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  1. R

    4W FM Transmitter

    Replaced T2 with another transistor Blw29 T2 gets hot but does not need a heatsink getting 1- 1 1/2 watts out of it I find this difficult to tune. could the tuning capacitor be replaced with one of a smaller value perhaps in parallel with another capicitor I want to run this at 88Mhz. What...
  2. R

    4W FM Transmitter

    More like the one on the right components mounted on non metalic side of board Longish component leads esp T1 ? Only difference compnents fairly close
  3. R

    4W FM Transmitter

    This problem seems to be with the oscillator power measured at point between osc and amp T1 has no heatsink! Can anything else cause this problem? can tune roughly
  4. R

    4W FM Transmitter

    Made a heatsink out of a section of thick (3mm) copper tubing lower section fits over T2  6 vertical cuts made from top  20 mm long,    pieces bent 90 degrees to tubing. small fan from cpu wired to top of heatsink Using rundown 9v battery for power while tuning Difficult,  trimmers small even...
  5. R

    4W FM Transmitter

    How large should the heatsink be?
  6. R

    4W FM Transmitter

    I build this circuit However T2 always seems to burn out after a few seconds even with heatsink! Is there a nother transister that would be good as replacement?
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