Exp_9_OP_Amps_v08 - Op Amps II, Page 1 Op Amps II Op-amp...

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Op Amps II, Page 1 Op Amps II Op-amp relaxation oscillator Questions indicated by an asterisk (*) should be answered before coming to lab. Build the relaxation oscillator shown in Figure 1 above. The output should be a square wave with a frequency about 1/(2RC). Resistor R 1 can be any value between 1K and 1 M. Resistor R is one side of a potentiometer. Examine the voltages at (+) and (-) inputs and at the output and follow the action of the switching. It is useful to display v + and v - simultaneously on the same scale to illustrate that the switching occurs at the crossover of v + and v - . *Show that the transfer function for the low pass resonant filter, shown in Figure 2, is given by: H ( " ) = 1 1 # x + x (1 + j "$ ) 3 Figure 1: Relaxation Oscillator Figure 2: Low-pass Resonant Filter
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Op Amps II, Page 2 where τ = RC and x is the ratio of R 1 to the total pot resistance R 1 + R 2 . Here R 1 is the part of the pot resistance between the output and the inverting input of the first opamp
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Exp_9_OP_Amps_v08 - Op Amps II, Page 1 Op Amps II Op-amp...

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