| This simple circuit enables you to listen to your heartbeat, for instance, while you are exercising.
Peter Lay (24)
| Pedestrians run grave dangers when, in badly-lit areas, they cross a road at night in dark clothing, because this means that car drivers...
| In electronics, there is often a requirement for a generator that provides variable-width pulses. Examples abound: stair lighting; time/...
| Valuable items are best protected against theft by a customized alarm system. The protection system described here can not only protect...