The difference between the two circuits

hi friends,
can anyone please explain me the difference between the two circuits as shown in figure 1 & figure 2.

Thanks..

The circuit in figure 1 is a unity gain buffer, ie it has a gain of 1.

The circuit in figure 2 will not work as drawn. It needs two resistors, one between the output and inverting (-) input of the LM324, the other between the circuit input and the inverting input of the LM324.

THe circuits are also drawn unconventionally with the +ve supply at the bottom of the drawing and the -ve supply at the top. they should be the other way up.

In the second ckt you have simply shorted the input and the output hence bypassing the circuit.

electronist said:

In the second ckt you have simply shorted the input and the output hence bypassing the circuit.

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Except the output is low impedance, so it will short the signal to ground!.