This circuit takes standard 0-10V control voltage (for example from analogue light controlling desk) and outputs a standard 1-2 ms RC servo motors control pulse. In this circuit NE555 is configured as astable multivibrator. The main timing capacitor (220 nF) is always changed to the voltage level which is determined by the voltage on NE555 pin 5 (in this circuit that voltage is aroun 1.6V). When the timing capacitor is charged only with current coming through 33 kohm resistor, the charging takes around 2 milliseconds. When control voltage is appied to control input, the charging current increased when conrol voltage increases. When th econtrol voltage is 10V, the charging takes around 1 millisecond.
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