This FM transmitter route (circuit) utilizes four radio incidence
steps: a VHF oscillator construct roughly transistor BF494 (T1), a preamplifier
construct about transistor BF200 (T2), a driver construct about transistor
2N2219 (T3) & a power amp built about transistor 2N3866 (T4).
A condenser microphone is related at the effort of the oscillator. Running of the 1(one) Watt transmitter route (circuit) is easy. When you talk close to the microphone and frequency-modulated indications are attaining at the aerial of oscillator transistor T1.
FM Transmitter circuit diagram:
The FM indications are augmented with the VHF preamplifier & the pre-driver step. You can as well apply transistor 2N5109 in rest of 2N2219. The preamplifier is a melody class-A RF amp & the driver is a class-C amp. Indications are lastly supply to the class-C RF control amp, which carry RF control to a 50-ohm level dipole or position plane mast.
Apply a heat-sink by transistor 2N3866 for warmth indulgence (message: or 2N4427 as it works improved at 12 V & carry up to 1 watt RF control). Cautiously regulate trimmer VC1 related across L1 to produce incidence inside 88-108 MHz. Also regulate trimmers VC2 during VC7 to get utmost output at utmost choice.
Controller IC 78C09 offer stable 9V provide to the oscillator, as a result difference in the provide voltage will not change the incidence produce. You can as well apply a 12V battery to control the circuit. Collect the circuit on a universal point PCB. Put in the mast properly for utmost choice.
Curls L1 during L5 are complete with 20 SWG copper-enameled supports sore above air-cores having 8MM width. They have 4, 6, 6, 5 & 7 revolve of wire, in that order.
Message: This transmitter is destined only for learning function. Apply of this transmitter by outdoor mast is illegal in mainly element of the world.
A condenser microphone is related at the effort of the oscillator. Running of the 1(one) Watt transmitter route (circuit) is easy. When you talk close to the microphone and frequency-modulated indications are attaining at the aerial of oscillator transistor T1.
FM Transmitter circuit diagram:
The FM indications are augmented with the VHF preamplifier & the pre-driver step. You can as well apply transistor 2N5109 in rest of 2N2219. The preamplifier is a melody class-A RF amp & the driver is a class-C amp. Indications are lastly supply to the class-C RF control amp, which carry RF control to a 50-ohm level dipole or position plane mast.
Apply a heat-sink by transistor 2N3866 for warmth indulgence (message: or 2N4427 as it works improved at 12 V & carry up to 1 watt RF control). Cautiously regulate trimmer VC1 related across L1 to produce incidence inside 88-108 MHz. Also regulate trimmers VC2 during VC7 to get utmost output at utmost choice.
Controller IC 78C09 offer stable 9V provide to the oscillator, as a result difference in the provide voltage will not change the incidence produce. You can as well apply a 12V battery to control the circuit. Collect the circuit on a universal point PCB. Put in the mast properly for utmost choice.
Curls L1 during L5 are complete with 20 SWG copper-enameled supports sore above air-cores having 8MM width. They have 4, 6, 6, 5 & 7 revolve of wire, in that order.
Message: This transmitter is destined only for learning function. Apply of this transmitter by outdoor mast is illegal in mainly element of the world.
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