Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    3
    ReputationRep:
    What is the purpose of capacitors in audio amplifier circuits with mosfets? I know they allow AC, is it something to do with the the bias being dc?

    Thanks
    • Study Helper
    Offline

    21
    ReputationRep:
    Study Helper
    (Original post by Ilovemaths96)
    What is the purpose of capacitors in audio amplifier circuits with mosfets? I know they allow AC, is it something to do with the the bias being dc?

    Thanks
    Short answer:

    Depends on where they are placed in the amplifier. Without viewing the circuit schematic, the answer can only be very general but will be a combination of:

    a) d.c. blocking;

    b) a.c. coupling;

    c) frequency response shaping. (analogue filtering);

    d) Phase shifting to prevent oscillation where feedback is used or parasitic oscillations local to the semiconductors.

    e) Impedance matching for maximum power transfer;

    f) a.c. power supply reservoir and a.c. ripple smoothing.

    g) power supply decoupling to prevent inadvertent feedback paths.
    • Study Helper
    Offline

    21
    ReputationRep:
    Study Helper
    (Original post by Ilovemaths96)

    x
    Are you OK with the answer provided?
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Write a reply...
    Reply
    Hide
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.