Circuits

Power Supplies (3)

  • Capacitor supplies current to top up voltage, smoothing output (blue) from full-wave input (green)
  • R1 is bleeder resistance to discharge the cap for safety reasons when supply is switched off; it also provides a minimum load, improving stability
  • Large current into capacitor at switch on;  pulses of current into capacitor each half cycle (red).  Diode rating must take account of this