Advanced Qualification · A-004 Power supplies · A-004-004-007
The output capacitor, in a power supply filter used to provide power for an SSB or CW transmitter, will give better dynamic regulation if:
- A it is placed in series with other capacitors
- B the output capacitance is increased
- C the negative terminal of the electrolytic capacitor is connected to the positive the positive terminal to ground
- D a battery is placed in series with the output capacitor
Correct answer: B — the output capacitance is increased. From the official ISED question bank, verified word for word.
Why
Increasing the output capacitance gives the power supply a larger reservoir of stored energy, allowing it to maintain a steady voltage when the transmitter suddenly demands more current during speech peaks or Morse code dashes. The full explanation — and one for every question — is in Pro.
Practise this section
Power supplies: rectifiers, filtering, regulation, switching supplies and their failure modes.