1. S

    High side Current Sensing with opamps

    , I am trying to make overcurrent protection circuit using opamps with shunt resistor. But when I increase my main voltage my current must directly increase and comparator opamp compare the input voltage and Vref voltage if Vin greater than Vref than my mosfet must be triggered and close the...
  2. Alex_Khan

    Design review: Fully differential telescopic Operational amplifier.

    Hello, I used Behzad Razavi's book to design a fully differential telescopic op-amp [screenshot attached]. Then I follow the same steps to design my proposed opamp, but I am not getting the desired result. Can someone point out where I'm doing mistakes? For your reference, I have attached hand...
  3. H

    Multiple current sensors in parallel using opamps

    Hello, I'm making a workbench DC power supply monitor, with a current sensor for each voltage source, using LM324 opamps. The sensors work well alone, however they seem to measure not only the current on their source but also the currents on the others, so I can't measure the current on each...
  4. J

    Failed diode function generator

    Why would a diode function generator output a distorted waveform at high frequencies(>50kHz)? In theory and simulation, it should be fine, but when testing, the diode fails to perform properly at higher frequencies. Any ideas?
  5. MrsssSu

    Generate triangle wave with phase shift from square wave

    Hi all, I am trying to simulate the circuit above in LT Spice but the output is not the same . It can be found here . What mistake have I made :) ? I have attached my LT Spice zip in the folder below for easy amendment. Thank you
  6. A

    Output of OP-Amp circuits

    Could really use some help with this, thank you all :)
  7. Stas06

    DIY Microphone - THAT1510 or THAT 1512

    Dear all, As a reference to the context why I'm asking this question: I'm looking for the THAT1512 but it's hard to find and often the 20€ delivery is quite expensive for a 5€ part. Moreover, the THAT1512 seems to be out of stock in a lot of places until June 2022. I'm looking for an...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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?
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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!!
  18. 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...
  19. 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...
  20. 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...