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Radio Control Signal Frame-rate Divider Schematic Circuit Diagram

Evolution of Model Radio-Control Equipment: From Analog to Digital Servos

Over the years, model radio-control equipment has undergone significant advancements. Servos, once operating at 1.5 ms and 50 frames per second (fps), have now transitioned to the more precise digital variety, running at 400 fps. Accessories like helicopter gyros have adapted to these powerful servos, but this progress poses challenges. Newer gyros often produce a 400 fps ‘digital’ signal, rendering them incompatible with older ‘analog’ servos.

A Solution for Compatibility: Replicating 50 fps System

This circuit offers a solution by allowing only one frame out of eight to reach the servo, effectively replicating the 50 fps system. The prototype version, constructed with standard ICs, discreetly fits beneath the gyro, like the CSM720 in the test setup, to provide the necessary analog output. Employing a Type 4017 CMOS decade ring counter, the circuit is clocked by the falling edge of the input through the CP1 (enable) pin and reset by output 7, ensuring compatibility between older analog servos and modern digital gyros.

Radio Control Signal Frame-rate Divider Schematic Circuit Diagram 1

Radio Control Signal Frame-rate Divider Schematic Circuit Diagram 2

Radio Control Signal Frame-rate Divider Schematic Circuit Diagram Components list

Pulse Divider Operation: Ensuring Precise Output Pulses

Upon reset, the first input pulse activates output 1, permitting the subsequent pulse to reach the output via a CMOS 4081 OR gate. This mechanism ensures that only one pulse out of every eight is directed to the output. Utilizing negative logic for the AND function eliminates timing glitches, establishing a stable gating signal before the input pulse, maintaining stability throughout the pulse duration.

Adjustable Divider Ratios: Flexibility in Output Configuration

Flexibility in divider ratios is achieved by selecting the appropriate output for the reset function. The circuit’s design incorporates a miniature PCB featuring surface-mount device (SMD) components, optimizing space utilization for integration into models where space constraints are critical. Encapsulating the circuit in heat-shrink sleeving provides an additional layer of protection and ensures optimal performance.

Understanding CMOS Technology: Core of Modern Integrated Circuits

Complementary Metal-Oxide Semiconductor (CMOS) technology serves as the foundation for most contemporary integrated circuits (ICs), commonly referred to as chips or microchips. CMOS transistors are based on Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) technology, making them integral components in various digital circuits. This innovation finds applications in microcontrollers, static RAM, registers, and other digital circuits, shaping the landscape of modern electronics.

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