Time Delay circuit triggered with a NPN sensor

Discussion in 'Homework Help' started by kbulita, May 3, 2011.

  1. kbulita

    Thread Starter New Member

    May 3, 2011
    1
    0
    Hi everybody! Could you please be so kind to help me find a simple circuit solution for a time delay circuit which a signal is input (by means of a NPN sensor) and then a signal will be output after 3 - 20 sec (variable).

    Requirments:
    Vin: 12V
    Vout:12V
    I can use simple components such as: resistors, capacitors, transistors and diodes only. Is it possible to use a 555 IC?

    Any help will be much appreciated. Many thanks in advance.

    Regards,
    Luis
     
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