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Question
What can be the cause and what are the possible countermeasures if the pushbuttons M2BJ-B[][] AC/DC shared buzzer does not sound?
Answer
There is a smoothing capacitor in the internal circuit and it is possible that inrush current has caused the switching power supply to overload, resulting in no outputs.
1.
If there is a switching power supply overload, it is possible to reduce the inrush current by connecting an external limiting resistor (20 to 30 Ω) in series.
2.
The M2BJ-B[][]-D for DC only has no inrush current.
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