I've noticed that some advocate using separate transformers for each channel of a power amplifier. I presume the reason is better supply decoupling.
I'm unconvinced whether this is a better method of supply decoupling than using a single transformer an LC or RC filter for each channel.
I'm considering LC coupling (with a damping resistor) for each channel. In practice, is there any benefit of LC coupling vs RC coupling? One obvious benefit of LC is less power dissipation and better ripple attenuation. However, we're not making linear amplifiers due to their power efficiency.
I'm unconvinced whether this is a better method of supply decoupling than using a single transformer an LC or RC filter for each channel.
I'm considering LC coupling (with a damping resistor) for each channel. In practice, is there any benefit of LC coupling vs RC coupling? One obvious benefit of LC is less power dissipation and better ripple attenuation. However, we're not making linear amplifiers due to their power efficiency.
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Calculate the current rating you'd want, for an inductor in the power supply of a class AB power amp (or Class A if you prefer) which delivers W watts RMS per channel, into 8 ohm loads.
Calculate the minimum inductance you'd want, for that inductor. I predict you'll say, 0.7 millihenries or greater.
Now look up the weight, size, price, and availability of inductors which meet your specifications for current rating and inductance.
Do the same exercise for the resistor(s) in an RC filter. Which do you prefer?
Calculate the minimum inductance you'd want, for that inductor. I predict you'll say, 0.7 millihenries or greater.
Now look up the weight, size, price, and availability of inductors which meet your specifications for current rating and inductance.
Do the same exercise for the resistor(s) in an RC filter. Which do you prefer?