| Here’s a rather special voltmeter that will let you measure the AC grid voltage and also see very accurately how it fluctuates around its no...
All items tagged with Power and Circuit (49)
| Many appliances these days are switched on and off with the simple push of a 'soft' on/off button. In the 'off' position the...
| Most hobbyists will have some tools that are battery-powered, such as a drill, screwdriver or power scissors. Unfortunately (and especially...
| The AC powerline indicator presented here has a complete galvanic isolation from the grid. The indicator is an LED that lights up when a cur...
| When a switched multiway is used to power a PC, printer, scanner, modem, and so on, all these devices often stay powered, in stand-by, simpl...
| Although the acronym ‘LED’ has stood for ‘light-emitting diode’ since the 1960’s, LEDs have only recently started to emit significant amount...
| The LM4050 from National Semiconductor is a high precision micropower shunt voltage reference in a sub-miniature, surface-mount, three pin,...
| The voltage step-up converter described in this article is a transformerless design based on just one integrated circuit and a handful of...
| This circuit was originally designed to control the brightness of an electric torchlight, but may find many other applications because o...
| The circuit described in this article is primarily intended for installing into a PC, to act as a versatile supply for all kinds of experi...