Saturday, 12 February 2011

27MHz TRANSMITTER

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The transmitter is a very simple crystal oscillator. The heart of the circuit is the tuned circuit consisting of the primary of
the transformer and a 10p capacitor. The frequency is adjusted by a ferrite slug in the centre of the coil until it is exactly the
same as the crystal. The transistor is configured as a common emitter amplifier. It has a 390R on the emitter for
biasing purposes and prevents a high current passing through the transistor as the resistance of the transformer is very
low.  The "pi" network matches the antenna to the output of the circuit.

2 comments:

  1. I can’t wait to read more of your works. Having read this I believe it’s beneficial and insightful. Cheers!

    www.n8fan.net

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  2. I read your blog.I thought it was great.. Hope you have a great day. God bless.

    Camille
    www.imarksweb.org

    ReplyDelete