circuit simulation Interview Questions


 

Interview Question in circuit simulation

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Generate TTL signal with Multisim FUnction generator

Hi friends,
currently i need a TTL input for my circuit simulation. I'm using Multisim 9 to draw the circuit and do the simulation. However, for my input TTL source, i am going to use the function generator with square wave. by the way, what is the setting for the function generator? frequency?duty cycle?amplitude?offset?rise /fall time? thanks for helping hand

Free eletrical circuit simulation software

Anyone know where i can get a free eltrical circuit simulator - need op. amp, trasistors , resistors diodes ... and all the rest

Cheers
Blair

How do you choose an op-amp for this circuit

Need a little help picking an op-amp that will work in my circuit. Here is a link to an image of the circuit I have created http://i162.photobucket.com/albums/t259/...

As you can see I am trying to create a variable voltage power supply. The idea is to control the voltage with the potentiometer. I have ~5.471V coming into the input of my op amp. I want to get roughly 15V at the output (which is how I chose the 5.6K and 10K resistor values). Everything works fine in my circuit simulation program if I use an "ideal" op amp (I get a max voltage of ~15V at the 1.8K load). However if I switch the op-amp to say an LF411C the max voltage at the load drops to ~12.18V. I am afraid I do not know enough to properly choose the correct op-amp. I have incorporated some multi-meters into the circuit so you can see the various currents and voltages. If more information is required please let me know. Otherwise which op-amp should I choose?

Thanks

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