3TrinsRGB-1c Triple CV Comparators - kits available

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FetidEye
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Post by FetidEye » Thu Sep 15, 2016 11:14 am

I got a message from ITead, the new pcb's are getting made right now :party:

and i've updated the want list, see first post

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drumasaurusrex
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Post by drumasaurusrex » Thu Sep 15, 2016 11:18 am

YAY!!
:party: :nana: :bananaguitar: :yay: :sb: :hihi:

:guinness:

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FetidEye
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Post by FetidEye » Fri Sep 16, 2016 2:12 am

basic patch sheet for the comparator.
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N1ck69
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Comparator still available

Post by N1ck69 » Mon Sep 19, 2016 8:51 am

Are there more comparator PCBs available?

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FetidEye
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Post by FetidEye » Fri Sep 23, 2016 1:05 pm

would anyone be interested in eurorack panels?
They would be made from wood, 3.1 mm thick, 10HP

The new pcb's have a slightly different pin layout, so if you have an older pcb, please mention this. I can make panels for the older version too :goo:

interest for now:
-Lento_Zoom 1x

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jondent
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Post by jondent » Sat Sep 24, 2016 8:41 pm

I really love this comparator. Awesome job.
This is a short video showing the effect of the comparator on a external video.
(a old Japanese Samurai film)

The comparator video is the one on the top left.

[video][/video]

Image
Thanks to Cobramatic for borrowing his comparator

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FetidEye
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Post by FetidEye » Sun Sep 25, 2016 3:58 am

nice!

I was thinking of this orientation before.
i'll make some panel designs later

You did not build yours yet?

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jondent
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Post by jondent » Sun Sep 25, 2016 6:11 am

FetidEye wrote:nice!

I was thinking of this orientation before.
i'll make some panel designs later

You did not build yours yet?
Hello, I have stuffed the PCBs but not mounted them into my case yet.
I'm waiting on some mini bananas which I think I'll use in place of the "pin header jacks"
I'll post pics when its done. :guinness:

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FetidEye
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Post by FetidEye » Sun Sep 25, 2016 10:37 am

:nana:

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drumasaurusrex
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IC output is limited by Vcc (which is supplied by 3Trins)

Post by drumasaurusrex » Tue Sep 27, 2016 6:16 am

Hi all,

I had tried to ask about this idea before, but I don't think I was clear (at all), so I poked around with my multimeter to find out for myself (before plugging into 3Trins)...

As I understand... The output of the IC used in the comparator circuit is limited by the Vcc sent to it. So, since it is powered from the 3TrinsRGB headers, the outputs should/will not exceed the HIGH value (within some tolerance I imagine). So I pondered... why *CANT* I (safely for 3Trins) send Eurorack-level voltages to any of the 3 inputs... effectively freeing up the comparator to be an *EVEN MORE* flexible interface module...?

What I tested were some Eurorack modules outputs and also a steady 9v from a battery... in every case, the output coming out of the comparator circuit here did not exceed the value of the input voltage. So... I may be missing something... but I would like to report that I am currently using the comparator to visualize 10 Vpp signals from my Eurorack audio modules on the 3Trins (being compared to the HIGH input from 3Trins). Maybe test your own with a multimeter before you try it yourself (to convince yourself). But I'm having a blast with this... Mainly because now I am not limited to only the outputs from the 3Trins.

Thoughts?

Image

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drumasaurusrex
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Post by drumasaurusrex » Tue Sep 27, 2016 6:41 am

BTW... I know that the Eurorack voltages (10 Vpp) exceed the recommended MAX operating levels for the 74hc14 specified in the datasheet (6V), but it seems to be doing OK, and I have run these chips off of 9V batteries fine before without a regulator.

I should be very clear that this *may yet* prove to be a TERRIBLE idea. But (so far?) the outputs from the comparator do not exceed the Vcc input from the 3Trins HIGH header... which matches how the datasheet describes its performance (see attached pic for Vout Max value). I wouldn't expect this to change (maybe could spike if the IC fried due to higher than MAX V, I suppose...?) I'll keep futzing with it over the next couple days and report if there's any trouble.

P.S. I am a hack and have very little electronics experience. I don't mean to suggest otherwise. I would love any constructive or critical feedback.
Image
Image

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FetidEye
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Post by FetidEye » Tue Sep 27, 2016 9:43 am

hi

It's not only about the comparator ic, the rest of the 3trins is connected to this as well.

you will need something to protect the 3trins !
ask Gijs for advice!

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drumasaurusrex
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Post by drumasaurusrex » Tue Sep 27, 2016 10:04 am

ok... i guess what I'm saying is I monitored all the outputs, and they don't (yet) exceed the 3Trins HIGH output that powers the IC (because of the IC design). So I was trying to suggest from this that perhaps the IC itself provides such protection when/because the Vcc is coming from the 3Trins.
I gather you are saying that is incorrect. And I am fine with being wrong... however, then I don't understand why the maximum output voltage I monitor (regardless of input) never exceeds the 3Trins power source.

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Post by FetidEye » Tue Sep 27, 2016 10:31 am

That's why you have to ask Gijs.
He told me that you can patch stuff into the trins, but you'll need some protection. (diode / resistor of some sort)
He know the specifics

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drumasaurusrex
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Post by drumasaurusrex » Tue Sep 27, 2016 10:44 am

Ok, thanks.

And just to be clear... I am suggesting (not saying I am correct, tho) that the 74hc14 IC provides this protection when it is powered on the Vcc pin by the 3Trins. I am not patching straight to the 3trins inputs... I am going *through* the comparator circuit that uses the IC. In posts above, when I said "inputs" I meant on the comparator circuit. I will ask Gijs.

Thanks again! Love the comparator circuit, it makes the 3Trins an even cooler synth.

Cheers!

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drumasaurusrex
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Post by drumasaurusrex » Tue Sep 27, 2016 11:23 am

I asked about this concept on the FB Video Circuits forum and got a useful response that confirms what I measured. The VCC controls the max output of the IC, even if the Vi exceeds it. However, this can be damaging to the IC (which I thought might be the case)... so its probably not a good idea, or at least not sustainable. I also wrote to Gijs just a bit ago, and I will see what he says. Perhaps I am the only one who cares to try this any further, so I apologize if this is getting annoying to anyone.

Here is a site that someone on FB linked me to that (apparently) confirms.

"Levels of the logic signal will be essentially equal to the power supplied since the input impedance is so high."

http://digital.ni.com/public.nsf/allkb/ ... A8005C5C63

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FetidEye
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Post by FetidEye » Tue Sep 27, 2016 1:30 pm

not at all, it's useful info!

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jondent
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Post by jondent » Tue Sep 27, 2016 6:21 pm

FetidEye wrote:not at all, it's useful info!
gOOD THREAD GUYS.
Maybe some sort of voltage limiter would work? :hmm:
Image

This is from the Doepfer DIY site.
http://www.doepfer.de/DIY/a100_diy.htm

This is a circuit that limits an incoming voltage to the range U1-Ud1.
Schottky diodes (e.g. BAT42) ore germanium diodes are recommended.
R works as a serial protection resistor. A typical value for R is 1k.
U1 is connected to GND and U2 to HIGH.

I haven't tested this yet.

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Post by FetidEye » Fri Sep 30, 2016 4:06 am

Build files for v3 added!

Build manual + BOM + eurorack panel + standalone enclosure panels

Version 3 PCB updates:
-different pinheader layout; 1x 9pin header
-better parts labeling / silkscreens

Panel updates:
-smaller 10HP eurorack panel
-clear patchpoint labels
-clear pot + CV input labels
-standalone file has mounting holes for top and bottom panel

dashiell23
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Hope I'm not too late...

Post by dashiell23 » Sun Oct 16, 2016 10:30 pm

Any chance you'll do another run at some point?

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Post by FetidEye » Mon Oct 17, 2016 2:45 am

yes, this current run, I can put you on the list (there are a few places left)

I'm waiting on the pcb's + some parts, which I expect any moment now.

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FetidEye
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Post by FetidEye » Mon Oct 17, 2016 9:41 am

by the way: i'm going on a holiday tomorrow.
after 10 days i'll be home again. (26th of okt)

dashiell23
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Post by dashiell23 » Mon Oct 17, 2016 9:16 pm

Put me on the list :)

pixels22
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comparator pcb?

Post by pixels22 » Tue Oct 18, 2016 5:58 pm

oooh, so cool! its possible still to order a PCB only? That would be a nice add-on.
thx

pixels22
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Oops, meant PCB with kit parts~~

Post by pixels22 » Tue Oct 18, 2016 6:39 pm

Sorry, meant to add myself to the list for the parts too~~

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