In linear power supply circuits, the DC voltage output by the rectifier filter circuit is a key detection point. When there is no voltage or abnormal voltage at the output end, a multimeter can be used to detect whether the DC voltage output by the rectifier filter circuit is normal. The normal voltage at this point is a key condition for the normal output voltage of the subsequent stage. Under normal circumstances, placing the black lead of the multimeter on the circuit ground terminal and the red lead on the output terminal of the linear power circuit rectifier component should be able to measure a certain value of DC voltage; If there is no voltage output or if the output voltage is abnormal, the reversible signal process detects the front-end circuit. If the output voltage of the rectifier filter circuit is normal, but the linear power circuit has no output, it indicates that there are abnormal components in the voltage stabilizing circuit. Replacement, adjustment, or repair should be made based on the measured results to restore the performance of the circuit
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