Capture note A - 440Hz voice or instrument and push into cap or caps.

152

02:48:30

Designed to take a frequency of 440Hz (commonly what note 'A' is tuned to on an instrument) at 10mV amplitude (an amplitude in the range of a human normal speaking voice when near the speaker)

Top circuit used DC source to determine values for RLC

Bottom circuit arranges RLC in series. Diode going to cap increases in voltage gradually when 'A' sound is held for a period then stops. Note back EMF mostly starts to fill capturing cap when it's positive (orange spikes in the positive area), so every stop via switch will not charge cap. 

Some sort of cone/diaphragm would replace signal generator on bottom circuit to capture 440Hz sound. 

  Bottom circuit can be configured like my "trickle charge" circuit to push higher voltages to progressively larger caps. 

  Note: For more dramatic effect, remove 20mOhm resistor from bottom circuit. If you do this, make sure your capture cap below diode has a high V rating.

published 2 years ago

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