I have created a voltage regulation circuit using op amp and feedback resistors, now I am trying to add a current limiter to the circuit. have read how to create this using two transistors and a resistor.
So far I know that if the current is to be limited at 10mA, and the transistor base emitter saturation voltage is 0.65V, then I choose a value for resistance using 0.65/0.01 = 65Ω.
at first this seems to work, however when I lower the load resistance, allowing more current to flow, the current is not limiting. I have read into it and followed the steps to create this circuit so I am now confused as to why this will not work the way it should.
If anybody can supply me with a reason as to why this is not doing its job that would be great !
-Con
So far I know that if the current is to be limited at 10mA, and the transistor base emitter saturation voltage is 0.65V, then I choose a value for resistance using 0.65/0.01 = 65Ω.
at first this seems to work, however when I lower the load resistance, allowing more current to flow, the current is not limiting. I have read into it and followed the steps to create this circuit so I am now confused as to why this will not work the way it should.
If anybody can supply me with a reason as to why this is not doing its job that would be great !
-Con