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Use this circuit when you want to convert AC to DC at significant current in order to provide DC power to another circuit component, it can be also used as a very low precision "precision rectifier".  Basically similar circuits are sometimes used as demodulators for AM signals.
 
Use this circuit when you want to convert AC to DC at significant current in order to provide DC power to another circuit component, it can be also used as a very low precision "precision rectifier".  Basically similar circuits are sometimes used as demodulators for AM signals.
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Circuit:
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[[Image:pds.png | Pull Down and Switch ]]
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Where
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*R_PULLDOWN resistor which normally keeps the output low ( ground ).
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Discussion:
 
Discussion:
  
 
There are many variations of this circuit, sometimes in combination with center tapped transformers, sometimes with multiple diodes ( as in bridge circuits ).
 
There are many variations of this circuit, sometimes in combination with center tapped transformers, sometimes with multiple diodes ( as in bridge circuits ).
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Links:
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Use this circuit when you want to know the peak voltage of an AC of time varying DC voltage of just its absolute value.  It typically differes from a power rectifier in that the circuit needs
 
Use this circuit when you want to know the peak voltage of an AC of time varying DC voltage of just its absolute value.  It typically differes from a power rectifier in that the circuit needs
 
its own source of power, it does not pass thru the power of the input voltage, it also differes in that the typical voltage drop of the power diode ( in the range of .5 to 2 volts ) is largely eliminated. This is a signal processing circuit.
 
its own source of power, it does not pass thru the power of the input voltage, it also differes in that the typical voltage drop of the power diode ( in the range of .5 to 2 volts ) is largely eliminated. This is a signal processing circuit.
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Circuit:
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[[Image:pds.png | Pull Down and Switch ]]
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Where
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*R_PULLDOWN resistor which normally keeps the output low ( ground ).
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Discussion:
 
Discussion:
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  * [http://www.ti.com/lit/an/sboa068/sboa068.pdf PRECISION ABSOLUTE VALUE CIRCUITS By David Jones (520) 746-7696, and Mark Stitt]
 
  * [http://www.ti.com/lit/an/sboa068/sboa068.pdf PRECISION ABSOLUTE VALUE CIRCUITS By David Jones (520) 746-7696, and Mark Stitt]
 
  * [http://i.stack.imgur.com/kUIO3.jpg Images]
 
  * [http://i.stack.imgur.com/kUIO3.jpg Images]
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