NOTE: Task sheet attached
You have not been working long in a small Electronic Engineering business when your
boss (an engineer in his own right) hands you two sheets of paper each with a circuit
roughly sketched on it, tasking you with building, testing and checking their
functionality. The first circuit has a power supply regulator function for you to confirm
with measurements, and the second is a sequencer for output to some automation
Build both circuits and do the tests required, as follows:
Task 1 ~
For circuit (1) –
You have been told that this circuit is to be for a power supply that has a variable output
range that should include 5V – 12V at an output maximum load current of 200mA.
Do some circuit analysis calculations to check the design first and make any
adjustments to values you deem necessary.
Next, build and test the circuit, taking measurments to confirm its performance.
Record d.c. voltage measurements at points A and output Vo for the extreme
settings of the potentiometer, and then using the a.c. range on your multimeter
take measurements again at A and Vo (also for both extreme settings). Do these
tests with an output load current of about 50mA and again at about 200mA.
Tabulate your results.
Summarise the performance, observations and recommendations into a short
report. The recommendations should include suggestions for improvements.
Task 2 ~
For circuit (2) –
You have been informed that the sequencer circuit requires verification. To do this you
Study the datasheet for the 4017 IC (and the datasheet for the LM555)
Do some preliminary calculations to verify the LED drive circuit and the timer
(555) circuit. Determine that there is sufficient current to light the LED when on
and calculate the timing information for the timer (555) circuit.
Briefly explain the operation of the circuit
Build the circuit and once checked, connect to a 9V power source (either the PSU
circuit from Task 1 or a 9V battery)
By monitoring the d.c. voltage at point A on circuit 2 and noting the changes in
voltage, count the changes over a 20sec interval to determine the timing from the
timer. Record your observations and results.
Investigate that the two switches behave correctly (simulate switches by using
Record the timing sequence and periods for the LED at the output (B).
Describe step by step the operation of the circuit and comment on the
performance, and any observations and recommendations into a short report.
For both tasks the reports should be not more than an A4 page each for the calculations,
tabulated results, observations, circuit operation and performance explanations, and
In addition to the written part also include for Task 1 a pic showing your built circuit
under test depicting clearly a relevant measurement that appears in your results and forTask 2 a short 20 s clip showing your circuit operating under the test conditions
(including switch options) and including your voice-over explaining things. A Marking
criteria sheet will be put up on the StudyDesk shortly.
Submission via StudyDesk will be by a single pdf file. [ A freeware pdf creator like Foxit
can embed video].
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