Editing Basic Circuit Building Blocks

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Use this circuit when you have a signal of high impedance ( can supply only a little current ) that you want to connect to another circuit that draws a significant current ( up to about 10 ma for the typical op amp. ).  For example if you wish to measure the output of a voltage divider with a 0 to 1 ma meter a unity gain buffer might be just what you need.  This circuit is also know as a voltage follower.
 
Use this circuit when you have a signal of high impedance ( can supply only a little current ) that you want to connect to another circuit that draws a significant current ( up to about 10 ma for the typical op amp. ).  For example if you wish to measure the output of a voltage divider with a 0 to 1 ma meter a unity gain buffer might be just what you need.  This circuit is also know as a voltage follower.
  
The unity gain buffer has an output voltage just the same as the input voltage.  The advantage is that the input circuit does not “feel” the output.  That is the input acts pretty much like a very large resistor ( many mega ohms or more ) connected to ground, and the output supplies whatever current ( up to about 10 ma ) is necessary to maintain the output voltage.  Here is the circuit:
+
The unity gain buffer has an output voltage just the same as the input voltage.  The advantage is that the input circuit does not “feel” the output.  That is the input acts pretty much like a very large resistor ( many mega ohms or more ) connected to ground, and the output supply's whatever current ( up to about 10 ma ) is necessary to maintain the output voltage.  Here is the circuit:
  
 
Circuit:
 
Circuit:

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