Sensor Overload (Overload Detector, Overload Protector)
Techniques to avoid excessive currents due to excess load (overload), one of them by installing a resistor in series with the load, but eg resistor value is too large it will affect the performance of existing electronics systems. Sensor circuit Overload (Overload Detector) can be used as a solution, because the sensor circuit Overload (Overload Detector) is working to mengukiur kelbihan flow caused overload or overload. Sensor circuit Overload (Overload Detector) was developed by Op-Amp LF351, Schottky diodes and resistors as sensors mounted on the current path to the control.
Sensor circuit Overload (Overload Detector, Overload Protector)
In the sensor circuit Overload (Overload Detector) mounted schotty diode serves to make a difference in input voltage inverting and non-inverting Op-Amp. Voltage Drop Down D1 (Schottky diode) will be 0.2 to 0.3 V. This value can be affected by R1, the greater the value of R1, the smaller the voltage drop down diode. Inverting input OpAmp is connected to positive supply voltage through the resistor Rs. Thus, the voltage level at the Op-Amp output will be equal to the negative supply voltage, such as -5 V.
At the time of current flowing in resistor Rs increases, the voltage at the inverting Op-Amp input decreases. At the same time the voltage drop down Rs = (Is × Rs) to be slightly larger than the voltage drop down D1, so that the output of the OpAmp will switch to a positive supply voltage level. An indicator light or a relay can be connected to the output of Op-Amp as an indicator of excessive current or a circuit breaker in the event of excessive current is. The maximum supply voltage for the OpAmp is ± 15 V. Hopefully useful and help overcome the problem of overload in electronic circuits.