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nonlinearcircuits 2017 modules (bindubba & covfefe added
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8, 9, 10  Next [all]
Author nonlinearcircuits 2017 modules (bindubba & covfefe added
andrewF
masterofstuff124 wrote:
so i forgot to solder any of the Ground tabs from my tayda jacks to the PCB itself(NullA2) / I know lots of modulars use banana leads that have no ground? do I need to take apart my build and connect all the grounds?


That would be the best solution, but you can get away without doing so.
It depends:
if you are using the null-A as a stand-alone synth and just patching between its own modules - no, except for the jack that is used to connect null-A to your mixer/amp.

if using null-A in your modular and everything is connected to the same power supply (so on the same ground) - no

if you have an aluminium panel, just solder leads to the easy-to-access jacks on the sides, that should be enough.
andrewF
Just some info on the Null-A

Current draw:
+12V rail - 135mA
-12V rail - 90mA

Davies 1900H knobs will fit but you will need very delicate fingers; not really the best option, so one DIYer suggested these knobs. You will need splined pots to go with them, something like this.
marto
andrewF wrote:
Just some info on the Null-A

Current draw:
+12V rail - 135mA
-12V rail - 90mA



Earlier you mentioned a smaller PSU specifically for the Null-A, any news of this?

Thanks
andrewF
Yes I just got the proto-type in yesterday, haven't built one yet but it is a slimmed down design I have been using for a couple of years, so should be fine.

It will have holes for spade connectors as well as a 16 pin eurorack connector.

I expect these will be USD8 each.

TheSlowGrowth
Re Null A2:

I checked it out at the superbooth and liked it overall. Here's a couple of things I noticed - it's not meant destructively and by no means an objective truth; just as a feedback.

1) The knobs were much tighter than I expected. In retrospect: I could have known because on the photos from the first post in this thread you can clearly see the size of the jacks next to the pots. I guess that's what happens when you pack so many features in to little space.
Given that the top PCB is mostly used for the pots and jacks, I guess it would be possible to design your own version or build one on perfboard.

2) I played with it quickly but I just couldn't wrap my head around the internal routing of things. I know that there's a manual that clearly states all of this but it would be super helpful to have some sort of indication on the panel (like the golden lines on the 0-coast) just to help remember. It would certainly make the synth more accessible.

3) This thing really needs another mixer section. What if I wanted to run two oscillators into a single filter (needs a mixer) then add a bit of not-100%-wet delay (needs another mixer). Even just a simple three-jack mixer without level control would have been nice. But then, it's DIY and another mixer is easy to add myself.

4) I would prefer having a HP out instead of the BP on the SVF - I could easily make myself a BP from the ladder filter and a HP on the SVF if I wanted to.

Anyways, I guess I can always mod it to my liking. Its a great package overall and I'm seriously tempted to just buy the pcbs and start modding the hell out of it :-)
andrewF
Thanks for the feedback.
Yes it is tight, I packed in a lot. My fingers are probably average sized and I don't have any issues using it.

I hope most people can learn the internal routing after a few minutes with the manual in front of them, there aren't that many connections. After that it should be easy to remember.

The VCAs are internally routed to the mixer, so can just be used as inputs with the pots. This gives 4 inputs to the mixer, but yeh just one mixer.

Easy enough to get HP from the SVCF, cut a trace and add a wire. You won't get BP from the ladder filter tho.
maaaks
thelizard wrote:
In case y'all missed it, Andrew posted a few new ones today:

http://nonlinearcircuits.blogspot.com/2017/04/coming-soon-plague-of-de mons.html


I'm sold on the name alone hihi
marto
andrewF wrote:
Yes I just got the proto-type in yesterday, haven't built one yet but it is a slimmed down design I have been using for a couple of years, so should be fine.

It will have holes for spade connectors as well as a 16 pin eurorack connector.

I expect these will be USD8 each.



Cool, let me know when you're happy with them and the final pricing.
Kirnu
Desperately need more info on the Through o osc!
andrewF
Kirnu wrote:
Desperately need more info on the Through o osc!

The proto-type worked beautifully, just tweaked a few resistor values to get the output signal levels where they should be. I've built 3 different thru-0s over the last 10 years: EN129, Tillmans' trapezoid and this one, a switching type which is also based on an Electronotes design. This one is by far my favorite, easy to use; LEDs indicate when it crosses zero and sounds great.

I ordered a production run of PCBs and panels last night, so should be here in 2 weeks or so.
Kirnu
andrewF wrote:
Kirnu wrote:
Desperately need more info on the Through o osc!

The proto-type worked beautifully, just tweaked a few resistor values to get the output signal levels where they should be. I've built 3 different thru-0s over the last 10 years: EN129, Tillmans' trapezoid and this one, a switching type which is also based on an Electronotes design. This one is by far my favorite, easy to use; LEDs indicate when it crosses zero and sounds great.

I ordered a production run of PCBs and panels last night, so should be here in 2 weeks or so.


Nice. I will definitely get one and a sloth prob. Do you include calibration instructions with the pcb or online? I haven't done an analog osc before but I hear tuning sine phase/angle is a thing, or something along those lines.
ablearcher
in the envelope follower BOM you say:
Quote:
S1JL or similar, optional - for reverse voltage protection
2 SMD, standard power diode 600V 1A, dot on PCB indicates anode (stripe) OPTIONAL


do you mean cathode there?
andrewF
ablearcher wrote:
in the envelope follower BOM you say:
Quote:
S1JL or similar, optional - for reverse voltage protection
2 SMD, standard power diode 600V 1A, dot on PCB indicates anode (stripe) OPTIONAL


do you mean cathode there?


I did, at least I got the dot/stripe bit correct, new baby in the house.........Glad to know people actually read these build guides Hug
mutronic
nice circuits thumbs up
andrewF
Kirnu wrote:
andrewF wrote:
Kirnu wrote:
Desperately need more info on the Through o osc!

The proto-type worked beautifully, just tweaked a few resistor values to get the output signal levels where they should be. I've built 3 different thru-0s over the last 10 years: EN129, Tillmans' trapezoid and this one, a switching type which is also based on an Electronotes design. This one is by far my favorite, easy to use; LEDs indicate when it crosses zero and sounds great.

I ordered a production run of PCBs and panels last night, so should be here in 2 weeks or so.


Nice. I will definitely get one and a sloth prob. Do you include calibration instructions with the pcb or online? I haven't done an analog osc before but I hear tuning sine phase/angle is a thing, or something along those lines.


Sorry missed this post, yes I usually put some info about tuning in the build guides. Everybody has their favorite methods so I really just point out where everything is.
If you have an oscilloscope and a good function generator you could tune with them. I have a Fluke instrument calibrator which puts out accurate voltages in 1V steps, I use this with a Korg instrument tuner, good enough for me (I never care about Western scale when playing anyway)
andrewF
A Plague of Demons - thru-0 VCO.
PCB set - USD26
panel - USD24
panel template
Build guide & BOM



AlanP
Niiice.

What is the name from? It brings Earth to mind for me, and their track "Plague Of Angels".
andrewF
AlanP wrote:
Niiice.

What is the name from? It brings Earth to mind for me, and their track "Plague Of Angels".


I don't know that one, the name is from one of my favorite books:

trip
That cover art is incredible - lazertran custom panel anyone?

Is the 'self control' fm feedback from the sine or somethin more exotic? Really excited for this one.
Larrea
hihi

andrewF
trip wrote:
That cover art is incredible - lazertran custom panel anyone?

Is the 'self control' fm feedback from the sine or somethin more exotic? Really excited for this one.


There are several different covers for this book, but I like this one best. A custom panel would be great, I will look into it.

Yes the self-control is from the Sine via a VCA:

LeftyLogic
Oh that looks phenomenal. Is it a new design or is it based off of an existing through-zero core?
andrewF
LeftyLogic wrote:
Oh that looks phenomenal. Is it a new design or is it based off of an existing through-zero core?

The core is based on ideas presented in Electronotes EN#75 which were a development of suggestions from Bob Moog, it uses analogue switches rather than FW rectifiers. Schematic is in the build guide if you want a peek.
trip
Not sure which thread is best to post in, but I was wondering about the possibility of a few mods to the ota vco. Would it be possible to add a vco/lfo switch? I'm not entirely clear how the ota vco works, but could I do that by adding a larger cap in parallel with a switch and the 2n2 cap like this:



I want to wire the sync input of vco1 to it's fm input instead as well, but I'm not sure which of the opamps on the 074 is the fm in.
andrewF
trip wrote:
Not sure which thread is best to post in, but I was wondering about the possibility of a few mods to the ota vco. Would it be possible to add a vco/lfo switch? I'm not entirely clear how the ota vco works, but could I do that by adding a larger cap in parallel with a switch and the 2n2 cap like this:



I want to wire the sync input of vco1 to it's fm input instead as well, but I'm not sure which of the opamps on the 074 is the fm in.


Yes switch/cap would work, you will need to try a few values to get it where you want.

Add FM on VCO1 to pin13 of the LM13700 via a 100k resistor (feel free to try 47k, you might like it)
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