Low High Voltage Cutoff Circuit Diagram

As a result transistor q1 is in on and transistor q2 gets switched off.

Low high voltage cutoff circuit diagram.

The main building block of this circuit is timer ic 555 voltage regulator ic and few other active as well as passive electronic components like transistor resistor capacitor etc. Automatic high voltage and low voltage cutoff circuit12. Plzz tell me the high low voltage cutoff with delay and alarm with some modification and advancement in circuit diagram. This voltage sensor circuit can be used to protects any appliance to voltage fluctuation.

Over voltage and under voltage protection circuit for high and low voltage cutoff. When supply voltage is high the dc voltage at the cathode of zener diode d4 becomes greater than 5 6v. When the input voltage goes high then the relay will be activated and also when the input voltage is below then required level then relay activated. High and low voltage cutoff with delay and alarm principle.

Before using this circuit set the preset and check the relay or output to at which input voltage level relay gets activated. The op amp is available in to 5 and dip type packing. An almost ideal low battery cutoff circuit draws only 1 2 μa. Low voltage cut off op amp figure 2 shows the use of very common and easily available op amp 741 as a comparator.

So it helps to protect the circuit damage by the high voltage. As explained above the transistors sense the presence of the dangerous voltage levels respectively and activate. Juliet 8 years ago plzzzzz tell me the size of the auto transformer to be used and i didnt get what is no n where exactly the appliance to be checked should be kept kind request to you to send me all the details of working. The circuit utilizes a single ic lm 324 for the necessary detection and instantly switches the relevant relays so that the connected loads are isolated from the dangerous inputs.

An ideal low battery cut off circuit should have zero on resistance zero power consumption when the switch is off and zero power. If you use this circuit for autocut on over 6v then use 6 v relay and circuit need 6v. The ac mains high and low voltage cut off circuit explained in this article is very easy to build and yet very reliable and accurate.