Hi everyone.
I know, it's probably the hundreth topic abouth that circuit but I'm building it and would like to share something with you.
I found this layout on effecslayouts :
http://effectslayouts.blogspot.com/2017/07/zombie-chorus.htmlBut, like some comments point out, there are some mistakes/differences between the board and ths schematic that's supposed to be based on
(http://www.pisotones.com/Zombie/MBC/Z2/ZCh2.htm).
I found another good schem here at Geofex :
http://www.geofex.com/PCB_layouts/Layouts/zombie.pdfI'm going to base my comments on the geofex schem from now on.
Anyway here are the mistakes that were pointed out :
- C8 (10nf) is missing, and there is a 10k resistor in its place (between pins 6 and 7 of the 4558)
- R14 (100k) is missing (between pins 1 and 3 of the 4558)
- R13 is 15k on geofex schem, not 10k (but some schem show a trim here between R12 and R13, to get 4.5V at Vb)
- vibe 2 (there you have to look at the pisotones schem) isn't going if the right place, it should be between R5 and R10
- some power filtering caps are missing : C11 and C12
I tried my best to copy the original perfboard schem and modify it to fix those problems, here it is :

As you can see I reorganised some things and coloured in red the parts I added/modified (I plan to put sockets there to check if it does work without them).
If someone could have a look and tell me if they think it's good that's be really cool !
Btw, next step : adapt it to MN3207 using experimentalistanonymous schem (
https://www.experimentalistsanonymous.com/diy/Schematics/Chorus/Zombie%20Chorus%20MN3207%20Based.jpg)