op amp question

  1. StijnC

    Single op amp PWM generator

    Hello, I have to design a single op amp circuit that has only +15v, -15v and GND as input and outputs a symmetrical PWM signal (+V and -V) with adjustable frequency and duty cycle. I have something that works partly but not completely, I can adjust the duty cycle from ±60% to ±100% but af that...
  2. X

    Im stuck on my electric curcuit homework could u guys help me

    Im stuck on my electric curcuit homework could u guys help me
  3. B

    Hartley Oscillator using an Opamp

    I was trying to derive a model for Opamp Hartley oscillator. I used a R at mouth of opam to increase the output impedance. So i tried including it in calculation. As the opamp is modeled as output voltage of Avi so using a R in series with it with help me to reconfigure the circuit changing the...
  4. M

    OP amp question. Calculate the gain vi/vo.

    Hi I'm currently stuck on current question. Consider the following OP amp circuit in . Obtain the gain vo/vi of the amplifier. What I can see is I can find the voltage on positive and negative pin of top OP amp, which is 30/50*vi (because positive pin of top OP amp is in parallel with 30...
Top