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Recent content by AakashDey

  1. A

    In accuracy in AC Voltage measurement

    Thanks for the valuable suggestions. What I exactly want know how accurately I can measure the AC voltage with the new Schematic (Clamp Diode method)? Because, previously for 230VAC, instead of 2.76V I was getting 1.9V at the ADC pin. I will definitely search the different methods of AC...
  2. A

    In accuracy in AC Voltage measurement

    Thanks. - We are going to use it from +40°C to +70°C. According to this conditions, Is my circuit will able to measure the AC voltage accurately (1-2%). -Check the ground (GND). I have connected the capacitor (0.22uF). I think, it is OK? - Is 1K resistor in series with the Ferrite bead (270K) is...
  3. A

    In accuracy in AC Voltage measurement

    I have design my circuit with Diode clamp. I have used BAT54S to clamp the voltage at 3.6V. But, the main concern is that we are not going to use the circuit in room temperature. So, is there any possibility of leakage current in the new circuit ? Also, I have used 1K resistor as shown in...
  4. A

    In accuracy in AC Voltage measurement

    Thanks for the reply. But what I need is over voltage protection. As you suggested, How a schottky diode and a resistor in series between clamp voltage and analog voltage without using the zener diode? I am not able to understand the schematic what you suggested.
  5. A

    In accuracy in AC Voltage measurement

    Thanks for the suggestion. I have measured the voltage after removing the Z-diode. Now, I am getting the accurate voltage after the divider. Actually, I have used the zener diode to avoid any over voltage to the Controller. So, as the leakage current of the Z-diode is creating problem, so what...
  6. A

    In accuracy in AC Voltage measurement

    I want to measure the AC voltage through controller (ESP32). So, I have designed a schematic which is attached. As per as my calculation, for 230VAC voltage. the voltage after the divider should be 2.76V. But, practically I am getting 1.9V. Similarly, with 110VAC I am getting 1.2V in practical...
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