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From my experience, these diodes could serve two functions. First, they can protect the circuitry from the misapplication of the power. If someone were to connect a minus polarity to the power input line, the diodes could blow an upstream fuse or protection device. More likely, however, is that they would clip the output signal to be equal to or less than the rail voltage. It doesn't seem likely that that would occur, but if there is any inductance in the circuit, it might be possible for the output to exceed the rail voltage. The consequences of this are completely unknown as the rest of the circuit has not been shown. Since the cost of diodes is small, it is probably a good idea to include them rather than leave them out just to save a little space or money.
Mountain Man
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