Should it be the case that a Power Block is supplying power to a load with 100 uF or more of load capacitance, regulator manufacturers recommend connecting a reverse-biased high current diode (1N4004, etc.) across the regulated output and ground to protect the regulator from excess power dissipation.
For a 79xx-series negative regulator, you would connect the anode of this protection diode to the regulator's unregulated supply voltage, and its cathode to the - regulated voltage output of the Power Block.
For a 78xx-series positive regulator, you would connect the cathode of this protection diode to the regulator's unregulated supply voltage and its anode to the + regulated voltage output of the Power Block.
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