Receive Signal Decoders


Posted on Jun 28, 2012

The signal output by the radio control receiver is a form of PWM. This may be useful for driving servos, but is inconvenient for general electronic applications. Therefore, several of the circuits on this site convert this signal into a voltage first. This is performed by this circuit. It is not a project in its own right, just a building block used by other projects. First we must see what these signals look like. There is a document here which describes servo signals in some detail, but Ill reproduce the timing diagram here for simplicity.



A positive-going pulse is sent at regular intervals, at most every 30ms although some manufacturers have a maximum of 20ms between pulses. The width of the pulse is between 1ms and 2ms. A 1ms pulse will cause the servo to turn to its minimum extremity, an




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