zener, it ought to be run with some current limiting resistance in the feed.

To work as Rob has it I'm guessing that every time a tick pulse pops up over the supply voltage, the Zener clamps it down.

[Kipper4]

Egor It's alive, alive I say.
Took me hours to debug the lfo but my Zombie is working.
Go figure the timing caps aint 1uf but 1nf, it sinks in eventually. Who drew that??
Hate having really bad short term memory.....

MN3007 CD4046 version.

Now what are some mods please.
Timing caps? using 1nf's
Pin12 R?       using 100k

Tried the pin15>+9V results no ticking.
Thanks Rob.

[Kipper4]

LM358 lfo
TL072 Audio path

[deadastronaut]

cool glad its working with no ticking man....at long last a cure...

[Kipper4]

Which lfo are you using please Rob?

Are there any no no's with the lfo.

How would it sound with a square wave?

[Kipper4]

So far mods I've tried and like.

Mod 1
Instead of 100k clock R it tried some different values
Least ohms I like was 33k most 470
So I tried 33k series and B500k pot pin 12 of CD4046.
The pot didn't have the same impact I thought it might, you can't just turn the pot and hear it.
Abandoned that in favour of a switch with either a 100k, 220k or 100k, 470k selection.
You can defo hear the difference on a switch.
Might be some kind of pot interaction dunno what that's all about.

The timing cap mod.
Originally 2x 1nf
Love that.
However I like 2x 220pf
All the while maintaining the Clone mod.


Thanks for the heads up DA on some possible mods.

Has anyone tried a series 10k>pot as a varistor? For the dry path.
You think this would go screwy too?
Let's face it a pot doesn't take up much more room in a build than a switchs footprint.

Just gonna leave this here as I'll probably reference RG's values in future.
Inc schematic.
http://www.geofex.com/PCB_layouts/Layouts/zombie.pdf

[Kipper4]

The Zombie Chorus work with a StompLFO chip too.
More pitch shifter at high depth setting.

[Kipper4]

Quick question is it ok to change R19 and R18
Schematic for ref
http://www.geofex.com/PCB_layouts/Layouts/zombie.pdf

I understand the R on pin 12 I've been swapping it out.
But would swapping the R to pin11 make a difference.

Is it a case of one sets the low and one sets the high?

If so how low can R to pin11 go?
Thanks

[deadastronaut]

hi rich, i'm using the lfo from my dreamtime delay....works nice, and led pulsing too....


still working . no magic smoke... 

[bluebunny]

Do you still have the short going to pin 15 from pin 16, or have you current-limited it with a small resistor?

[deadastronaut]

pin 15 still at 9v.....havent tried a resistor yet.

edit: i'm testing taming the input on it, (and feeback gain) as it distorts a bit with  humbucker when hit hard.....

[Kipper4]

Thanks Rob.
I'll go have a lookie see.
I figure as long as the CD4046 is in the bbd input. I can throw any old lfo at it and just see.
There's a PSO on the same breadboard. Might yock her up and listen.
Btw did you see that one of the kit chorus has a tri to sine converter?
I'll leave a link.
This is fun. Not sure mine qualify as a chorus really at all settings.
In a good way.


Edit, still have pin15>+9V no r

[deadastronaut]

rich, whack a guitar with a good humbucker in it....and see if you get any clipping/distortion...??

[Kipper4]

Will do. Hit it with some buckers. 
I'll get back to you and consider a pad if needs be, what about actives? Hmmmmmm

[Kipper4]

Here's the byoc mega chorus.

http://byocelectronics.com/megachorusschematic.pdf

See how they deal with the sine wave from the lfo

[Kipper4]

Defo prefers single coils Rob.
one of my bucker babys sounded ok the other must have hotter pick ups and the zombie didnt like it as much. More noise/dist not sure.
I put a 1k at input to try to tame it a little but its probably gonna need a more elegant and in depth solution. It'll do for initial trials though.

[anotherjim]

When you have the ticking, I'm curious to know if it gets chorused or not?

[duck_arse]

..... yock her up .......
Btw did you see that one of the kit chorus has a tri to sine converter?

I played breadbord w/ that topology tri/sine converter a long while back - I seem to recall it could hypersine to hypertri, as well.

[Kipper4]

Sweet

[deadastronaut]

still having issues with it distorting/clipping with humbuckers .....single coils are fine.

might have to clamp down the feedback resistor and then add a recovery stage....hmmmmm


thoughts?