Multisim and Ultiboard

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What's wrong with this schemetic?

I tried this test in Multisim:



why the output is not near 2v(the input voltage)?

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Hi MianQi,



Here are the problems in your circuit:


  • You have to interchange Vcc and Vee. For LM324, the positive power supply input (V+) is pin 4 not pin 11, the ground or negative power supply input (GND/V-) is pin 11 not pin 4. You should not always assume that for ICs the positive power supply terminal is at the top while the ground or negative power supply terminal is at the bottom. This post may also be helpful to you: Re: Change + - of op amp.
  • Reduce your power supply voltages. The LM324 can be powered from 3 V to 32 V or ±1.5 V to ±16 V. The absolute maximum rating is 32 V or ±16 V. Use up to ±15 V so there is a margin of at least ±1 V.
  • When the input voltage  has a peak value of 2 V don't expect the output to have a peak value near 2 V. Your circuit is a noninverting amplifier and the voltage gain is not 1 but 2 (1 + 10 kΩ / 10 kΩ).

Verify the information that I presented above from the datasheet. It's inconvenient for me to open the necessary document(s) so I can't do the verification for you.



Best regards,

G. Goodwin


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