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What differentiates good audio xmfrs from bad ones?

it is about current,

the so called magnetizing current that flows even with no load.

the additional current that flows in the primary when the secondary is load ed IS CANCELED by the current in the secondary.

So it is all about the current that flows only due to the primary inductanc e and not due to the load current.

Yours is a common mis-conception. I'm glad to help you learn.

m

TION".

oportion.

bit cos it is coming form the mains supply.

ltage applied to the primary drops when a load is applied to the secondary.

high, triodes are somewhat better.

turation distortion when loaded compared to unloaded.

Reply to
makolber
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NO, that's exactly backwards: a 'free' transformer with negligible secondary current DOES near-saturate. The primary current and secondary current are in the opposite direction, so load (secondary) current CANCELS the magnetization caused by the drive (primary) current.

A lot of secondary current (high load current) removes the risk of saturation.

Reply to
whit3rd

** While adding load current does not directly alter the magnetising current in the primary, it does reduce the effective AC supply voltage seen by the primary.

This is due simply to the resistance of the primary winding - current flow produces a voltage drop which must be subtracted from the external supply voltage to accurately model what is going on.

Eg, say the primary current due to load is 1 amp and the winding has 5 ohms resistance - then the effective voltage is 5 volts LESS than the AC supply.

.... Phil

.... Phil

Reply to
Phil Allison

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