One advantage an electret has is its intrinsic charge, which eliminates the charging resistor, as shown on in Fig. 3. Either way, a fixed charge is maintained across the capacitor. The output voltage ...

When designing a microphone assembly the other day, I reached for an electret condenser microphone capsule without thinking. To be strictly accurate I ordered a pack of them, these small ...

West, now a professor of electrical and computer engineering at Johns Hopkins University, invented the electret microphone in the early 1960s. Today, West's invention accounts for 90 percent of ...