i connected the latch with the output pins of the DMUX. . it holds the led on till we manually reset the latch. .

now
when no switch is pushed (ideal state) all the output pins of DMUX are high (that is right) when any of the switch is pushed the corresponding pin of the DMUX shows low and the led lites up(that is also correct),but the problem is that the pin which is right next to the corresponding pin is also showing a slight voltage drop because of this the latch turns on that led also


now when i remove the latch the led remains on till i hold the button and the other led also lites up but cannot b seen as it doesn't glow so brightly.

so now what i think that i need is to connect some component to the ouptut pins of the DMUX and the latch which will send low signal to the latch only if it gets a good amount of voltage drop and not send low signal of those pins where the voltage drop is very less. . .

i think i make myself clear

now i dont know which component will do the need full . .
any idea??????

 

i am working on a general PCB and some one told me that there might b some leakage in the pcb thats why i m facing the problem. . .
so i will try some good quality PCB and lets see wat happens after that

 

mayankguru, are you able to attach a copy of the latest version of your circuit? I'll take a look at it.

Brian

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Electronics Test Development Engineer
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sorry for the delay . . .
the circuit is in its final stage. .once its over i will attach the coppy here. .
appreciate ur concern..



do u hav any idea that how to connect a relay with a phone so that when ever the relay gets on,the phone will dail a particular number (already stored in the phone) some of the home security devices are doing the same stuff.but i don't hav any idea how to do that. .