Sorry for the new topic but the build forum for the megadrone hasn’t had much action in over a year and keen to remedy my issue.
Built the megadrone and all oscillators are working, master tune is working, output working, all LEDs are working but I can’t get the cv to respond to the cv out of my arturia microfreak.
I have never really used CV before so maybe am making an obvious mistake.
I have used a 1/4 to 1/8 inch adapter and used a normal mono guitar cable to go from the microfreak into the CV input.
I have also played around with the trimmer pot on the back whilst adjusting the cv amount as I read in the build forum that sometimes this is needed to find the sweet spot etc and that it may have been an issue with the cv not working, still no joy. I did feel like I could hear a very faint effect at one point but it was so faint I can’t be sure.
Any ideas as to what this might be please?
Let me know if making a new topic is an offence unforgivable and I will delete
Thanks for the reply, was wondering if the CV did work from arturia but not sure how to check, any tips for the best way to do this please? is it just a multimeter on the jack itself tip and ring on a normal voltage multimeter setting? If so what sort of voltage should I be getting please?
In terms of the mosfets I used the ones in the BOM and I think I have them right way around, first time I have used a mosfet but couldn’t see any clear orientation markings etc so paused the lmnc youtube video on the product page where it shows the components installed and so copied that orientation.
So i used the DCV setting on my multimeter and put positive to the tip and one behind and got a reading of 4.89 so presume that means it is sending something out?
Ok great, pretty sure this is right…will change the resistor and see if that helps the cv to register as pretty sure the microfreak is outputting cv ok.
Really appreciate your time with all this chief, also love your modules, eyeing up building a few!
ok replaced R27 with a 2M resistor (2x 1M soldered together) I managed to get some cv action going for some of the oscillators but I think because I used 3 different values of caps 1uf 22uf and 47uf it meant I couldn’t find a trimmer and master tune position that would control the pitch for all oscillators at the same time. Guessing this is something to do with something I am yet to fully understand!
BUT I don’t think the design was intended to be a 10 voice multi octave cv controlled synth device…fun to play with regardless and great to get my first LMNC build finished and working.
If any of my above points are wrong or there is a fix then I am all ears, soldering iron at the ready.
Love the community here, appreciate all the help and inspiration so far
Not sure to understand, i don’t have Megadrone but even with different cap values you can tune each oscillator with their own pitch pot, and after you can change the pitch of all oscillators with the master pitch pot which is also controllable in CV .
So all oscillators should be affected by the CV
ah ok cool so I am misunderstanding how cv works etc. Have done some more testing this morning and I can get 5 of the oscillators to all work via the cv.
Would the reason the others are not working potentially down to the mosfet chips do you think? Not used them before and wondered if I damaged any pushing them back, suppose I can run a multimeter over them to see if I get any voltage…
Are you sure it’s not working, aren’t they at such a low pitch value that you can’t hear it ? test with a high pitch.
maybe check and redo the solder points on the 3 legs of the mosfet and CV connection of those that do not work
It is really weird cause two caps of the same value are interacting with the cv differently.
I can adjust the trimmer and master tune to get 5 working together but then if i just focus on 2 with the same caps, 1 working as part of the 5 working and 1 that was not I can adjust the trimmer so low that the non working one works but then the trimmer is so low that the other 5 that were working before stop making any noise. Which doesn’t really make sense to me.
