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whats worng with this circut
whats worng with this circut
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Old 23rd June 2013, 09:26 AM   #11
sharon1 is offline sharon1
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OK thanks!!!
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Old 23rd June 2013, 09:28 AM   #12
Mooly is offline Mooly  United Kingdom
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whats worng with this circut
OK

Keep trying to see where your going wrong. Make sure your grounds are correct and try increasing the voltages a bit. I used 15 and 7.5 volts.
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Old 23rd June 2013, 09:33 AM   #13
mjf is offline mjf  Austria
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hello.
perhaps this works..........
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Old 23rd June 2013, 10:11 AM   #14
mjf is offline mjf  Austria
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Quote:
Originally Posted by sharon1 View Post
i quit
capacitors........
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Old 23rd June 2013, 05:13 PM   #15
Ken Newton is offline Ken Newton  United States
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sharon1:

To see what is wrong with your original circuit, you must look at it first in strictly D.C. terms, and then again in strictly A.C. terms. To do that, simply remove all capacitors from the circuit, leaving their positions open (for the D.C. analysis), and determine whether the output would have a stable quiescent voltage (usually, but not necessarily, at the mid-supply voltage). Then, place shorting wires across the capacitor positions (for the A.C. analysis), and determine whether the applied A.C. signal would produce an output voltage swing within the amplitude limits of the op-amp, given the supply voltage and the D.C. quiescent point.

Post #14, by mjf, shows a circuit that will work. Among the things which will become evident, is that utilizing a bipolar power supply can remove the need for any of the coupling capacitors.

Last edited by Ken Newton; 23rd June 2013 at 05:40 PM.
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