ࡱ> o@ bjbj p p 6&oo^H8$4HA,H(p4)))+++++++$,RI/+$*c)@)$*$*++B+B+B+$*FV+B+$*+B+6B+x+rx+< P䐓֍j*Rx++,0A,x+/*p/x+ $0/x+H))B+) )S)))++HHd,+HHELECTRONICS - Capacitors 1. Write down 3 combinations of R and C which will give a time constant of 10s. (a) R C (b) R C (c) R C How long would it take for the capacitor in an RC circuit with this time constant to become fully charged? 2. Use Crocodile Clips on your computer to create the timer circuit shown below. EMBED CrocodileClipsCircuit Investigate the way the time that the LED is on changes as you change the value of the capacitor and the value of the resistor above it. Use the table below to record at least 6 different combinations of resistor and capacitor and the time that the LED stays on. EMBED MSWorks.Table.4 Put an ammeter in series with the LED. What is the current through the LED? Answer....................... What resistor value would you need to make the current through the LED approximately 10mA? Answer. More questions overleaf. Jukebox System Design A few years ago the fourth form built jukeboxes. These were coin-in-the-slot moneyboxes which played a tune and flashed lots of lights when you dropped a coin in. About this prep: A system diagram for an electronic circuit (and many other things) consists of input, output and process stages. These can be connected so that a simple system would look like this:  What you have to do: The boxes below represent different parts of the Jukebox system and the arrows the flow of the system. The boxes and arrows are in the right places. Some of the boxes have words missing. You have to fill in the missing words in the right boxes. Here are the words: Music chip, Coin switch, Loudspeaker, Timer, Astable.  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