Ilovemaths96
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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?

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uberteknik
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(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?

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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.
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uberteknik
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(Original post by Ilovemaths96)

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