protection
Polarity protection
Dew-Point Sensor
Dew-point sensors are widely used in sensitive electronic equipment like cameras and copiers etc, to protect them from moisture failure by fast detection of dew. You can easily build one yourself using the readily-available dew sensor element as described here. Alternatively, you can use the tiny dew sensor element of your old VCR or video camera. More >
Three-Phase Appliance Protector
Many of our costly appliances require three-phase AC supply for operation. Failure of any of the phases makes the appliance prone to erratic functioning and may even lead to failure. Hence it is of paramount importance to monitor the availability of the three-phase supply and switch off the appliance in the event of failure of one or two phases. More >
AUTOMATIC PHASE CHANGER
In three-phase applications, if low voltage is available in any one or two phases, and you want your equipment to work on normal voltage, this circuit will solve your problem. More >
Inverter overload protector with delayed auto reset
The circuit presented here is an overload detector which shuts down the inverter in an overload condition. More >
CURRENT SENSOR
High-wattage appliances like electric irons, ovens and heaters result in unnecessary power loss if left ‘on’ for hours unnoticed. Here is a circuit that senses the flow of current through the appliances and gives audible beeps every fifteen minutes to remind you of power-’on’ status. More >
Short circuit Protection
Here is a valuable Add to power supply to protection electronic components in the assembled board from damage from short circuit. It gives warning beep if there is a short circuit in the assembled board. Thus it helps to switch off the power supply immediately to save valuable components. More >