- 2 3 1 Monostable The 555 Or 556 Timer Ics Can Be Used With A Few Simple Components To Build A Monostable Circuit Modif 1 (177.99 KiB) Viewed 24 times
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2.3.1. Monostable The 555 or 556 timer ICs can be used with a few simple components to build a monostable circuit. Modify the circuit on your breadboard to build the following circuit with R1 = 470 k 2 and C1 = 10 pF. Refer to the datasheets/EEE Factsheets to check the correct orientation of the LED. Do use the LED current limiting resistor that you calculated in Section 2.2.1. Do only use the normal red LEDs instead of the high intensity LEDs. Note that you will be able to re-use parts of this circuit for the subsequent parts of the practical. It 1 MO will also be easier to debug and less prone to mistakes if you keep it neat. We will use 9.0 V as the supply voltage. If you are using a battery, do check Output1 R the battery voltage is at least 7V with your Trigger1 multimeter. Voo Discharge 1 Reset1 Threshold1 Control 1 Ground -100 nF Remaing the Push the button and explore the behaviour of the circuit. SW, What happens if you push the button when LED is Figure 2-4 Monostable Configuration off? LED turns on What happens if you push the button when the LED is on? Same (LED is In the simulation, we know that the high pulse width is depending on R1 and C1. To test this in your circuit, connect your circuit to the oscilloscope and observe the wave forms. Connect Channel1 to Trigger1 and connect Channel2 to Output1. Push the button and measure the output high pulse width after releasing the button. Tn = Draw the waveforms on the DSO in the blank box below, labelling the voltages and times. Draw waveform