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 Forum index » DIY Hardware and Software » Stickney Synthyards
4543 7-segment decoder
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PHOBoS



Joined: Jan 14, 2010
Posts: 3872
Location: Moon Base
Audio files: 574

PostPosted: Mon Apr 24, 2017 3:13 pm    Post subject: 4543 7-segment decoder
Subject description: lunetta module
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In this thread zloth asked if anyone tried using outputs from a 4026/4033/40110 with other clocks into a DAC to create
unusual "polyrhythms". I thought it would be an interesting experiment and instead of breadboarding I decided to
make a module for it. I didn't use a 4026/4033/40110 but 4543 instead. This one doesn't have a built in counter but
4 binary inputs which makes it possible to select the steps. It also has a couple of other inputs that are useful.

The circuit is pretty straight forward; LEDs on each output and a current limiting resistor + a diode as I have done with most
of my lunetta modules. The inputs have a pulldown resistor except for the Latch input which needed to be inverted, so I used
a transistor for that. The phase input, which inverts all the outputs, also has a switch so it can be controlled without an external
signal.

After building the module I connected the outputs to a 4-bit R2R. The binary inputs where connected to a 10-step
binary counter which was actually a bit harder to realize then I had expected. I did a short test running it at slow
speeds and connecting the outputs of the R2R to the CV input of a VCO. The counter was controlled by an oscilllator
and I did a short test. But I got curious about how the output of the R2R would sound when running it at audiorates.
I first controlled the speed of the oscillator manually but then hooked it up to the output of my Lun-A-Key. Shocked Razz
This thing makes a very nice sub-oscillator, I don't know if it because of the 10 steps or the way the bits are shuffled
but it sound great!

As often I started adding some more things and I now have a patch that I want to record before continuing with other tests.
So sounds will be uploaded at a later date.


4543 7-segment decoder.gif
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4543 7-segment decoder lunetta module
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4543 7-segment decoder.gif



4543 7-segment decoder - 01.jpg
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4543 7-segment decoder - 01.jpg



4543 7-segment decoder - 02.jpg
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4543 7-segment decoder - 02.jpg



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PHOBoS



Joined: Jan 14, 2010
Posts: 3872
Location: Moon Base
Audio files: 574

PostPosted: Wed Apr 26, 2017 4:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

I uploaded a recording here. The module comes in around the 2:20 minutes mark.
And here's a diagram of how I hooked it up to the R2R's.

edit: forgot to mention that the mixer is stereo so one R2R is connected to the left channel the other to the right.


7-segment sub osc patch.gif
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7-segment sub osc patch.gif



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