This oscillator can be controlled by light if we use an LDR as a sensor, or by temperature, if we use an NTC. The main frequency is adjusted in the trimpot and depends on the capacitor. The circuit can have a positive or negative action depending on the position of the sensor. The positive action is when a reduction in the sensor resistance increases the frequency. The circuit is from the book Robotics, Mechatronics and Artificial Intelligence by Newton C. Braga, published in the United States.
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