This circuit encodes a voltage using pulse-width modulation with a 555 timer chip. The width of the output pulses varies with the control voltage. The pulse width is set by a triangle-wave generator connected to the "ctl" input of the 555. The rest of the circuit is similar to the square-wave generator. By applying a voltage to the "ctl" input (normally 2/3 V in), we can control the voltage that ends the timing interval. When the "th" input reaches this value, the output goes low. Thus, the 555 will oscillate faster when the ctl input is lower.
This page is a utility for simulating модулятор ширины импульса на чипе 555 online with specified initial values.








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