Capacitors

Dielectrics (2)

  • Mica, silvered mica, ceramic – low values, stable, suitable for HF
  • Hi-k ceramic – relatively large capacitance in small size, not suitable for radio frequencies (RF)
  • Very large capacitance require thin dielectrics formed chemically in electrolytic capacitors
  • Electrolytic capacitors are polarised; must avoid reverse polarity or overvoltage
  • Electrolyte can dry up over time causing failure