1. ecaits

    Op amp used in cyclic voltammetry application

    In cyclic voltammetry application (as per circuit design given in image), the voltage difference between reference electrode (RE) and working electrode (WE) will be constant. As per REDOX process (Reduction & Oxidation), the current will flow between counter and working electrode. The circuit...
  2. MrsssSu

    Regulate voltage using op amp

    Hi readers, I am doing an Op Amp voltage regulation of voltage drop across load. As you can see from diagram, I have a fluctuating_Vin (0V to 50V) and I want the voltage drop at load (100 Ohms) to be the same (14V) at all times no matter whether input voltage is 20V or 30V or 50V? Note: I...
  3. MrsssSu

    Convert triangle wave to sine wave.

    Hi readers, the IN node has triangular wave converted from square wave pulse. This Op-Amp acts as integrator. However, when I attach the same integrator circuit to convert this triangular wave (IN) to sine wave, the Output (OUT) I got is still quite triangular and not quite a good sine wave...
  4. mva007

    Ripples in square wave output of LM7171 high speed OpAmp.

    I am trying to change the voltage level of a 10MHz clock signal. For this I am using LM7171 as a non-inverting summing amplifier, to DC shift the input signal, with some positive gain to reach the required voltage levels. The circuit has been soldered on a general purpose PCB and is operating at...
  5. E

    DC current sense using Opamp

    I want to measure a current consumption for DC fan. I am using OPA2197 opamp for the same. Following is the circuit diagram. i want to understand if this circuit missing anything?
  6. J

    Dimmer Circuit Simulation Problem

    Hi I am trying to make a dimmer circuit with proteus. But it is not working according to our calculations. I am very new both in proteus and also learning about OP-AMPs. So I am not understanding what's wrong with the schematics. Both the current and voltage is showing zero. Here is the...
  7. C

    Parallel Inverting Summing Amplifiers

    Hello Everyone, To add on to my newbness from yesterday, I have one other part of my design that I am not sure what's going on. I have some suspicions but thought you guys probably could spot it pretty quickly or at least probe at me to look at it differently. I have again attached a setup...
  8. C

    Microphone Filtering and Blocking

    Hello Everyone, I have a quick question about my audio section I am working on with a microphone. I have attached a screenshot of my setup. I am debugging the circuit in a couple of different areas and keep running across the same issue and I am not sure why....granted I am new at this stuff...
  9. busevaran

    Trying to control a motor speed with a PID circuit.

    Hi everyone! I'm Buse. I'm trying to control a motor speed for a personal project. You can find the schematic of the circuit I found on a book. This circuit works with only the PID parts contrcuted. My problem start when I add the other parts. For example, U1 opamp (top left) is supposed to...
  10. Ivan Badal

    compute gclosed as a function ??

    I have this inverter and do not know how to compute gain gclosed as a function of R1,R2,R3,R4,R5 and R6?? V out = closed * Vin. Circuit is in attach file!!
  11. T

    change the voltage range or lower the minimum voltage

    Hello everybody! I have a very basic question, surely I am using the DAC pin of an arduino due, which supplies a voltage between 0.55V and 3.3V, and I want it to supply a voltage between 0V and 5V. how can I do this? Is it possible at least that it supplies between 0V and 3.3V ?. that is, only...
  12. T

    How do I not pass current with 0V input? is it possible to change the input voltage range?

    Hello everybody! I have two questions. I have this circuit where I want to vary the input voltage (V1) between 0V and 5V to supply power to R2. Is it possible to make the circuit not supply a power (0W) to resistor R2 when my voltage V1 is 0V? When I do the simulation with 0V in V1 there is...
  13. Alex_Khan

    CMOS Two stage amplifier design for differential modulated signal.

    Hello everyone, I am designing LPF based differential demodulator(LPF_DDM) to retrieve differentially modulated signals, which are on-chip capacitive isolated [shown]. LPF_DDM includes a differential amplifier, LPF, and Schmitt trigger. I designed a two-stage opamp [specification below], as a...
  14. D

    Defining DFLOP output

    Hello, I would like to know how do I configure the DFLOP with + -15 V or whatever other voltage. I tried several things but it still has + -1V.
  15. khuranarahul

    Modify Duty cycle by 20 to 50 times

    Hello I have a pulse wave coming from the photo diode, with T(ON) = 50-60us, and total time period is approx 20ms. Since this is too short a period (T1) to be detectable I want to increase it to 5ms, keeping the total time period same, that means I want to multiply the duty cycle by 20 to 30...
  16. C

    Discrete low-noise preamp for opamp.

    I'm designing some audio-frequency instrumentation for my workbench and am using TL074s for most opamp requirements. One section requires microvolt measurements and noise is therefore an issue. It's often difficult comparing opamps on noise and other figures because they're often stated...
  17. O

    Basic electronics, configuration of OPAMP circuit on breadboard

    Hello everyone, I am an optical Engineer, with a little electrical experience, but it has been a long long time ago since i have made any kind of circuits my self, however that is the "case"here, so i am hoping some one would be willing to assist me. Normally i would just purchase the component...
  18. K

    HMC1501 op-amp power

    Hi, Kian here, I am new to this forum I hope this is the correct topic. Anyways, I am a ME with little exposure to the electronic & PCB design arena. That said, I am self taught and attempting to create a magnetic sensor board that will have a header with power input, GND and a signal output...
  19. G

    Two stage op-amp not working.

    Hello, I wanted to build a two stage amplifier, but in my case only first stage is amplifying the signal whereas the second stage is just acting as a buffer and not amplifying the output obtained from first stage. The input to first stage is 20mV and its output is -1.92V and the same thing is...
  20. Andrea666

    Exercises with voltage and power

    Can you tell me if my result results are correct, and if there are errors where are they? I used the symbol rms to indicate the root-mean-square, Avo is open-circuit voltage gain, Ap is the power gain, Rl is the load resistance. i stands for input, s for source and o per output. > 1) A sensor...