hi there,
i design a circuit that uses relay,after i have finished building and soldering every thing was working properly to design specification but if i should use the relay to control an appliance using using an AC supply the relay becomes unstable that is clicking at avery fast rate making the output unstable or fluatuating. please can some one help with a solution...

 

We need a schematic to see what might be wrong.

 

hi there,
i design a circuit that uses relay,after i have finished building and soldering every thing was working properly to design specification but if i should use the relay to control an appliance using using an AC supply the relay becomes unstable that is clicking at avery fast rate making the output unstable or fluatuating. please can some one help with a solution...

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well..normally such problems occur when the supply voltage to the relay coil is not enough..for example if u use a 12DC relay and u are giving 9v means the problem occur ...or else there should be a problem with the driver circuit whis is normally a transistor.."don't forget to use a diode" across the relay coil to prevent back EMF from damaging your driver transistor....an another way of switching AC loads is using TRIACs ....please refer to these relay driver schematics

 

the relay works properly but once is made to control AC THE PROBLEM START.

 

make sure your relay is rated for 120v ac and for the right current. you should use one set of contact to f/b some histerisis to latch it up.

 

i don't undestand pls can you explain more.in my location we use 230V and the relay is rated for 230V and 200 ohm.