[SOLVED] rf transmitter and receiver 433mhz problem

[Aravindh RS]

my leds seem to be glowing always irrespective of the switch's toggle
if anybody can help me out!!!! :-(
plzzzzzzz

 

[Venkadesh_M]

Hi post the circuit diagram.........

 

[Aravindh RS]

plz get back asap mate its quite urgent
tanzzzz

 

[reidintransit]

Not sure if it's your problem, but in breadboard I don't see chips connected to ground like in diagram.

 

[biff44]

dude, you can not do a 433 MHz board on a protoboard like that! It will NEVER work.

Breadboard one up on FR4 board instead, something with a ground plane on the back is preferred

 

[Aravindh RS]

yea tried grounding them, bt the problem become exactly the reverse i dont get any sort of output irrespective to switches

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biff44 sorry dude cudnt get you, i just tried it on a breadboard & not on a protoboard

 

[Venkadesh_M]

Is that a cross connection between the power lines??

 

[davenn]

biff44 sorry dude cudnt get you, i just tried it on a breadboard & not on a protoboard

Biff's telling you that you cannot use the breadboard like you have done
you need to use PCB .... you will have to etch a board abd mount the components
433MHz isnt likely to work on one of those breadboards ( anything over ~ 100MHz would be bad let alone 433MHz)

you cannot have all those long lengths of wire links at 433MHz

Dave

 

[Aravindh RS]

Is that a cross connection between the power lines??
View attachment 97359

nope. just extended the supply through the bread board.. its just that the power and grnd lines were interchanged in the second half of the bread board

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tanx Dave didnt know that... bt tried it in BB because saw videos were people had done this in breadboard
so is it that the lengthy wires are an hindrance to the Tx ???

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THANK YOU SO MUCH GUYYZZZZ its working fine
jst found the mistake, was so stupid, didnt power the decoder :-D
tanks for ur time peeps