Circuit diagram of an analog circuit PWM

Posted on Mar 28, 2007

The picture shows the use of a linear potentiometer (or linear Hall element) control two chassis drive motor PWM generation circuit gamepad or joystick on the model aircraft. J1 is the handle of the

Circuit diagram of an analog circuit PWM
Click here to download the full size of the above Circuit.

socket 123 and 456, respectively potentiometer x, y in both directions. U1B provides half supply voltage, U1A is a voltage follower. x, y component of the left and right wheels via synthetic become two motor speed control voltage signal. In use, let L = (x + 1) y / (x + 1.4), R = (x-1) y / (x-0.6), tested have good results (digital units only, not the voltage value) . After U1C and U1D Schmitt oscillator consisting of a voltage converted to the corresponding PWM signal for controlling power driver circuit. In Case U1D, R1, R2 have the composition hysteresis Schmitt trigger circuit, that the upper and lower threshold of input voltage, C1 and R3 delay circuit, thus formed by the oscillation width input voltage control. Q1, Q2 is a transistor, the composition of the inverter provides the control signal difference. Analysis of the oscillator 555 on textbooks refer to the specific oscillation digital circuits.

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