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Circuit for Randomized Pulse Width Modulation

Sure, the ATTiny series doesn't have an onboard DAC but it has hardware PWM channels which top out at around 32kHz base frequency for an 8MHz internal oscillator clock, 8 bit for the PWM. For a max frequency output say 1/10 lower a two pole Bessel should work fine to filter that, maybe even just a buffered RC.

The internal pseudorandom modulation source for the PWM output could be

1-dimensional Perlin noise:
Reply to
bitrex
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10 minute proof of concept, this is a couple octaves summation of 1D Perlin noise/pseudorandom coherent noise modulating the PWM duty cycle and driving a yellow LED from the PWM output of an AVR. Looks a lot like one of those flicker-flame candle LEDs. A bit late for the holidays oh well...
Reply to
bitrex

they have a constraint they don't wanna mention because if they mentioned it, whatever it is, it would be clear what they were doing which is probably trying to get work done for free, the type of work most people want 2 get paid to do. It's a fishing expedition, fishing for brains! Heh!

Reply to
bitrex

often yes

I'm sure there's a variety of explanations in differing cases. Some likely candidates spring to mind:

  1. they can't talk about what they're making
  2. they just don't want to talk about what they're making
  3. they've made their mind up on aspects of the design that more or less none of us would agree with, and they aren't interested in re-questioning those decisions
  4. they have invented something, or think they have, so don't want to talk about some aspects of the thing such as what they're trying to achieve
  5. sometimes I think they just don't see how the questions we ask are relevant
  6. sometimes their communication skills are simply inadequate
  7. they're looking for something very specific & most/all responses don't get them what they're looking for. Often they can't/won't say what that specific thing is.
  8. they only want to use what's in their rather limited parts box

There are probably other possibles too.

NT

Reply to
tabbypurr

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