When testing the response of many pulse-width-modulated (PWM) systems, there's a need to independently vary a multivibrator's frequency and duty cycle. Such systems include dc motors, ultrasonic ...
Low-frequency voltage-controlled oscillators (VCOs) can be found in clocks, timers, audio synthesizers, and a variety of other applications. The VCO shown in Figure 1 is based on a simple astable ...
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