| In some countries, the water supply is irregular at most times: in many other countrie at times of a drought. A means of making this less...
All items tagged with mechanical and Circuit (3)
| Most householders these days employ timeswitches to control their central heating systems. Many of these switches, however, are of the mec...
| Any switch or key in a digital circuit may cause problems because mechanical contacts bounce up and down a few times before they close. N...