DC 12V 4-Channel LM393 Voltage Comparator Relay Module

 

LM393 Voltage Comparator Relay Module is a product that turns the relay on or off depending on the input voltage. There are 3 different operating modes. In this way, you can turn the relay on and off when the voltage value you enter is higher or lower than your reference value.

 

The reference voltage value can be changed with the help of the trimpot on the product. To switch between product modes, the positions of the jumpers behind the trimpots must be changed or removed. The reference voltage of the module is adjusted by turning the trimpot. You can measure the reference voltage value you set with a meter. You can read the reference value when you hold the black cable of the meter to the minus of the supply terminal and the red cable to the terminal labeled IN-.

 

The 12V mentioned in the product name refers to the supply voltage of the circuit. You can switch the voltage value you want with the relays on the product.

 

The jumper for function 1 is installed on the right. It is completely removed for function 2. For Function 3, it is mounted on the left.

 

 

Function 1:   Input the voltage to compare with the reference voltage set on the module (the reference voltage can be adjusted by the adjustable potentiometer on the module). The relay closes when the input voltage is greater than the set reference voltage; When the input voltage is less than or equal to the reference voltage, the module does not move. Comparison voltage is entered from the IN+ terminal.