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How to make a radio transmitter

Category: Electronics & Technics

How to make a radio transmitter

Radio bug

difficultyDifficulty: ★★★☆☆

timeTime: About 2 hours

ScrapFrom scrap: ██░░░░░░░░ 20%


PreamblePreamble

What can I say, I made a tiny radio transmitter to spy on somebody, I want to share the experience. It works perfectly


MaterialsMaterials

  • The electret microphone, any of the tape player or phone
  • A piece of the wire for the antenna
  • All in the scheme
    How to make a radio transmitter
ToolsTools

  • Soldering iron

    How to make a radio transmitter


  • Scheme

    Radio transmitter could be assembled on prototype plate or PCB

  • Coil

    Coil has 5-6 turns of wire thickness of 0.5 mm. I wined it around gel-pen rod. By tension and compression coil is adjusted to the desired frequency of the receiver and then fix coil with superglue.

  • Antenna

    Antenna is an insulated piece of wire

  • Capacitor

    Put a 0.01 uF capacitor between the poles of the power supply (9 volt) to protect your diy radio transmitter against interference.
    How to make a radio transmitter

  • PCB

    How to make a radio transmitter

    Author: FaMaS

ResultsResults and tips

  • Super clear sound from 15 meters distance, I can hear ticking clock
    What could be replaced
  • С4 and С5 could differ up to 2-3 pF
  • С6 could differ up to 10 pF
  • VT1 could be replaced by КТ315, КТ342 or КТ3102, BCW72
  • VT2 could be replaced by any low-powered n-p-n transistor with frequency of single amplification not more than500 MGz (КТ368, КТ316)
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