This circuit is an oscillator that generates a square wave. The op-amp starts with its two inputs in an unknown state; say it starts with + slightly above -. The op-amp greatly amplifies this difference, driving its output to the positive op-amp supply voltage, its maximum output (15 V in this case). The two 100 kΩ resistors act as a voltage divider that places the + input at half the output voltage, or 7.5 V. The - input is at ground, lower than the + input, so the op-amp's output stays at 15 V. Current flows from the op-amp's output to ground through the capacitor, charging it. As soon as it charges to just over 7.5 V, the - input is now higher than +, and so the output switches to -15 V. This drives the + input to -7.5 V. Now current flows in the other direction, discharging the capacitor and reversing its polarity, until it reaches -7.5 V. Then the cycle repeats. To hear the signal, increase the simulation speed and press the Play button.
This page is a utility for simulating генератор сигналов online with specified initial values.
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