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A wide variety of transistors radio control helicopters projects

You can follow easy steps to modify transmitters and radio control helicopters systems. Remember the coil must be balanced and in parallel with 47pF trimmer. It is formed by 3 turns of 0.5mm wire on a ferrite core 5mm.

You can easily build a new radio control helicopters add-on. The first transistor (which amplifies the signal from the speaker) acts as a modulator of the carrier generated by the second, which oscillates at the frequency set by the set LC. The RC group placed properly polarized base itself. The antenna is placed at the collector, before disengagement by means of a small capacitor.

FM Transmitter

Find a transmitter for the commercial FM band that will provide up to 18 watts of power. Entering an audio signal 1Vpp standard, which may come from a mixer or a stereo coding stage, the system, can cover an entire medium-sized town of low houses or entire neighborhood in a city. If required you can build more power and interconnect output stages to increase the coverage area of the station.

First tune in a radio (preferably digital, high-quality) with a dial position where there is no station broadcasting. Then turn on the transmitter and turning the 47pF trimmer, tune the transmitter so that the audio signal present at the inputs to be heard in the receiver. If the input signal is too strong (it shows when the receiver hears distorted) will be convenient to put knobs on the transmitter input to lower the sensitivity.

After about ten minutes of thermal stabilization, the frequency drift of the issuer reaches a minimum value, provided that the installation has been completed following the instructions given, i.e. the coil resting on the rigid printed circuit, power and antenna described and finally the introduction of the next in a metal box that will electric armor. Power radio control helicopters connections and input B.F. be kept as short as possible.

Special attention should be taken when attempting to disarm because we know the ferrite know that has nothing to do with any ductile material when working. Any error or bad efforts and crack!

So it will be convenient to have patience and special radio control helicopters care if we loosen the varnish that covers any solvent because if the latter penetrates too inside the transformer can affect the primary winding insulation which by now or we play. Our work will redo the first four laps as we see fit "with the addition of one more turn" in this way to reach 13.7 v approx. because if we had before with 7 laps 12 Volts (3 +4) we urn the ratio.  At +12 Volts output diodes originally brought for 3 or 4 Amperes, in this sense, we will reverse its position and move large diodes to the output of 13.6 Volts and 12 Volts from the old to the output of 5 volts.

Article Tags: Radio Control Helicopters, Radio Control, Control Helicopters

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