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Post by rodney on Apr 15, 2021 23:27:33 GMT
I was looking at the wiki page for the DIY module and thinking how to get it started with some projects to fit the DIY kit module.
I'd like to invite people to suggest modules that would make good use of the module's default format of 3 knobs, 3 LEDs and 3 switches.
Maybe to follow a template that we could copy into the wiki as an ideas section for the DIY module entry?
For Æxample:
Name: compÆrator x 3
Description: A thing that gates/triggers, and/ or maybe passes voltage when the input voltage is above or below a reference voltage. It would have 3 independent comparators in it
Knob 1: comparator 1 threshold (voltage at which stuff happens)
Knob 2: comparator 2 threshold Knob 3: comparator 3 threshold
Switch 1: comparator 1 mode (trigger on crossing above or below threshold? trig or gate?) Switch 2: comparator 2 mode Switch 3: comparator 3 mode
LED 1: comparator 1 active/triggered
LED 2: comparator 2 active/triggered
LED 3: comparator 3 active/triggered
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Post by rodney on Apr 15, 2021 23:41:11 GMT
Name: Teensy thing
Description: something a bit like Grains, but with a Teensy instead (maybe with a 12 bit DAC added?) knobs and switches go to input pins. LEDs go to output pins.
If it's a 3.2 Teensy, there is a compatible version of Mozzi (but not Grains, as far as I know) that possibly uses the built-in 12bit DAC. The teensy 4.0 and 4.1 (maybe too big for this board?) would need an added DAC or codec chip to get a nice audio out, but could use the teensy audio library which is fun.
Knob 1: parameter 1
Knob 2: parameter 2
Knob 3: parameter 3
Switch 1: whatever 1
Switch 2: whatever 2
Switch 3: whatever 3
LED 1: whatever 1
LED 2: whatever 2
LED 3: whatever 3
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Post by keurslagerkurt on Apr 16, 2021 13:05:55 GMT
Name: compÆrator x 3
Description: A thing that gates/triggers, and/ or maybe passes voltage when the input voltage is above or below a reference voltage. It would have 3 independent comparators in it
Knob 1: comparator 1 threshold (voltage at which stuff happens)
Knob 2: comparator 2 threshold Knob 3: comparator 3 threshold
Switch 1: comparator 1 mode (trigger on crossing above or below threshold? trig or gate?) Switch 2: comparator 2 mode Switch 3: comparator 3 mode
LED 1: comparator 1 active/triggered
LED 2: comparator 2 active/triggered
LED 3: comparator 3 active/triggered
Cool idea rodney! I quickly whipped up something on a post-it, not tested yet on the brAEdboard but pretty sure it should work. First pot controls the comparator treshold. Second pot can control the output voltage when the input CV is above the treshold. You can leave out the pot if you just want a 5V gate signal while the comparator is triggered! Not 100% sure if the LED will get enough current from the MCP602 to shine bright enough, will have to test it. But i don't want to use a transistor circuit for that as these are not in the brAEdboard kit. Resistor R1 should be the smallest one in the pack, I'd use one of eg 220 ohms. Its just output protection. Not sure if the switch will work cleanly, as mechanical switches often have an 'oscillation' in the, ie when you press them they tend to latch/unlatch multiple times in a split second which may cause a flicker rather than a clean output gate. Testing for the weekend! (or for a fellow experimenter to find out  )  |
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Post by keurslagerkurt on Apr 16, 2021 16:02:47 GMT
Verified the circuit above for the CV switcher on the breadboard! Only didn't add the switch (yet). Circuit works as intended, pots control as intended, I also checked the maximum current output ratings of the MCP and it should have no problem powering the LED's included with the brAEdboard (as confirmed on the breadboard too). However, if you want to use your own superbright 5mm LEDs, i advise to use a transistor switch for the LED. So, input can be anything, as soon as it passes a treshold set with the first pot, the output goes from 0V to the CV that you dial in with the second pot! Breadboard build (don't mind the MCP side with the cap, was trying to make a trigger circuit).  VID_20210416_173607182.mp4 (1.51 MB) Varying the first pot to change the point where the circuit turns 'on' (blue is input cv from AE, yellow is output of the circuit)    Varying the second pot to change the output CV voltage   Hope this is a fun simple circuit for some ppl! I used 1k for the output resistor & 1k for the LED resistor. Opamp is half of the MCP602 |
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Post by rodney on Apr 20, 2021 1:10:23 GMT
Thanks! I'll definitely give this a try.
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Post by funbun on Feb 12, 2022 11:04:36 GMT
Did you guys ever build this comparator?
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Post by keurslagerkurt on Feb 12, 2022 12:51:55 GMT
Did you guys ever build this comparator? I verified and used the circuit from the Post-it above 😊 if anything is unclear about it, feel free to ask! |
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Post by pt3r on Feb 13, 2022 13:30:45 GMT
Is that diode symbol the led?
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Post by keurslagerkurt on Feb 17, 2022 17:16:55 GMT
Is that diode symbol the led? Yes thats the one! |
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Post by rodney on Feb 20, 2022 21:36:15 GMT
Did you guys ever build this comparator? It slipped down my ToDo list, but I still like the idea. (I'm mired in my ribbon controller thingy at the moment)
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