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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
PHOBoS' Modular Lunetta
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PHOBoS



Joined: Jan 14, 2010
Posts: 2140
Location: Moon Base
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PostPosted: Wed Jul 23, 2014 1:57 pm    Post subject: PHOBoS' Modular Lunetta
Subject description: [DUAL OUTPUT MIXER] Module
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I made a dual 2 input mixer which can also be used as a single 4 input mixer.

So now I have space for 1 module left! Razz


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commathe



Joined: Jul 26, 2013
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PostPosted: Wed Jul 23, 2014 7:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

It took me a while to see what you did there with the switch. I was confused by the fact that nothing was being disconnected from the op amps. Now I see that what is really going on is switching the A or B side to the opposite output! Smart! You could use it as a sort of send/return and dry/wet mixer too, which is very interesting. Hook your inputs into the a side and then feed the a output through a filter or whatnot and then the out of that back into b! Very practical and flexible!
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PHOBoS



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PostPosted: Fri Aug 22, 2014 2:54 pm    Post subject: PHOBoS' Modular Lunetta
Subject description: [DELAY OSC / COMPARATOR] Module
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commathe wrote:
Now I see that what is really going on is switching the A or B side to the opposite output! Smart! You could use it as a sort of send/return and dry/wet mixer too, which is very interesting. Hook your inputs into the a side and then feed the a output through a filter or whatnot and then the out of that back into b! Very practical and flexible!

Yes in 1x4 mode the signals are added to both channels, and in 2x2 mode it places the input resistors in parallel, doubling the gain.
Didn't think about the dry wet function Very Happy, should work except there is some attenuation on the inputs
because of the high level lunetta signals. So the output level of the filter or whatnot needs to be pretty high.

------------------------------------------------------------

I finished the last module for this modular lunetta Laughing
And this one actually has 2 circuits:

A pulse delay based on this design without the pulse width control. I added a switch to connect the output to the input
so it can be used as an oscillator aswell. I also added a switch to choose between 2 capacitors for a low and high speed.

The other circuit is a comparator with 3 outputs (</=/>). The input amplifiers are configured in such a way that when plugging in
the saw output from the 4046 VCO's or CV signals the output has the maximum amplitude. Squarewaves (which have a higher amplitude)
are clipped at the same level. And because they are already square it doesn't really alter them. The signal also gets inverted which is useful
when only one input is used. Because the input is low the output will be high and the level pot sets a DC reference voltage. This can be used to
turn a saw into a square with adjustable pulse width. I used 2 comparators with a small window so that both outputs are high when the
inputs are equal. The CD4028 (BCD-to-Decimal Decoder) splits it into 3 seperate signals.


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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Mon Feb 09, 2015 2:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Apparently I didn't post the final result with all modules installed. I thought I did though. drunken


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Skrog Productions



Joined: Jan 07, 2009
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PostPosted: Mon Feb 09, 2015 2:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Looks fantastic Phobos Smile
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robsol
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Joined: Apr 24, 2009
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PostPosted: Mon Feb 09, 2015 2:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Amazing! Cool
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rico C



Joined: Feb 27, 2014
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PostPosted: Mon Feb 09, 2015 3:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Awesome, would love to see and hear this beast in action.
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commathe



Joined: Jul 26, 2013
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PostPosted: Mon Feb 09, 2015 7:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

I want to see a group photo of the entire PHOBoS family! Very Happy
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mcop



Joined: Apr 27, 2012
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PostPosted: Mon Feb 09, 2015 10:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's a thing of beauty.
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Tue Feb 10, 2015 3:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks guys Very Happy

commathe wrote:
I want to see a group photo of the entire PHOBoS family! Very Happy

I posted a photo of a setup I'm working on here.
it's only a part of what Ive build but it's a start.

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karczilla



Joined: Dec 10, 2014
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Location: nj

PostPosted: Tue Feb 10, 2015 5:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

looks great phobos. love the colors.

going to haggle you (and everyone else) for module suggestions soon. Very Happy

Last edited by karczilla on Wed Feb 11, 2015 7:25 am; edited 1 time in total
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commathe



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PostPosted: Tue Feb 10, 2015 9:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
Thanks guys Very Happy

commathe wrote:
I want to see a group photo of the entire PHOBoS family! Very Happy

I posted a photo of a setup I'm working on here.
it's only a part of what Ive build but it's a start.
Questions:

    How many years of work?
    Do you have a social life?


I need to know how long it's going to take me to get there and the sacrifices I need to make.
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PHOBoS



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PostPosted: Sat Feb 14, 2015 6:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
How many years of work?

well I've been into electronics for more than 25 years. started when I was about 10, but that was just simple stuff with some lightbulbs,
small motors, switches and batteries. Then some things with flashing LED's (they fit exactly into LEGO Technic holes Wink)
After a while some very simple stripboard things, which didn't work 90% of the time but that's probably not so weird considering I used
a 100Watt soldering gun and very agressive flux (S39). I gradually got more experienced with it getting most of the info from elektor magazine
and build some lightcontrollers and audio devices (mixers, amplifiers). It's when I got internet and especially after I joined here that I really
picked up the pace. I actually didn't really know anything about synthesizers before that time.

Quote:
Do you have a social life?

Not outside of EM,. this is my social life Rolling Eyes

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dougseidel



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PostPosted: Mon Feb 16, 2015 7:01 am    Post subject: Reply with quote  Mark this post and the followings unread

As to social life, it's like, when we make new sound machines etc we are making our own friends! And we can always say, yup, this is my new friend - I made her/him!
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PHOBoS



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PostPosted: Mon Feb 16, 2015 10:48 am    Post subject: Reply with quote  Mark this post and the followings unread

dougseidel wrote:
As to social life, it's like, when we make new sound machines etc we are making our own friends! And we can always say, yup, this is my new friend - I made her/him!

oh I like that Very Happy
I do see them as all having there own characteristics/personality and they play with me as much as I play with them.

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commathe



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PostPosted: Wed Feb 18, 2015 1:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Note to self: less socializing more soldering
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Ruebezahl



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PostPosted: Mon Mar 09, 2015 4:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

This looks really nice! I love the arrangement of the different Color Shades!

Is the Panellayout just your Design printed out on regular paper, and glued to the perfboard? or is there a trick to maybe make it a bit more "sturdy"?

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PHOBoS



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PostPosted: Tue Mar 10, 2015 6:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very Happy, yeah it's just regular paper glued to the perfboard with sprayglue and some clearcoating, although that doesn't protect it
very much. But because of all the bolts nothing will really touch it so except for the screwholes it doesn't really get damaged easily.

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Ruebezahl



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PostPosted: Wed Mar 11, 2015 6:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool! I might try something like that aswell.
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nathanxl



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PostPosted: Thu Mar 12, 2015 3:50 am    Post subject: Reply with quote  Mark this post and the followings unread

I havent been around here in a while, but Id just like to say... This is great stuff Phobos.
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droffset



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PostPosted: Fri Mar 20, 2015 3:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Phobos that machine is amazing and inspiring. Wow!
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Check out the FREE Intro to Lunettas Document
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Edit: Spelling mistakes.
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PHOBoS



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PostPosted: Fri Mar 20, 2015 7:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks nathanxl and droffset Very Happy (how's your alien 555 bug doing ?)
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droffset



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PostPosted: Sun Mar 22, 2015 2:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Smile I still have it! Actually I used it and the lunetta in a synth DIY presentation recently, which made me want to build stuff again. A modular lunetta like yours would be amazing to build.
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