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Setting up a webcam sight illuminator over your laptop's webcam will certainly “enlighten” your online conversations. This voltage indicator, shall work well with high input impedance transistors (JFET, MOSFET).
Simple and nice circuit but what happens when you have 12V or more on battery and adjust the variable resistor to zero ?
Recent QuestionsTimer for Varroa Mite Treatment electronically controlling a 220V heating wire To run Microwave when power supply isn't there, what type of battery can I use Problem with playing back voices how can an AVR get a generated sin wave by matlab,using serial interface and realize it using DAC? This simple circuit protects an SLA battery from over-discharge by disconnecting the load when the terminal voltage drops below a preset level.
However, when the op amp’s output is driven low, Q1 is switched off, causing the non-inverting input to rise towards the full battery voltage.
Changing the position of the trimpot doesn't do much, the output of the OPAMP just varies a little bit. If not, when reset button is pushed you should have 4.7V on P2, and P1 should be the supply voltage and should switch the load on.

Otherwise, the BJT will source some current to the trimmer and the voltage drop across the zener will not serve as a reference for activation or deactivation.
In operation, a sample of the battery voltage is derived from the 22k? resistor and 20k? trimpot divider.
I picked up the components to build this, but am having difficulty getting it to shut off the output. I was thinking that the easiest way of doing this would be to essentially bypass the 22k resistor on the variable voltage divider with a much smaller value one (maybe like 330 ohms or so) connected to a switch. The led glowed when voltage was high and didn’t glow when voltage was low, instead of the other way round.
There were about ten different manufacturers and all failed after a while on 72 volt systems. This is applied to the non-inverting input (pin 3) of IC1, where it is compared with a reference voltage on the inverting input (pin 2).
When using a variable output power supply, even when I get the input down to 1.3 volts, the output is still turned on.

If any of these is not the case, check your diodes are the right way round and check resistors with your ohmmeter. That way, when you push the button, it would make the OP-Amp think that the target voltage was much higher, and would kick the output off.
When the sampled battery voltage falls below the reference voltage, IC1’s output (pin 1) swings towards ground, switching Mosfet Q2 off and disconnecting the load from the battery.
The reference voltage is derived from a 4.7V zener diode (ZD1), which is connected to ground via the collector-emitter circuit of Q1 (ie, when Q1 is on).
As is usual practice, a diode should be connected across the relay coil to limit back-EMF spikes.

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