Current supply circuit for supplying a circuit with an internal supply voltage on the basis of an external supply voltage with an bipolar transistor for realizing reverse-connect protection for the circuit to be supplied, a supply current flowing through the bipolar transistor's collector-emitter path, a regulating circuit connected to the bipolar transistor ensuring that the bipolar transistor is operated at the limit to saturation.

 
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> Power supply device and projection apparatus using the same

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