This is Simple non-contact voltage tester using transistors next one circuit that use all transistor as main,it is cheap and easily build. Which many friends likeNon contact AC Detector Voltage. It use CD4060 as main
We have many ways to indicates an AC line. A good way, the AC mains voltage indicator circuit with a LED. It may be the best choice. It saves and to be easy.
This is Simple monitor turn on delay circuit, by use contact of relay acts as a switch. When entering an AC main to this circuit. The circuit will delay while Reduce the surge current protection with fuse.