4/11/2023 0 Comments Diy lm3886 amplifierIf we get the full 68W out and we are using a 70Vdc supply, then the DC power is 70/68 = 1.03A. This is not necessarily true for hifi loads. Anything from 42vct to 52Vct is actually just fine because the available power drops very little and it's not particularly audible.Īs to current rating: It makes sense for a music amplifier to use a transformer that can supply the full power continuously. You'll want + and - voltages, so you need no more than 52Vct, or 26+26vac secondaries. To get 72V dc, you have to use a fill wave bridge, and that causes a 1.4V loss (two diodes) so the peak AC feeding the bridge is 73.4V, and the RMS value of that peak voltage is 73.4/1.414 = 51.9Vac. So we want to run most of the time at 88% of 84V or 73.92V or less. Power line surges of 12% are not uncommon. The chip dies a fiery death at 84.00000V between the V+ and V- pins, so we don't want to go there.
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