Based on the complete rc helicopter circuit presented in most rc hobby clubs, the operation of the transmitter can be described as follows. The high-frequency transistor Q1 operates as RF oscillator at a frequency of about 72MHz.
There are many rc helicopter important components like the transmitter and the circuits. For Q1 you can use virtually any RF transistor for general use, as the BF494, 2N2218, BF254, etc.. Our project will be described in terms of BF494 and, therefore, illustrative designs will be made depending on the arrangement of the terminals of this component. Many silicon NPN transistors are commonly used as the BC237, BC238, BC239, BC547, BC548, BC549, etc., all with the same terminal arrangement shown in the drawings. Q2 and Q3 form an unstable multi vibrator which is responsible for the production of the modulating audio signal.
Discover the main diagram and model of the basic circuit. This circuit is not critical because there is no need for the same exact frequency produces audio. The important thing is to swing producing an audio signal between 200Hz and 2.000Hz. These multi vibrator capacitors are basically determined by the frequency of operation.
Assembly
As noted, the assembly can be done either terminal bridge as printed circuit board. Then, starting from a basic diagram we have mounts in printed rc helicopter circuit board. For mounting, use a small power welder fine tip, welding quality and additional
tools, side-cutting pliers and a screwdriver. Remember that the assembly must be done carefully, with the components rather close to each other, but not touching. In the editing process you must observe for the following care:
- When soldering transistors, observe the position they have, because depending on which side of the roof flat. Avoid excessive heat in this operation, since the transistors are sensitive components.
- Observe the polarity of the electrolytic capacitor, marked on your own deck. This capacitor can have any value between 47¼f and 100¼F with a working voltage from the 12V, that is, the minimum value marked on the cover should be 12V.
The rc helicopter resistors can be ¼ or 1/8W, but care should be observed with the value given by colored rings. There is no polarity for connection and mounting cut-side terminals suitable location for a compact. The reader can choose the type of plastic or porcelain base, as desired. During assembly of the type of porcelain note its position so that the moving armature or external positive terminal being connected to the feed and the internal reinforcement to the collector of rc helicopter transistor. If this placement is not taken into account, the device works so unstable.
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