Electronics guide > Capacitors

You need a number of components to build the circuits in this chapter:

  • 1 x 15 k resistor
  • 1 x 22 μF electrolytic capacitor
  • 1 x 220 μF electrolytic capacitor
  • 1 x 470 μF electrolytic capacitor
  • 1 x switch

As usual, the resistor power rating and tolerance are of no importance. The capacitor must, however, have a voltage rating of 10 V or more. The switch can be of any type, even an old light switch will do if you have one. A slide switch is ideal, however, both common and cheap.

To make the connections between the switch and your breadboard, you can use common multi-strand wire if you like, and tin the ends which push into the breadboard Ч see last chapter for instructions Ч but a better idea is to use 22 SWG single-strand tinned copper wire. This is quite rigid and pushes easily into the breadboard connectors without breaking up. ItТs available in reels, and a reel will last you quite a while, so itТs worth buying for this and future purposes.

Take note

If short strands break off from multi-strand wire and get stuck in the breadboard connectors you might get short circuits occurring. Make sure Ч if you use multi-strand wire Ч you tin wire ends properly. Even better Ч donТt use multi-strand wire, instead use single-strand wire.

Solder a couple of short lengths of the wire to switch connections and push on a couple of bits of insulating covering (you can buy this in reels also, but if you have a few inches of spare mains cable youТll find you can strip the few centimetres you need from this) to protect against short circuits.

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