Permachart - Marketing Reference Guide: Schmitt Trigger, Square Wave, Negative Feedback

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Document Summary

Transistors as switches: where signal at base (gate) determines if switch is on or off. Example: converts power at 12 vdc to power at 118 vac. 1: uo = u1, only purpose is buffering. Differential configuration: if u1 is grounded, then u2 sees an inverting configuration, if u2 is grounded, then u1 sees a non-inverting configuration. Schmitt trigger: an op amp alone can be used as comparator but it can chatter. Solution: schmitt trigger can provide hysteresis by positive feedback: input terminals compare two voltages and output is either +14 or 14, depending on which input voltage is higher. Differentiator circuit: r1 dominates impedance of capacitor at f > 5. 0 khz, therefore, c can be neglected so ideal gain is flat r2/r1 without r. Chopper circuit: uses a switch to periodically short a signal to ground. Diode logic circuits: high (logic 1) when input or output voltages 4 5 v, low (logic 0) when voltage 0 1 v permacharts.

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