anonymous
  • anonymous
need some help in half wave rectification circuit, ...
Physics
katieb
  • katieb
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katieb
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anonymous
  • anonymous
my set of question is like this, (question had specified it to be half-wave rectification) my expectation for the waveform from the output V1 is something like this: |dw:1340782227032:dw|
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anonymous
  • anonymous
but i got this waveform which looks like clipping to me o.o
1 Attachment
kropot72
  • kropot72
During the positive half cycle of the input voltage the cathode of the diode is positive with respect to the anode. Therefore the diode cannot conduct and the positive half cycle will appear at the output. Durin the negative half cycle of the input voltage the diode conducts, clamping the output at about -0.7 volt. The diode needs a forward voltage of about 0.7 volt to enable it to conduct.

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anonymous
  • anonymous
ouh so it means i will still get -0.7v if i measure across the diode, and flat for the negative region for measuring across the resistor?
kropot72
  • kropot72
Do you intend to use an oscilloscope to measure these voltages?
anonymous
  • anonymous
yea i used an oscilloscope to measure the output waveform.
kropot72
  • kropot72
You already have the voltage waveform across the diode. This waveform is -0.7 volts only during the negative half cycle of the input waveform. During the positive half cycle of the input voltage there is no conduction through the resistor and therefore no voltage across the resistor. The negative half cycles of the input voltage will be seen across the resistor.

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