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A capacitor is placed across a coin cell in a pulsed design to

  • A.increase the total quantity of energy the cell is able to deliver
  • B.reduce the cell's self-discharge
  • C.filter the noise the radio generates
  • D.supply the pulse current so the cell's resistance does not matter

Answer: D

The capacitor is recharged slowly between pulses through the cell's resistance and delivers the burst at low impedance, so the terminal voltage holds up. Sizing it from the pulse charge and the permissible droop is a short calculation worth doing.

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