Jump to content
Electronics-Lab.com Community

Infrared Activated Switch


Recommended Posts

Hi Audioguru,
now i have done my project with lm567 but it didn't work as i want. I use a LED as a load. But the LED still "ON" no matter the input frequency is out from my bandwidth setting. I've try a couple solution (like add a low pass filter) but it didn't change. I use a lm567 as a tone decoder from the frequency that i was send from FM transmitter (i was use ne555 as the information frequency). Can you give me any solution with this problem? thanks, and i hope your reply as soon as.

Link to comment
Share on other sites


  • Replies 77
  • Created
  • Last Reply

Top Posters In This Topic

Hi Indra,
Welcome to our forum. ;D
Philips recommend a 0.01uF to 0.1uF ceramic disc capacitor directly across the power supply pins of their NE567 and an additional 10uF electrolytic cap if the supply has poor voltage regulation like from a battery. They also say to be careful with signal routing and to avoid ground loops.

Try disconnecting the input capacitor of the 567 from its driving stage and connecting the capacitor to ground instead to see if the LED turns off. If it does, then the problem is with the driving stage. ;D

Link to comment
Share on other sites

  • 2 weeks later...

Im baaaack!

Wow, that took longet than i expected. Was fun though.

I see someone has built this project, or part of it. and is having some trouble. I couldn't quite understand what he/she wrote. Maybe you can shed some light on it?

I presume the cuircuit i should build works fine???? you know, the one with the TL072 and NE567.

;D

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
  • Create New...