I'm trying to build a stereo amplifier with two LM1875s. My plan is to use a 18-0-18V Transformer but my question is how much VA does the transformer need to be. How much current is required to drive two of these? I looked at the data sheet an saw that the supply current was 100mA and I thought to myself that can't be right, can it?
To quote Rod Elliott, from his ESP Project #72,
That 100mA is probably the no-signal quiescent current.The transformer rating is up to you. It should not be less than 150VA, and more than 300VA is unwarranted - the regulation improves with greater VA ratings, but the law of diminishing returns comes into play quite quickly.
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