Clamper diode

Discussion in 'General Electronics Chat' started by DexterMccoy, Mar 26, 2014.

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  1. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    I'm not sure why they have a Positive Clamper Circuit which is C11, CR19, R35 to set up a DC offset voltage for Q1

    Instead of using biasing resistors they used a Positive clamper circuit, but why? for what reason?
     
  2. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    Here is the schematic


    The clamper does not restrict the peak-to-peak excursion of the signal, it moves the whole signal up or down so as to place the peaks at the reference level. A diode clamp (a simple, common type) consists of a diode, which conducts electric current in only one direction and prevents the signal exceeding the reference value; and a capacitor which provides a DC offset from the stored charge.

    The capacitor forms a time constant with the resistor load which determines the range of frequencies over which the clamper will be effective.
    clamping circuits will fix the voltage lower limit (or upper limit, in the case of negative clampers) to 0 Volts. These circuits clamp a peak of a waveform to a specific DC level compared with a capacitively coupled signal which swings about its average DC level.

    it offsets the input signal so that all of the waveform is greater than 0 V
     
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  3. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    I don't get how an AC signal on the input that goes to the Capacitor will charge it up and will STORE DC voltage from an AC input signal

    This is what creates the DC offset voltage

    The capacitor stores a DC voltage? from an AC input signal?
     
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