From the previous experiment (Astable Multivibrator) circuit connecting signal diode 1N4148 across resistor Rb as the circuit shown in Figure 11. Using an oscilloscope, measure the " on " period and the " off " period. Determine the duty cycle and frequency and compare the results to the calculated values (in PRELIMINARY REPORT). Monitor the Vc ( voltage across C) wave form compare with output wave form. And observe how LED display.