This is the simple version of a white LED lamp that can be directly powered from mains. It can give ample light even for reading purpose. Capacitor Cx along with diodes D1 through D4 forms the AC step ...

This circuit, designed on request, has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, ...

Trump pulls US from 31 bodies in UN, already in fiscal peril Common food preservatives linked to cancer and type 2 diabetes US trade deficit unexpectedly falls to lowest level since 2009 Trump: ...