Noisey 5v USB supply

Started by philjynx, July 06, 2017, 02:26:08 PM

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philjynx

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gumtown

If you are using the TEENSY, then itself has a 5v to 3.3 volt switching regulator built in,
it should be able filter the supply reasonably well.
I would look at the inputs on your Teensy, if you are using an analog input for A/D conversion, is that filtered with an input capacitor?
Do you use switch debouncing code? or for analog inputs, render the sampled code down to 7 bit steps before using check code to look for input change.

(example: comparing previous sample to current sample,
if(previous_read != current_read) { sendMidi(current_read);  previous_read = current_read; };
if not the same, then the input has changed and send midi output message.
If it is done at 7 bit resolution, the change is less 'trigger happy' than at 10 or 14 bit resolution.)
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gumtown

What happens if you "pull up" the pushbutton inputs quite hard (1k ohm on each).
Free "GR-55 FloorBoard" editor software from https://sourceforge.net/projects/grfloorboard/

gumtown

You are correct, the teensy 3.3v regulator is Linear.  :)
Free "GR-55 FloorBoard" editor software from https://sourceforge.net/projects/grfloorboard/