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Recent content by kevin998x

  1. K

    Please help me understand this circuit schematics (Door Alarm)

    How do the bare wire loop (door knob), Q1 and L1 form a high-frequency oscillator ? What are the purposes of C1 and C2 ? I cannot simulate correctly the bare wire loop. How do I simulate this circuit correctly ? Which open-source simulation software to use ? What happen to Q2 and Q3 when I...

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