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.
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 )
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