HH_1_29 - then it takes over without interruption. Make a...

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Problem HH 1.29 A useful application of diodes is to pass the higher of two voltages without affecting the lower. An example of this is battery backup, a method of keeping something running (e.g. a precision electronic clock) that must not stop when there is a power failure. The figure below indicates a circuit that does the job. The battery does nothing until the power fails;
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Unformatted text preview: then it takes over without interruption. Make a simple modification to the circuit so that the battery is charged by the dc supply (when power is on, of course) at a current of 10 mA (such a circuit is necessary to maintain the batterys charge)....
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