1. Angakok Thoth

    Shunt voltage reference in feedback of integrator/opamp?

    I have a common inverting integrators made using opamp (capacitor in negative feedback, +input to GND). I would like to have all these integrators saturate at the same exact voltage. Adding a zener diode in parallel to the cap works, but zeners are 2% tolerance at best and temperature dependent...
  2. D

    Buffer a high Voltage

    Hello, In my design I need to buffer about 45V-48V and about 30V. For this purpose I want to use two Opamps in Unity Gain Configuration and chose to use 2 ADA4522 (since it has an input range of 0-55V and low a low offset voltage, see attached schematic). In the simulation the buffer circuit...
  3. E

    purpose of using two opamp together

    Hi i am referring one opamp based design (designed by friend of mine)where two op amps are used. one in inverting configuration and other one is in non-inverting configuration. i am bit confused what would be the purpose of using two op amps together? here is attached schematic. (Here R4 is...
  4. D

    5V PWM to 12V analog for lighting control. Arduino

    Hey, so I've got to build the circuit to output the signal specified below I've currently got an Arduino UNO and I have written the code to output this. however, I can only put out 5v from my Arduino and the circuit requires 12V and 10V output, being able to switch between12 and 0v incredibly...
  5. S

    Phase and Gain of transimpedence amplifier and effect of input impedance

    Hello, I am new to hardware design. I am designing measurement circuit for Impedance Spectroscopy of electrochemistry cell. I need to measure the current coming from electrodes which have range from few milliamperes to few nanoamperes. as literature suggested, the equivalent circuit for...
  6. S

    4-20mA Analog sensor to 0-3.3V Digital conversion

    I have a question about signal conversion since I am pretty new to this. I want to translate a 4-20mA signal into a 0-3.3V digital signal. I have done a lot of research and came up with a circuit, but i am unsure if this is possible / correct. My idea was to use a Transimpedance amplifier to...
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