Power Supply for LM1875

[Sh00pus]

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?

 

[sofaspud]

To quote Rod Elliott, from his ESP Project #72,

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.

That 100mA is probably the no-signal quiescent current.

 

[Sh00pus]

Wow thanks! That's a great article, I'm going read up on that.