Radio Control Signal Frame-rate Divider

Model radio-control equipment has evolved considerably over the years, and the humble servo has grown from the 1.5 ms at 50 fps (frames per second) format, to the more precise and powerful digital variety using, typically, 400 fps, and accessories such as helicopter gyros have evolved to make use of these improved servos. As a result, the later generations of gyros often only provide the 400 fps ‘digital’ signal, which is not suitable for use with the older ‘analogue’ servos. All is not lost, as this circuit allows only one frame in eight to reach the servo, replicating the 50 fps system.