Electronics & Technology
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A blocking oscillator is a type of electronic oscillator that generates a
periodic waveform by alternately charging and discharging a capacitor through an
inductor. The oscillator circuit is called a "blocking" oscillator because it is
designed to generate a pulse waveform that blocks or isolates the DC voltage
input to the output.
The basic design of a blocking oscillator consists of an inductor, a
capacitor, and a transistor. When the transistor is turned on, the capacitor
charges through the inductor until the voltage across the capacitor reaches a
certain threshold, at which point the transistor turns off and the capacitor
discharges through the inductor. This cycle repeats, generating a pulse waveform
at the output.
Blocking oscillators are commonly used in various electronic circuits, such
as voltage converters, voltage multipliers, and timing circuits. In voltage
converter applications, the output of the blocking oscillator is connected to a
transformer, which steps up or steps down the voltage. In voltage multiplier
applications, multiple stages of the blocking oscillator are cascaded to
generate higher voltages. In timing circuits, the oscillator is used to generate
a precise frequency for clock signals.
One of the advantages of the blocking oscillator is its simplicity and low
cost, as it requires only a few components to generate a waveform. It can also
operate at high frequencies and can provide a high voltage output with
relatively low power input. However, the blocking oscillator has a disadvantage
of generating high levels of electromagnetic interference (EMI), due to the
sharp edges of the pulse waveform.
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