Thursday, December 1, 2016

Circuit Schematic Diagram YL 38 Comparator Module using L393 IC

ElcoHow. - This is one the circuit schematic diagram of application of Op-Amp IC for comparator section. One of Op-Amp application is for comparing voltage input like using L393 IC look like in Figure 1 below.

In this time, we will give you global description about this YL 38 Comparator Module using L393 IC circuit schematic beside we give you circuit schematic diagram and component parts used in this circuit.

Circuit Schematic Diagram

Component Parts

  1. Capacitor
  2. Resistor
  3. Variable resistor
  4. LM393 IC
  5. LEDs


This is circuit schematic diagram of YL 38 Comparator Module using L393 IC that can help you to build comparator using L393 IC for many application. The main component in this circuit is L393 IC. 

According Circuitstoday site that also published this circuit describe that Output voltage of the sensing probe is connected to the inverting input of the opamp. When the moisture level is high more current passes through the sensing probe and so the voltage at the inverting pin will be higher than the reference. The reference can be set using the trimpot R2. At this condition output of the opamp goes low and sinks the LED D1 to make it glow. When the moisture is lower than the set point, the opposite happens. So in simple words, a LOW output of the opamp indicates a high moisture and a HIGH output of the opamp indicates a low moisture. Output of the opamp is marked as pin D0 on the sensor YL 38 module. This pin is connected to the microcontroller for further processing. LED D2 is just a power ON indicator. Capacitors C1 and C2 are noise filters.

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