simple short wave transmitter


Posted on Feb 5, 2014

This low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½J gang condenser VC1, which determines the carrier frequency of the transmitter in conjunction with inductor L1. The frequency trimming can be done with VC2. The carrier is amplified by transistor T4 and coupled to RF amplifier transistor T1 (BD677) through transf


simple short wave transmitter
Click here to download the full size of the above Circuit.

ormer X1*. The transmitter does not use any modulator transformer. The audio output from condenser MIC is preamplified by transistor T3 (BC548). The audio output from T3 is further amplified by transistor T2 (BD139), which modulates the RF amplifier built around transistor T1 by varying the current through it in accordance with the audio signal`s amplitude. RFC1 is used to block the carrier RF signal from transistor T2 and the power supply. The modulated RF is coupled to the antenna via capacitor C9.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Voltage Comparator Switch
    Garden timer circuit with CD4000
    Who-is-first
    Ultrasonic-pest-repeller
    Descrete Multistage Light Sequencer
    decibel meter circuit
    an advanced web server with a microcrontroller
    555 Timer as an A/D converter
    Arduino Vocal Effects Box
    Animation with Servos



    Top