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OSCILLATOR_ADJUSTABLE_OVER_10_1_RANGE

2016-08-05 17:12  
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OSCILLATOR_ADJUSTABLE_OVER_10_1_RANGE
In this circuit, there are two feedback paths around an op amp. One is positive dc feedback which forms a Schmitt trigger. The other is a CR timing network. Imagine that the output voltage is +10V. The voltage at the noninverting terminal is +15V. The voltage at the inverting terminal is a rising voltage with a time constant of CTRT. When this voltage exceeds + 5V, the op amp's output will go low and the Schmitt trigger action will make it snap into its negative state. Now the output is - 10 V and the voltage at the inverting terminal falls with the time constant as before. By changing this time constant with a variable resistor, a variable frequency oscillation may be produced.