Another question about the Jacks. The link in the filter BOM
TruConnect 3 Pole Box Style Jack Socket | Rapid Online goes to a stereo switched socket. Does it need to be stereo? Also as I am in Australia I am trying to source things locally. I have found some on RS that I think are the same but would like someone else to have a look before I buy a bucket load. Link >>
https://au.rs-online.com/web/p/jack-plugs-sockets/9131033
Thanks
Chris
sorry about that! but yeah for future most modules use pretty much the same things, jacks, pots, knobs, resistors etc! so if your planning to build a few I think even Kosmo modules from other designers they share a lot, so even if you buy too many of the right jack sockets for instance they always end up getting used 
Thanks Sam. I just found that Mouser have them as well. I think I will get those. Cheers
NYS232 REAN | Mouser Australia
Deciphering the BOM spreadsheets is half the fun.
A few of us have used these/
Hey guys, so after a week of troubleshooting I still canāt get this beast to work 
These are my observations:
When I flick the switch to Highpass mode, I hear the input signal of all 3 inputs. (The level knobs work fine) however when I switch to low pass mode, dead silenceā¦
But!: the resonance and also the frequency pot are basically without function. Just the resonance works as a kind of level pot when I turn it fully open.
The two leds are lighting up brightly during switching the hpf/ lpf selector but remain off in low pass mode and very dim in high pass mode.
Also the frequency pot has 12v at one side and -12 on the other giving the divided voltage at the middle pin
These are the measures I already tried:
All solder joints probably 4 times reflowed
Swapped the Tl074 and the 13700
Measured the input voltages for the two icās which where as expectedā¦(just slight differences to 12v like 11.86 or 11.95)
Has anyone a idea of what could be the problem hereā¦? Would really appreciate your help!
Love from Hamburg 
hey up morpheus follow the trace on the board from the middle leg of the frequency potentiometer to where it goes. it sounds like its giving no voltage to the filter circuit. see if there is any voltage or anything with your multimeter on pin 1 or pin 16 of the lm13700. if you look at the pinout youāll see this is the controlling pin for the lm13700, (search lm13700 pinout) and youāll see what I mean.
if you are getting nothing on that pin or - voltage. if there is no + voltage on it which I suspect there isnāt then double check these items
R43 this comes from the middle leg of the filter cutoff wiggle it look and see if the solder movses on the other side, this signifies a cold joint this would be the problem.
wiggle q1 and q2 do the same look on the back and see if any of the joints wiggle. if they dot hats the problem!!
R30 and R15 double check those too like above.
check the same with C8 and R18.
make sure pin 12 of tl074 is a good joint
thats everything between the filter cutoff pot and the lm13700
if its still doesnāt work make sure the right transistors are in the holes and are also the right way round.
if still no joy double check R18 is a 470k resistor.
if still no joy swap the transistors with new ones
Howdy, I just finished assembling my 1113 and unfortunately Iām not getting any audio out of it. The LEDs react when I turn the Resonance and Cut-off pots but thatās about all I can get it to do. Iāve tried all 3 inputs with the switch set to high and low. Iāve refloated every joint multiple times, making sure to use a higher temperature and longer contact time with points that connect to the ground plane. Iāve replaced the ICs, transistors and most of the components on the board. Iāve confirmed thereās voltage on pins 1 & 16 of the LM13700 in case it was something similar to morpheusā issue above. Does anyone know any more steps I can try at this point? Thank you.
Edit: Sorted, see resolution below.
Need an oscilloscope really and see whatās going into/out the OPAMP.
One of the only modules I believe without the actual schematic on the site.
Thereās a Kicad file on Patreon, I donāt know if itās posted elsewhere.
I canāt couldnāt find it for a while. Patreonās a horrible place to archive stuff.
In the Dropbox folder via the zine zone, under PCB projects or something like that?
So I figured this one out. It was the jacks, I hooked up the wrong legs.
Huh, weird. Iāve never seen a jack like that before. All mine have all five terminals the same (with holes). I can see how youād make that assumption, though even with that assumption youād have to make a further guess as to which way around to make the connection.
Anyway, the terminal on the beveled corner is sleeve, and from there clockwise: Ring switch, ring, tip, tip switch. Normally sleeve connects to ground, tip connects to signal, tip switch to nothing unless some normalization is needed, and ring and ring switch to nothing unless itās for a stereo signal.
thats a really interesting version of that jack lol
Cheers, thatās actually really cool to know, thereās a lot more to these things than I thought.
The jacks are REAN NYS232ās that I got off Mouser. Other than this mishap theyāve worked great in all the modules Iāve built so far.
Thanks @lookmumnocomputer and all you other awesome nerds 
Iāll also leave this here as a āsolutionā for my problem in the case someone else runs in to the same misery 
So I Followed all the steps Sam suggested and measured the voltages. And as he suspected there was no voltage at All on the lm13700ā¦ tested all the components which seemed fine.
So off I went ordering some spare Bs558. Now I desoldered everything and had a look at the socket for the 13700 which looked a little messed up after reheating the pads probably 10 times until nowā¦ what I found out finally was that I damaged two pads so the copper trace of the pcb wasnāt connected any moreā¦
So i carefully scratched off the protection film over the broken copper trace and carefully soldered a little bridge to the leg of the socket.
After an hour of feeling like a heart surgeon I was finally able to enjoy the sweet sweet madness of the ms20 filter
One little final question remains:
I didnāt quite understand the resonance preset trimmerā¦ in which direction is it at maximum in which at minimumā¦? Hahaha I turned and turned but it didnāt seem to make much of a differenceā¦.
However thanks all you awesome people
may i ask when the v2 is coming out, its been out of stock for a little whileā¦i moved my original one to my other box to use with the gameboys so there is an empty hole in my bass line ready to be filled once more :)))
