I’m in the process of building my first module using schematics from the performance VCO and AS3340 data sheet. I’m uploading my (messy) stripboard layout here before I build just as a check for me to see if someone spots a glaringly obvious error and if all goes well, I’ll make an edit to this post giving the all clear for anyone’s future use!
UNTESTED
Is this tested and known to work?
I was posting to see if anyone could spot any glaring mistakes. I will edit the post and add a comment when it is fully tested 
it’s better to write “Untested” on your stripboard layout
because we can find this image by doing a search without necessarily reading that it is not tested yet, thx
maybe add the 10M resistor between pin 4 & 5
look here for some info even if it’s for the 1222 VCO schematic
Yeah! I was just reading that thread and that’s definitely something I’ll add.
difficult layout for me, but pin 3 of TL072 it’s missing a 10K resistor to GND 
a little advice when it’s full like that I put resistors on the potentiometer, rotary switch …
For instance you can do something like this with a rotary switch, saving not only space on the board but three of the wires:
I didn’t see that 10k resistor in the performance VCO schematic, however, I did see it in the 1v/oct simple VCO. Also, I noticed the 470k and 100k resistor values are switched between the two layouts.
R9 :
for mine i replic the simple version and add all the others things after (octave, sync H&S, …)
Ahh, I had that attached to pin 4 of the AS3340 directly. I don’t think that should be an issue?
this resistance is necessary, it is in all versions.
R9 = 10K for CEM3340
and 51K is recommended for AS3340.
There are 2 connections to pin 3 of TL072.
forward if your square works
I moved R9 from pin 4 of the AS3340 (to ground) to pin 3 of TL072 (to ground) and it’s still not producing anything.
no, R9 (a resistor of 51K) start to pin 3 of the TL072 and go to GND
“VP” it’s the AS3340 pin 4
so 2 connections from pin 3 of the TL072
I think there’s a miscommunication. I have a wire from pin 4 of the AS3340 to pin 3 of the TL072. Now, I also have R9 going from pin 3 of the TL072 to ground (where I moved it from its original position from pin 4 on the AS3340 in the stripboard layout). Therefore, two connections from pin 3 of the TL072.
sorry for that 
if it doesn’t work there must be something else
have you turn the PWM during your square test, PWM work with Squre wave and it has dead point = without any sound
No worries! Yes, I have turned both PWM and PW pots while testing.
Comparing the square wave part of my layout (which, again, follows the performance VCO schematic) to the 1v/oct simple VCO w square wave layout, I have come across a few key differences:
Sam’s layout has a 10k resistor coming off pin 4 of the CEM3340 to ground, as well as another 10k coming off pin 3 (IN+) of the TL072 to ground. Whereas mine only has the latter (where the 10k is changed to 47k for the AS3340).
He sets a 470k from pin 5 of the CEM3340 to pin 7 (OUT) of the TL072 for PW where mine does not include that at all (following the performance VCO schematic).
He connects pin 6 (IN-) to pin 7 (OUT) of the TL072 directly where mine utilizes the 100k resistor in between.
He uses a 100k resistor instead of a 470k (from the schematic) from pin 5 (IN+) of the TL072 to the central lug on the PW pot.
The 10M resistor that was suggested to be added between pins 4 and 5 of the AS3340 does not occur on either schematic or Sam’s layout which was implemented in mine.
Those are the key differences which were not initially implemented as my assumption is that a bit more experience went into the schematic of the performance VCO rather than his initial simple VCO (therefore changing it up). If any of these points sound suspicious to you, please let me know!
sorry i don’t know, maybe this thread can help you
