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marvellous

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  2. Another 4watt Transmitter Question

    in Projects Q/A

    Posted

    My project mesures 134ma from the battery

    I have just canged my L2 to 1M 2w and 15turns of 0.2mm(insulated)
    also changed R3 to 47e 2W
    changed Q1(T1) to 2n2219

    changed Battery to powersupply(lm317 based 2A transformer)set @ 15V

    now Q2(or T2) is getting verry hot
    Q1(or T1) is just warm
    Signal is stronger and better quality!

    It will be very difficult for you to tune C7 and C8 for maximum output without a signal strength meter, a helper and walkie-talkies. It should transmit a couple of kilometers. Can your helper scream that far?


    would Field Strength Meter
    http://braincambre500.freeservers.com/field%20strength%20meter.htm
    work for tuning?
    (We can Use Cellphone for communication)

    would the antenna
    http://braincambre500.freeservers.com/open%20end%20half%20wave%20dipole%20antenna.htm
    work for this project?



    Thanks the help I'm getting is appreciated! :) ;) :D8) ;D
    (only to think I nearly gave up on this project!)

  3. Another 4watt Transmitter Question

    in Projects Q/A

    Posted

    Thanks for the reply
    I got my circuit working (C4 was broken)
    I Can transmitt to radio
    but none of the transistors get hot ???
    (ran it without heatsinks on both transistors)
    also the range is short about 5meters

    I used a 4.5Ah 12v battery for powersupply!
    I used a 2n2222a for t1
    I used a 30Cm 1.5mm wire for antenna (soldered onto the Pcb)

    Will try your suggestions today for it and keep you posted on it!

    can I use 0.2mm insulated wound around a 1Meg resistor
    Thanks in advance!

  8. Another 4watt Transmitter Question

    in Projects Q/A

    Posted

    Im a newB & im Busy Building the http://www.electronics-lab.com/projects/rf/021/index.html and
    have a couple of questions? ???

    How do I make the Inductors do I use
    Enarmelled (insulated)Wire or Do I Just use Bare Wire?
    Should My windings be spaced apart or should ther be close together?

    Is it possible to substitute 2n2222a for T1

    Thanks in advance! :) ;) 8)

  9. 4 watt fm transmitter

    in Projects Q/A

    Posted

    i am building http://www.electronics-lab.com/projects/rf/001/index.html

    and i would like to know do I build the RFC1, RCF2, RCF3
    or do you buy it off the shelf? (cant find it here in South Africa)

    can I just buy the bead and make it?(what kind of wire would I need)

    I'm a Newb in RF electronics!

    Thanks in advance!

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