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buck boost circuit

Discussion in 'General Electronics Discussion' started by nghiep, Mar 27, 2022.

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  1. nghiep


    Mar 26, 2022
    Hi, I a beginner . i found an image of circuit diagram from this link :

    I dont understand the part around U1 - 7805? what the purpose of U1-7805 in this case ?
    Furthermore, in the diagram there is 5 V source ,where is the 5 V source come from ? The author only say change 20 to 5V by using op amp but in here the 5V source not come from op amp.

    Could you guy explain these for me ?

    Attached Files:

  2. Martaine2005


    May 12, 2015
    The 7805 is a 5 volt regulator.
    The 12V is the input voltage to the 7805 voltage regulator.
    That is where the 5V comes from.

    Arouse1973 likes this.
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