# Multisim and Ultiboard

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## Need some help please with my circuit

sinusoidal signal with peak-to-peak amplitude 0.2V, frequency 5kHz and offset 0.05V, and two outputs:

A sinusoidal signal at the same frequency as the input, peak-to-peak amplitude 2.2V and offset 0.55V.
A sinusoidal signal at the same frequency as the output, peak-to-peak amplitude 1.14V, and no offset

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## Re: Need some help please with my circuit

Hello,

your supplies should be VDC sources instead of sine waves. As they are, the opamp is supplied with 5V, 5kHz sine waves. Replace V1 and V2 with 5V batteries.

Also, your non-inverting amp gain is (1+47/10)=5.7. With an 5V input signal this will saturate your opamp and you will not see the correct output. Try with 100mV input signal in V3 with some offset if you want.

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## Re: Need some help please with my circuit

Thank you very much. Could you guide on these VDC source. I am not an electronic student. I am just trying to learn some basic about circuits.

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## Re: Need some help please with my circuit

You can find the VDC source (battery) in the Sources category (DC Voltage VCC). This provides a continuous voltage as required by the amplifier supplies. The polarities you used are correct, the opamp has symmetrical supplies referenced to GND.

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## Re: Need some help please with my circuit

Thank you very much once again. For simulation do i need to add values or it will do it automatically?

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## Re: Need some help please with my circuit

Yes, you need to specify the voltages. For an ideal opamp model these can be chosen. For real opamps the supplies must comply to the device datasheet.

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