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Blocking oscillator

Discussion in 'General Electronics Discussion' started by Noah, Jan 13, 2017.

  1. Noah

    Noah

    3
    0
    Jul 19, 2016
    Hi
    please I'm trying to understand the working of the blocking oscillator. It's being said that C1 in the diagram is discharged by R1. I can't trace the path of connection between the two because I can see one end of the resistor still connected to vcc.
     

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  2. Harald Kapp

    Harald Kapp Moderator Moderator

    8,830
    1,741
    Nov 17, 2011
    It's rather well described e.g. here.

    discharge can be to Vcc, too. Note the little dots at the transformer? Those are not dead flys :), they indicate the start of the winding.This means that they have the same polarity when the transformer is operating. The dot on the right side is towards Vcc, the dot on the left side is towards C1. Therefore when a current flows through the transformer's right side from Vcc towards the transistor, the connection to C1 will be positive, too.
    Connecting both sides of a capacitor to the same (or a similar) potential will discharge the capacitor.
     
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