Is connecting 3-pin audio jack to 4-pin slot safe?

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The state of the S-PIN diode can be switched by applying a for- ward bias voltage to realize the reconfigurable radiation slot of the antenna  Pin to Slot Clearance Measurement Objective 1: To measure the pin to slot clearance in the major axis direction

Ball lock pins and slot pins are machine parts that make it easy to connect parts, simply by inserting the specially designed pin part  17552 - Caliper Pin - With Bush Slot