| Five LEDs are connected to a 9V battery by means of two series resistors are all you need to build this nice-looking Christmas star. The cir...
All items tagged with Battery and LED (16)
| You occasionally see advertising signs in shops with a blinking LED that seems to blink forever while operating from a single battery cell....
| A miniaturized wireless battery-charging chipset from STMicroelectronics saves space, simplifies enclosure design and sealing, and accelerat...
| A key issue with lithium ion batteries is aging. It significantly reduces their potential storage capacity. To date, very little is known ab...
| The author’s rechargeable battery collection comprises a large number of cells of various types, ages and states. Surely he cannot be the on...
| Elektor September 2007 comes with a board containing an LED booster circuit which you can try out for yourself. Although tiny, the board con...
| Lead-acid batteries still form an essential part of the on-board power systems in cars, motorcycles, boats and caravans. In its new form, fe...
| In many small battery powered apparatus it is common to have an LED act as a combined indicator for ‘power-on’ and ‘battery state’. The most...
| Yuasa, Kobe, Sonnenschein and Varta are but a few of countless manufacturers of sealed lead-acid (SLA) batteries. Although these b...
| How many different conditions do you reckon may be signalled with just one LED? Two, maybe three? Using this simple circuit, a lot more!