2.2. The 555 oscillator (2 marks) +Vcc The 555 Timer is a very versatile component, which can be utilised for many tasks

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2 2 The 555 Oscillator 2 Marks Vcc The 555 Timer Is A Very Versatile Component Which Can Be Utilised For Many Tasks 1 (174.65 KiB) Viewed 47 times

2 2 The 555 Oscillator 2 Marks Vcc The 555 Timer Is A Very Versatile Component Which Can Be Utilised For Many Tasks 2 (127.02 KiB) Viewed 47 times

2.2. The 555 oscillator (2 marks) +Vcc The 555 Timer is a very versatile component, which can be utilised for many tasks. The 555 Timer is based around an external RC time constant, which enables the 555 Timer to perform many Oscillation and Timing functions. The Astable Mode of the 555 Timer refers to the timer having no-stable (astable) output states. Thus, in the astable mode, the 555 Timer output continually oscillates in state (i.e. never stable). 555 (4) (8) RI RESET V cc (7) DISCH (6) (3) w R2 THRESH OUT o (2) (5) TRIG CONT GND You will need to design a 1Hz clock circuit based on a 555 timer. The 555 astable clock circuit is shown in the following figure. R1, R2 and C, are designed to achieve a specified frequency of oscillation and duty cycle. (1) 0.01 uF (decoupling optional) 5

> [R2.2.1] (0.4 mark) Given C; to be 10 uF, using the formula learned in the lecture to determine the other components’ nearest preferred values of the real devices in the lab room to achieve a 1 Hz oscillation frequency with a duty cycle of 75%. [R2.2.2] (0.4 mark) Using the above nearest preferred values, calculate the corresponding oscillation frequency and duty cycle, which should be close (<10% error) to the expected value of 1 Hz and 75% duty cycle. (Show your calculation steps in the report) [R2.2.3] (0.3 mark) Simulate the oscillation circuit with the above preferred values in CircuitLab, report the circuit diagram and the waveforms of OUT and TRIG in the same graph with same scales and zero offsets. (Vcc=5 V) [R2.2.4] (0.5 mark) Construct the circuit on breadboard. Report the waveforms of OUT and TRIG using oscilloscope in the same graph with same scales and zero offsets.