상황
A user needs a variable low-frequency pulse train to pulse an electromagnetic lock for access control or vibration testing, with safe inductive load switching.
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01
Use a 555 timer in astable mode to generate adjustable 0-300 Hz pulses from standard DC supply.
02
Wire the relay-coil load with a flyback diode across it to suppress inductive kickback.
03
Include supply decoupling and control-voltage filtering for stable timing.
Reuse this circuit when a simple adjustable square-wave oscillator must drive a low-current inductive actuator or electromagnetic lock in prototypes, test rigs, or educational labs.