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To extend the life of the radio control car battery, you can unplug the transmitter when not in use. If you want to apply an external audio signal such as an iPod, you must delete the microphone and bias resistor R1, leaving the audio input decoupling capacitor C1.
Breadboard radiofrequency and not the van, so it is very likely that if this circuit assembled on a breadboard does not work, you better go to the fixed and mounted to a plate. This can serve as a guide. Manufacture of printed circuit boards (PCB). The power supply or battery is connected in parallel to capacitor C8.
Transmitter
The radio control car transmitter can be divided into two groups: the first major block is the one responsible for generating the command signal encoding called encoder signal generator or modulator base and the second block is the one responsible to transmit encoder radio what "tells"- known as the RF stage or radio transmitter.
Encoder or signal generator base
The encoder has the function to take the information that you provide the position of the control levers or buttons to control and produce a coded signal. The interpretation of the data can be done in different ways, once in the first radio controls are not coded controls; today is necessary to control several servos and this should be occupying a single frequency of transmission to carry the information of many channels to the "same time", so it is necessary to encode the position of each of these servos. The encoding method must be such that the servo should mimic the position of the joystick as closely as possible and with minimum delay. The position is an analog variable, this means that from one point to another there are infinitely many points in between, then the radio control encoder must use a method that in addition to carrying 6-channel information, it must be analog and sent to "real time" to the radio control car servos.
Coding methods
The coding methods used are "Pulse Width Modulation" (PWM) meaning in the Width Modulation Pulse also known as "Pulse Position Modulation" (PPM) which means pulse position modulation, which is the most widely used by most radio equipment, and is used in our case.
The standard used in radio control car servo is that the position has the maximum at one end when the pulse width is receiving duration of 1 ms, the midpoint is located at 1.5ms and the maximum is opposite when the pulse has a duration of 2ms. It should be noted that these methods of encoding data to generate the signal serve basis and are not an RF modulation method.
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