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POSITIVE-DIODE CLAMPERS - 14181_177
POSITIVE-DIODE CLAMPERS - 14181_179

Neets Module 09-Introduction to Wave-Generators and Wave-Shaping Circuits
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4-20 Figure 4-18A.—Positive damper and waveform. Figure 4-18B.—Positive damper and waveform. At T0 the - 25 volt input signal appears across R1 and D1 (the capacitor is a short at the first instant). The initial voltage across R1 and D1 causes a voltage spike in the output. Because the charge time of C1 through D1 is almost instantaneous, the duration of the pulse is so short that it has only a negligible effect on the output. The - 25 volts across D1 makes the cathode negative with respect to the anode and the diode conducts heavily. C1 quickly charges through the small resistance of D1. As the voltage across C1 increases, the output voltage decreases at the same rate. The voltage across C1 reaches -25 volts and the output is at 0 volts.






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