Over voltage and under voltage protection circuit for high and low voltage cutoff.
Over voltage low high voltage cutoff circuit diagram.
As shown in the circuit diagram a couple of transistor stages are integrated together along with an output relay which is able to perform the function of super safe voltage guard equipment.
The op amp is available in to 5 and dip type packing.
Low voltage cut off op amp figure 2 shows the use of very common and easily available op amp 741 as a comparator.
When too much voltage 220v and protection when pressure is too low with using the relay cut off power when voltage problems.
Rechargeable batteries deliver very good performance and life if we take care of them.
So it helps to protect the circuit damage by the high voltage.
High and low voltage cutoff with delay and alarm principle.
As a result transistor q1 is in on and transistor q2 gets switched off.
Before using this circuit set the preset and check the relay or output to at which input voltage level relay gets activated.
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.
There are many things which can be done to take proper care and protect your rechargeable batteries which are not over charge.
If you use this circuit for autocut on over 6v then use 6 v relay and circuit need 6v.
This is an over and under voltage protection circuit device sound disappeared.
High voltage low voltage cut off circuit.
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.
When supply voltage is high the dc voltage at the cathode of zener diode d4 becomes greater than 5 6v.
Plzz tell me the high low voltage cutoff with delay and alarm with some modification and advancement in circuit diagram.
Here is a very useful project of low battery voltage cutoff or disconnect circuit.
In particular if the voltage of the motor is lower the coils of it can be a burn.
An ac mains high low cut off device will cut off or disconnect the mains supply from home electrical whenever a high voltage or low voltage situation is detected.
As explained above the transistors sense the presence of the dangerous voltage levels respectively and activate.
