XO Stereo Clone Theory issues

Fender3D · Post by **Fender3D** » 13 Oct 2022, 16:41

yes

pins 2 and 6 got clock

kiltro · Post by **kiltro** » 13 Oct 2022, 17:23

Shouldnt I have -15v on pin1?
https://datasheet.octopart.com/MN3007-P ... 103261.pdf

Also, why there is also this one around? Vdd and GND are swaped

: Schermata 2022-10-14 alle 10.34.42.png (43.34 KiB) Viewed 558 times

Fender3D · Post by **Fender3D** » 14 Oct 2022, 10:14

MN30xx chips have pin 1 voltage more positive than pin 5, whereas MN32xx chip have pin 1 voltage more negative than pin 5.
What you use as GND is inifluent, as long as pin 1 is more positive than pin 5 for MN30xx

kiltro · Post by **kiltro** » 14 Oct 2022, 15:45

Ok thanks
But shouldnt it work on 15V?

Fender3D · Post by **Fender3D** » 16 Oct 2022, 12:38

on this datasheet https://pdf1.alldatasheet.com/datasheet ... N3007.html you can see diagrams traced with supply voltage up (down?) to -5V.
In my personal experience, I couldn't get MN3007 working very well below 12V, surely really bad under 9V.

kiltro · Post by **kiltro** » 17 Oct 2022, 05:58

Fender3D wrote: ↑16 Oct 2022, 12:38 In my personal experience, I couldn't get MN3007 working very well below 12V, surely really bad under 9V.

Well I've -8.8v on vdd and -8.3v on vgg

Maybe I'm missing something but I dont see any charge pump on my pcb (there is one on some other clone theory schematic).

Fender3D · Post by **Fender3D** » 17 Oct 2022, 10:56

Clone theory and small clone work both @9V.

kiltro · Post by **kiltro** » 17 Oct 2022, 12:52

Fender3D wrote: ↑17 Oct 2022, 10:56 Clone theory and small clone work both @9V.

Yeah you are right.

So, is there any other way to check for power supply stability (beside a DMM with min/max, that I dont have) ?

Thanks for your help

Fender3D · Post by **Fender3D** » 20 Oct 2022, 16:47

You can try and check tracks continuity, while stressing PCB...
And/or check supply voltage, stressing and whacking PCB

kiltro · Post by **kiltro** » 25 Oct 2022, 20:49

So, while I was trying to reverse engineering the schematic I've found that the rotary switch is broken...

It's an Alpha SR1712F-0203-15K0A-N9-N, apparently they are also in Micro Q-Trons
Problem is I'm only finding it at smallbear electronics and at synthcube.com, but since I'm in Italy the shipping would be EXPANSIVE

Someone know where to find these in Europe?

Fender3D · Post by **Fender3D** » 26 Oct 2022, 10:23

kiltro wrote: ↑25 Oct 2022, 20:49 since I'm in Italy

Facevamo prima a parlarci in italiano

kiltro · Post by **kiltro** » 26 Oct 2022, 14:12

Fender3D wrote: ↑26 Oct 2022, 10:23
kiltro wrote: ↑25 Oct 2022, 20:49 since I'm in Italy
Facevamo prima a parlarci in italiano

Lol