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Reference voltage
The reference voltage of the module is obtained by dividing the positive pole of the input power supply through a precision resistor. The positive voltage of the input power supply determines the range of the reference voltage. For example: the positive input of the power supply is 12V, then the adjustable range of the reference voltage is 0~12V.
Parameter
Module usage: industrial control equipment, instrumentation, experimental test, automotive circuit modification, etc.
Working voltage: DC5V \ DC12V \ DC24V
Working current: DC5V-50ma \ DC12V-35ma \ DC24V-25ma
Module appearance: 45x30x18mm (length x width x height)
Pin description
Pin description
- [1] Inverting input terminal of voltage comparator (-)
- [2] The negative pole is connected to pin 5
- [3] The positive phase input terminal of the voltage comparator (+)
- [4] Power input positive
- [5] Power input negative
- [6] Relay normally open pin
- [7] Relay common pin.
- [8] Relay normally closed foot
- [9] Relay status indicator, the light is on when the relay is closed (7-6 is on), and the light is off when the relay is off (7-6 is off).
- [10] Jump cap setting function 1, function 2, function 3 jump cap setting method, as shown in the figure
- [11] Adjustable potentiometer, used to adjust the reference voltage value
Function one description
Function 1
Input a voltage to be compared with the reference voltage set on the module (the reference voltage can be set by the adjustable potentiometer on the module) to compare. When the input voltage is greater than the set reference voltage, the relay is closed; when the input voltage is less than or equal to the reference voltage, the module does not act.
Setting:
The first step, 4 and 5 input working power, adjust the 11th, get the value of the reference voltage by testing the 11th pin; (the black test lead of the multimeter is placed at 5, the red test lead is tested 1)
The second step is to input the voltage signal to be compared from No. 3. The negative electrode of the voltage signal to be compared is connected to 2. If it is a common ground, it does not need to be connected to 2.
Conclusion: If the voltage of No. 3 is higher than the set reference voltage No. 1, then the 9th light is on, the relay is closed, 7-6 is on, and 8-7 is off;
If the 3rd voltage is less than or equal to the set reference voltage (1st), the 9th light is off and the relay keeps 8-7 on.
Function two description
Function 2
Input two voltage signals to be compared to 1 and 3 respectively. When voltage signal 3 is greater than voltage signal 1, the relay is closed; when voltage signal 3 is less than or equal to voltage signal 1, the relay does not act.
Setting:
The first step is to remove the jumper at position 10;
The second step, 4 and 5 input working power, input the voltage signal to be compared from 1 and 3 respectively, and the negative pole of the voltage signal to be compared is connected to 2, if it is a common ground, it can not be connected to 2.
Conclusion: If the voltage of No. 3 is higher than the voltage of No. 1, the light is on, the relay is closed, 7-6 is on, and 8-7 is off;
If the voltage of No. 3 is less than or equal to the voltage of No. 1, the light is off and the relay keeps 8-7 on.
Function three description
Function 3
Input-a voltage to be compared with the reference voltage set on the module (the reference voltage can be set by the adjustable potentiometer on the module) to compare. When the input voltage is less than the set reference voltage, the relay is closed; when the input voltage is less than or equal to the reference voltage, the relay does not act. (The opposite of function)
Setting:
The first step is to set the 10th jumper to function E mode according to the figure
The second step, 4 and 5 input working power, adjust the 10th, get the reference voltage value by testing the 3rd; (The black test lead of the multimeter is placed at 5, the red test lead is tested 3)
The third step is to input the voltage signal to be compared from No. 1. The negative electrode of the voltage signal to be compared is connected to 2. If it is a common ground, it can not be connected to 2.
Conclusion: If the voltage of No. 1 is lower than the set reference voltage (No. 3), then the 9th light is on, the relay suction stage, 7-6 is on, 8-7 is off;
If the voltage of No. 1 is greater than or equal to the set reference voltage (No. 3), the ninth light is off and the relay keeps 8-7 on.
Tinker_740
2025-08-05 16:52:43
This review is for the Taidacent LM393 Voltage Comparator Relay Module, 1 Channel, 12V.The unit is assembled perfectly and with good components. Nothing broke or dislodged while fitting to the application.I used it in an automotive application on a Chevy 3500 truck that has turn signal LEDs in the side tow mirrors. I used the module relay to turn off the turn signal LEDs in the side mirrors at night because I don't like the strobe/glare at night.I powered it with 12vdc and triggered (compared) via a pulse-width modulated (PWM) signal wire. The instrument dimmer on the dash supplies a PWM signal which illuminates the backlit LEDs in the door switches at night or when the parking or headlights are on. That signal is used to trigger the module relay to activate and open the turn signal wire to the LEDs in the mirror. I used one in each door. It works perfectly for my application. Since I used a PWM signal, the potentiometer adjustment has no affect but does not matter because the comparator is still triggered - even if the instrument panel dimmer is turned all the way down. I have no doubt the adjustment affect would be maintained if you were using it on a standard dc voltage signal instead of a PWM circuit.I could have built a module like this but the quality and craftsmanship would not have been as good and the cost for parts likely would be the same. Bonus - the included box, cover, and screws is a perfectly snug fit. You can mount the board in the box or on the inside of the lid using the included screws into the pre-molded stand-off holes. I mounted mine to the inside of the lid which permitted the board to be removed with the lid for easier wiring connections. The only hole I had to drill was for my wiring in and out of the box.I would definitely buy from this company again. The quality is perfect but the included box is the deal-sealer.
R. Shine
2025-08-02 15:04:31
I got the 12V version of this module. It came with a nice enclosure. I had to do so research on the web to figure out how to use this product for example, the jumper settings to access the 3 functions. It worked well once I got it set up.There is about 30 mV of hysteresis which prevents problems if the input voltage = comparator voltage.I also saw about 300 to 400 uS of jitter until the output of the relay was stable.I would be nice to see some use examples of the 3 functions.This module is built well and will serve my purpose for driving heavy loads.Enjoy!
Chaz
2025-06-18 15:31:09
I use this to switch on my 12V bike lights and 12V motorcycle dashcams automatically from my bike's normal hub generator. The built-in comparator is a much smaller load than a relay coil, so it can be switched by tiny signals, while the output is a standard 10A automotive relay, so it can switch big loads. The comparator also allows some adjustment, and by putting a capacitor across the input you can make the device latch on for a given amount of time.I bought a 5V one but it actually has a 12V relay on it. It works fine at both 12V and 5V, so I don't know if the 12V and 5V parts are actually any different.
Geo Brecke
2025-05-31 17:47:46
I bought this device to operate as a dump or diversion load for my off-grid 24V battery plant, when the battery is above 26.8 volts, I want to close the relay and allow nonessential loads to run, if it drops below that, I want the relay to open.I think the pot is bad, so I'll attempt to get this one replaced and try another one. It would be nice if the documentation was better.
Luis Fonseca
2025-04-11 12:56:15
Excelente articulo
MSY
2025-03-15 14:11:35
The package didn't contain any documents. So be sure to save the Amazon page as it has it on there and might go away sometime. Easy to use and several modes can be setup. Not clear on the range in inputs that are allowed on the competitor input terminals, I'll look up the IC they are using and see if there is any resistive divider on the input pins to account for. Mine says 12v, so I guess that is the voltage it runs on the power supply terminals. The relay outputs are fully isolated as I intend to use 120vac. The little box is nice to hold it and you drill what holes you need for the wires.
James Chin
2025-03-11 18:19:51
works for my applicatiom in triggering a 24 volt system with a low voltage adjustable from 0.1 -24 volts.
Christopher Galfo
2025-02-05 14:51:06
Sometimes you need to switch a circuit ON or OFF whenever a voltage goes above or below a particular value and that’s exactly what this little relay board does. When I unpacked this item, I was pleasantly surprised that a small black plastic enclosure and 4 mounting screws was also included, although there is no mention of the box in Amazon’s description. It is just slightly larger than the circuit board itself and it certainly could be useful to protect the board from dust and dirt (although it's not waterproof - see my photo).Here are a few things that I learned when evaluating this circuit board:1) It has very modest power requirements. The board I tested was the 12V version and it draws just 5.5 mA when the relay is not engaged (blue LED OFF) and 30 mA when the relay is engaged (blue LED ON).2) The “trip†voltage (reference voltage) is set by adjusting the multi-turn potentiometer (VR1) on the circuit board. I could easily set it to any value between zero and the supply voltage (in my case 12V) and could get reliable operation with a value as low as 30 mV.3) If you don’t want to use the reference voltage set by VR1, simply remove the circuit board jumper JP2 and then connect your input signals to inputs IN- and In+ for direct voltage comparison.In conclusion, this board works as described and as an added bonus you also get a small black plastic box that you can use to mount it and protect it. If you found this review useful, please let me know. Thank you!
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