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GCSE Coursework C4 - Improvements Made or Needed

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GCSE Coursework:
Intro
A1
A2
A3a
A3b
A4
A5
A6
A7
B1
B2
B3
B4
B5
B6
B7
C1
C2
C3
C4
C5
D1
D2
D3

C4
Carry out or suggest an improvement.
( You also get full marks if no improvement is needed ).
There is a clear statement of how the improvement would or does make the system perform more closely to the intended specification.

If your circuit met the original specification with no problems, you gain these marks. If not ...

Say what was wrong.
How could you fix the problem?
If you managed to fix it, explain how.

Example Work for C4