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Thread: Thyristor or Transistor?

  1. #1 Thyristor or Transistor? 
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    What would you use for the following description (thyristor or transistor)?

    You need to make a circuit that is similar to that of an alarm. The scenario is that a family has just gone on vacation and have turned on their alarm. Their alarm works so that when a motion sensor is activated it causes a loud siren (constant barking) to go off; the purpose is to try and scare away robbers. My question is what would you use to hook up to the input device (the motion sensor), to turn on the output device (the barking siren), a thyristor or a transistor?


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  3. #2  
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    Hello,

    That depends on the power and voltage of your sounder. I think it is a sounder which works with a continuous voltage (5 Vcc or 24 Vcc) because it has a security function.

    To amplified the current signal, there are two cases :

    1) If it is a small power sounder and there is not a big length of cable between the sounder and your anti-burglary unit. You can use a transistor inside your unit.

    2) If the sounder requires a current which not support the technology of transistor used. It is preferable to use the thyristor technology more suitable to amplified the current more than a transistor. Moreover, a thyristor is composed of two transistors which duplicate the current amplification.

    Nota : If you use an alternative current to feed your sounder and your sounder works in continuous current. It is more preferable to transform and rectified your voltage from a supply inside your anti-burglary unit.


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  4. #3  
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    Alright that makes sense thanks for the help.
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