Crystal locked FM transmitter

Discussion in 'Wireless & RF Design' started by Will777, Sep 13, 2010.

  1. Will777

    Thread Starter Member

    Sep 12, 2010
    48
    1
    Hi,

    I've built a few FM transmitter kits - always with a coil. I've found that these kits always drift in terms of frequency.

    I've seen a few circuits online for crystal-locked FM transmitters but a lot of them use crystals that are very hard for me to find in the country where I live, and in terms of cost it's hard to justify the cost of importing a crystal from overseas.

    Some circuits state you can run a 10 MHz crystal (which I can source over here) in its "third overtone mode" to reach a frequency of 90 MHz.

    This is the one circuit I found:
    http://www.talkingelectronics.com/projects/CrystalLockedBug/CrystalLockedBug-1.html

    Circuit:
    [​IMG]

    People seem very familiar with the talkingelectronics website - I was wondering if anyone has built this circuit?
     
  2. Will777

    Thread Starter Member

    Sep 12, 2010
    48
    1
    I thought I'd just clarify my question - if someone has built this circuit, great, would be fantastic to get feedback - else, can someone have a quick once-over and tell me if the design seems sound?
     
Loading...