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  • jammer
  • fm
  • transmitter
Related

schematic help

dirtdiver
dirtdiver over 13 years ago

Hi everyone,

now my question isnt arduino related , but i couldnt get the answer somewhere else so i thought that some of you guys might know the answer.

OK so i have a schematic for an FM jammer/transmitter - its both as it jamms the signal by transmitting nothing.

image

I want to change that nothing to a something (and i know for a fact that its posible with that schematic)So I need to hook up a 3.5mm jack somewhere on that schematic, my gues would be to connect it between the 0.01uF cap and GND , but am I correct? if not do you know where am i supposed to connect it to?

Again sorry that its not arduino related but any help is highly appreciated!

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  • Former Member
    Former Member over 13 years ago in reply to dirtdiver +1
    You are building an FM transmitter. You don't put an ear piece on the transmitter thats what the receiver is for.
Parents
  • Former Member
    0 Former Member over 13 years ago

    You will need a little more then that to add audio. Check this out.

    image

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  • dirtdiver
    0 dirtdiver over 13 years ago in reply to Former Member

    Crap.Ok first is the electret mic like a 3.5 mm jack? I mean can it be replaced with one?

    And this guy made it work with a  schematic using only one transistor and he claims that he used that exact schematic, he just cant remember where he wired the 3.5mm.Are you absolutely positive that it wont be so easy?

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  • R_Phoenix
    0 R_Phoenix over 13 years ago in reply to dirtdiver

    Wire up a jack, connect the ground, plug in a ear peice and test different points. The worst that can happen is you pop the ear peice.

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  • Former Member
    0 Former Member over 13 years ago in reply to dirtdiver

    I take it you where going off this site.

    http://www.circuitstoday.com/fm-radio-jammer

     

    That is designed as a jammer only. All it has to do is flud the airways with noice to block out any other signal on the set frequency. Its only half the circuit needed if you actually want to transmit a decernable audio signal. The circuit needs to have 2 transistor in order to amplifiy the signal from teh microphone enough to get a good audio signal through to the receiver. The circuit your working with right now at best could transmit mourse code using key wired between ground and the negative lead of the capacitor. You can try putting a mic there but like i said you will have a hard time hearing it through a radio.

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  • dirtdiver
    0 dirtdiver over 13 years ago in reply to Former Member

    Ok, so i guess i will have to go with the schematic you provided, and again, can i replace the mic witha  3.5mm in that circuit?

    And what are the properties of L1 how many turns ?AWG  diameter?

    Thansk

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  • dirtdiver
    0 dirtdiver over 13 years ago in reply to Former Member

    Ok, so i guess i will have to go with the schematic you provided, and again, can i replace the mic witha  3.5mm in that circuit?

    And what are the properties of L1 how many turns ?AWG  diameter?

    Thansk

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  • Former Member
    0 Former Member over 13 years ago in reply to dirtdiver

    Yes the mic can be replaced by a 3.5mm jack or any other audion jack/source you want to use. Use 6 to 8 turns of 22ga wire around a pencile for L1.

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  • dirtdiver
    0 dirtdiver over 13 years ago in reply to Former Member

    Ok thatnks for the info!

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