Booster

162

02:34:19

Current has to flow through the demagnetised circuit in order to magnetise it. But once magnetised, it opens the circuit which shouldn't allow current to flow. Could someone explain why it works?

published 10 years ago

GingerKing

10 years ago

The split second events cause the NPN to charge the capacitor. The inductor then has sufficient current flowing through / large enough magnetic field to cause the relay switch to flip. The cap discharges until the inductor doesn't have current flowing through it. Repeat.

pcgaldo

10 years ago

It could be what you are searching for: http://everycircuit.com/circuit/4753050894860288

stanislav_maslovski

10 years ago

Usually, a relay has enough mechanical delay so that this circuit will work even without the capacitor. You can also get rid of the transistor if you let the relay to switch its own coil directly. What you get in this case is called "zummer". Simple electric doorbells work the same way.

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