Voltage sensor signal stability circuit

Discussion in 'The Projects Forum' started by AustinCann, Feb 23, 2011.

  1. AustinCann

    Thread Starter New Member

    Jan 30, 2011
    Dear All,
    I am designing a voltage stablizier and had designed the circuit for it. However the voltage after LM324 IC is not a constant or stable value. It ramps up very slowly about 5 seconds and then sometimes go in the reverse direction. Ideally I would like it to ramp up ( if thats inevitable) quickly and stop on a steady value. Please see my circuit attached. The voltage sensor is the circuit beginning from 6v transformer
    Many thanks in advance
  2. wayneh


    Sep 9, 2010
    You need to explain a few things: What is the purpose of RV2? As drawn it's just putting a variable load on the bridge. What is "U5:A" connected to RV3? Does the resistance of the feedback loop change when RV3 is changed?

    And what is the purpose of your design for a "voltage stabilizer"? Is this any different than a voltage regulator? Are you just trying to detect the presence of power on the 6v transformer?
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    It seems you have the base and emitter of the optocouplers tied to the output jacks. The IRLEDs have no current limiting. What are they supposed to do?

    The lower LM324 with the CT input has no feedback.