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Ideas for a HP41c module

tall_keys_-_5Some of our readers know that the other of my passions is audio. And more and more the DIY variety - so there are many calculations there. 

I would be very thankful if you could provide me with formulae or programs for audio design, or direct me to sites that have them. Some of the items I'd like to cover and integrate in the audio module:

  • Thiele/small parameter calculation for loudspeakers
  • Sound pressure -loudspeaker efficiency - amplifier power relations
  • Filter component calculation
  • Room resonance frequencies
  • Amplifier feedback component calculation
  • Triode model for a local operating point.

You get the point. Please contact us at with equations that you may want to have included in the module! This should come accompanied with some manual too.



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