Manage to fly your rc helicopter model wisely

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(Free-Press-Release.com) January 19, 2012 -- Find out about the best rc helicopter procedures. You can add amazing features. The first stage is a microphone amplifier with two pins. The gain of this pre-amplifier is given by dividing the sum of the resistance of the potentiometer 100K + on the resistance of 4k7, modifying these values results in more or less gain, depending on the intended use. The resistive divider on pin 3 of integrated circuit is to use the op amp with a single source and not starting.

The second stage is the amplifier, the LC tank determines the frequency, and the 10 nF capacitor influences the stability of the circuit (using a good quality capacitor). This stage is split into two, first with the first stage comprising transistor oscillator, and the second forming the amplifier. This makes the circuit more stable. Do not connect the antenna directly to the coil, causing a leak and frequency to the antenna closer to objects or hands.
Even when you touch the rc helicopter antenna, if the frequency is not running, at most there will be a low power, but no frequency shift. To increase power, decrease the resistance (47ohm) the issuer of the last transistor to a minimum of 22 ohm, but will increase consumption. Try to even change the last 2N2222 transistor and a voltage increase of supply. This is another step in our power FM station, this time with an output power of around 70 watts, from just twenty.

The heart of this stage is an RF transistor (the BLY90) which, together with the classical passive components such systems, fulfills the function of amplifying the radio signal present at its base to deliver on its collector.
Their food is 14V with a current of 7 to 8A. It is almost impossible at this stage parasitic oscillations occur. Second harmonic suppression is better than 45dB.Medidor Signal (SMET). Something that is really useful, but very few of the home teams include the signal meter. It allows to know precisely the magnitude of the signal is entering the receiver.

As seen in the rc helicopter circuit, it is extremely simple to assemble, and to understand. The signal enters through a decoupling capacitor, which must have a value between 10pF and 220pF taking into account that the lower value will be charged unless the receiver circuit. After being pre-amplified by the transistor RF signal to a second transistor which acts as an amplifier!

More information can be found online at http://www.dinodirect.com/rc-helicopters/

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