help for my IR receiver...

[vijaya raja]

i made this exact circuit which i took from a website,but i was unable to get the o/p. could anybody help me by seeing whether this circuit is correct or wrong?????

 

[ericgibbs]

i made this exact circuit which i took from a website,but i was unable to get the o/p. could anybody help me by seeing whether this circuit is correct or wrong?????

hi,
What are you using as an IR emitter, example. old TV remote.??

 

[audioguru]

1) The IR receiver IC is missing a 4.7uF capacitor between its pins 1 and 2 as shown on its datasheet.
2) The CD4017 does not have a power-up reset circuit so it powers up at any count and you might need to press buttons on the remote a few times before it resets itself.
3) The TSOP1738 operates best from a 38kHz remote. Your remote might work at another carrier frequency.

 

[viki vignesh]

i am also using the same circuit,wat is the need for using the 4.7uF????

 

[audioguru]

i am also using the same circuit,what is the need for using the 4.7uF????

It filters away any noise from the power supply and it provides a low impedance supply that most IC circuits need. The low impedance prevents a signal from one part of the IC from feeding wrongly into another part of the IC through the power supply.
The IR receiver IC is a fairly complicated circuit with many parts that are shown on its datasheet.

 

[viki vignesh]

thanks

 

[vijaya raja]

thanks for ur help....