How to connect a sound circuit to a transmiter

Discussion in 'General Electronics Chat' started by anilson, Oct 3, 2007.

  1. anilson

    Thread Starter New Member

    Oct 2, 2007
    I am just starting in electronics. Please any help.

    I have two circuits very similar to these ones.
    - transmiter circuit (
    - sound circuit (

    How can I transmit the sound from that sound circuit trough the this specific transmiter??? where should I connect one to another.
    I used the transmiter to transmit Mode code to a FM radio, but now I want to transmit the sount produced from that sound circuit. And I don't want to use microphones. Can anyone help me, please???
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    Put a PNP transistor in series with R1 of your transmitter (Emitter to battery and Collector to resistor). Vary the conductance of said transistor with the output of your audio circuit. You will need to experiment a bit to get things right.

    Read this, it will help a lot: