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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: 1853
Location: Moon Base
Audio files: 361

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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"My perf, it's full of holes!"
http://phobos.000space.com/ http://www.acidtrash.com/ Stickney Synthyards
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commathe



Joined: Jul 26, 2013
Posts: 89
Location: Beijing
Audio files: 5

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



Joined: Jan 14, 2010
Posts: 1853
Location: Moon Base
Audio files: 361

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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_________________
"My perf, it's full of holes!"
http://phobos.000space.com/ http://www.acidtrash.com/ Stickney Synthyards
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