Chorus in a 1590A box

[solderman]

Hi  All
I just finished the layout for the John Hollis Zombie Chorus. From what i have heard on Youtube it sounds really good so I have drained my pockets and ordered some 4 MN3007 from Banzai at the ghostly cost of €8.66 Smallbear have them for $10.95  but the shipping and tax costs.

Here is the layout If anyone feel the urge to try. Cut away lug 13-15 on CD4046



http://solderman.fatabur.se/Future%20project/Nevermind.pdf

\\Solderman

[Ripthorn]

Are there not cheaper alternatives for the IC's?

[solderman]

Are there not cheaper alternatives for the IC's?

Analog BBD is the only currency that has managed to withstand and gain in price in spite of the global finance crises as it seems

[solderman]

Hi
Question:
Is the +V to Pin 14 of the CD4046 necessary??. On the original chem its there on R.G:s Schem its not but on R.G:s PCB layout it reapperes
Its obviously some kind of Zener diode protection as i read from the Spec Doc. but what if i leave it out I would like the place so I can omit the jumper under the CD 4046 

I have updated the layout with this and some trace fixes.

//Solderman 

[Valoosj]

Very cool! I was asked to do a chorus in an A size enclosure. I was not to eager to try to shrink the layout...

[Mark Hammer]

I can't really tell from the layout, but do you have suitable decoupling for the two dual op-amps in order to prevent audible LFO ticking?

[solderman]

I can't really tell from the layout, but do you have suitable decoupling for the two dual op-amps in order to prevent audible LFO ticking?

I suppose so since the layout i based upon the John Hollis original Zombie Chorus design and some parts from R.G:s adding (See the PDF file)
Can thet have an effect for nedding V+ on Pin 14 on the CD4046??

//Solderman

[solderman]

Hi
If some one else but me wold be so crasy to try this ..........
Just updated the layout with an Error I found when I doubble checked before I made the PCB
Missed to connect the GDN trace in the middle with GND. Now fixed at R11

//solderman

[solderman]

YES
Just fired up this thing . Works like a charm and sounds marvelous. THAKS JOHN You are a true king of designing good stuff with minimum components. I might shrink the easy vibe in to a 1590  quad Op amps and one LED 4 LDR might do the trick.
But as far as the Zombie, Its stands up to any BOSS, Fulltone  or Digitech you trough at it.

And yes I chickend out and used a socket for the BBD. Those are costly little buggers  you don't wana waist 

PS. layout and dokuments in this tread are updated



//Solderman

[Renegadrian]

[sevenisthenumber]

What does the switch do??? Vibrato?

[solderman]

What does the switch do??? Vibrato?

No
Its more of a depth switch. It alters the intencity. 

[12Bass]

Cool design!  Might try building this with one of the MN3007s I have around.   My guess is that the switch doubles the clock frequency to shift the delay time up to more of an ADT range.

[solderman]

Thanks'
Yes, The C9&10 controlls the VCO of the 4046

[sevenisthenumber]

anyone know of a vibrato built in this size??? I wanna run it in the loop of a delay.

[solderman]

If you turn the speed up on the zombi it can really sound like a Vibrato or a lesley

Or check this out

http://www.diystompboxes.com/smfforum/index.php?topic=81099.msg689475#msg689475

Page 11 post 210

[sevenisthenumber]

If you turn the speed up on the zombi it can really sound like a Vibrato or a lesley

Or check this out

http://www.diystompboxes.com/smfforum/index.php?topic=81099.msg689475#msg689475

Page 11 post 210

Thanks! Im gonna build that true vibe!

[Otsismi]

I etched the nevermind chorus posted by solder man. The pcb I came out with is too big to fit in a 1590a. Does anyone know what the pcb measurements have to be to fit in the 1590a? According to Hammond's website my pcb which I printed from the PDF is like .2-.3 inches too big. Anyone lend some sage counsel?

[GGBB]

I etched the nevermind chorus posted by solder man. The pcb I came out with is too big to fit in a 1590a. Does anyone know what the pcb measurements have to be to fit in the 1590a? According to Hammond's website my pcb which I printed from the PDF is like .2-.3 inches too big. Anyone lend some sage counsel?

http://www.hammondmfg.com/pdf/1590A.pdf

I'm guessing solderman used something other than a 1590A.