Can not read schematics.

Discussion in 'Wireless & RF Design' started by nerdegutta, Apr 20, 2010.

  1. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,517
    785
    Hi,

    does anybody have readable version of these schematics?

    I'm planning to build a remote control.

    I found the schematic here.
     
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  2. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    these seem very readable to me, what seems to be the issue with them, besides being poorly copied??

    B. Morse
     
  3. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,517
    785
    It is the transmitter schematic. I can not get all the values...
     
  4. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    how's this?? I edited the pic and added text next to the values....
    tx_edit.gif

    B. Morse
     
  5. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,517
    785
    Great!

    Thank you very much. :)
     
  6. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The circuits are extremely cheap and simple. They use 27MHz so the antennas are very long or the range is very short.
    All the receiver does is turn something on if the transmitter is turned on nearby or if there is interference.
     
  7. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,517
    785
    Hi.

    That's all I need.

    This is what I want:
    I'm a lazy guy, and I sometimes forget to close the garage door. I want to build a gadget that sends a signal, preferable RF, when I have forgotten to close the door. Inside the house, I want to have a little display, with one LED. This LED lights up when the door is open, and is off, when the door is closed. When the door is open, it will close the circuit, and a signal is sent.

    Any comments, suggestions or advice?
     
  8. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    1,015
    69
    As it is a simple 'signal sensor' switch, it may well be operated by any signal on or near that frequency - radio controlled toys, CB radios, some cordless phones etc..

    Anything to do with security or safety (like the door not closing as you are driving in or out) is usually coded so random transmissions are ignored.
     
  9. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    If it were me and I was in my house, I'd find it much easier to just use a microswitch, some wire, an LED, resistor, and a wall wart. Now, I understand that if your garage is quite a ways from the house, running the wire might be the problem, so this might be why you want to use RF. Even in this case, one other thing to think about would be to add a laser pointer and a photodiode and perhaps a transistor or comparator. You could mount the laser to turn on and shine towards the house when the door is open. Use the photodiode to detect the signal and turn on an LED. Mount things up high so someone doesn't get the laser in their eye. While this is more work, I suspect it would be a tad easier than getting an RF transmitter/receiver setup to work.
     
  10. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,517
    785
    You are absolutely right. The garage is just next door to the house. It would be much easier to just use wires, but... you know...

    The laser idea was quite good. Where can I get one?
     
  11. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    If you still want to use RF, there are some hobby level RF modules you can get... check out this site >> http://www.rentron.com/ for different pre made modules or components to put your own RF tx/rx circuit together.


    B. Morse
     
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