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More  Voltage Converters, Servo Circuits

Servo Pulse to Voltage Converter October 11, 2012
designed by David A. Johnson, P.E.

Servo Pulse to Voltage Converter A while back a Discover Circuits visitor needed a way to convert servo pulses from a radio controlled device into a voltage.  The drawing below, illustrates the pulse train of the received signal.  The time between pulses is a fixed 20ms while the pulse widths vary from a low of 1ms to a high of 2ms.  The visitor wanted to convert the pulses into a voltage such that a 1ms pulse width would produce 1 volt, a 1.5ms pulse would produce 5v and 2ms pulse would produce an output of 9v.  The circuit below performs this conversion.
The visitor wanted to convert the pulses into a voltage such that a 1ms pulse width would produce 1 volt, a 1.5ms pulse would produce 5v and 2ms pulse would produce an output of 9v.  The circuit below performs this conversion.

A 12 volt wall adapter is used to supply power to the circuit.  A LM317 is used to down regulate the voltage to 10v. The 0v to 5v TTL logic input pulses are first converted into 0v to 10v swings.  Those pulses are then sent through a three stage filter network.  The network averages the DC voltage, which is fed to an operational Amplifier circuit.  The circuit has a gain of 16 and a DC offset voltage of 0.466v.  The result is an output with the desired 1v to 9v swing as the pulse widths vary from 1ms to 2ms.  The response of the filter network is not super fast, so there is a delay between a pulse width change and a voltage change. The visitor did not think that the delay would be a problem.

Click on Drawing Below to view PDF version of Schematic

Servo Pulse to Voltage Converter circuit designed by David A. Johnson, P.E.

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