More about battery (485)

1-07-2006 | It is not generally known that it is possible to ascertain the extent of charge of a battery with a standard digital voltmeter. It does not...

1-07-2006 | The circuit described here is eminently suitable to indicate the capacity of a battery. We use a cheap electric clock for this. By connectin...

1-04-2006 | Occasionally there is the need to charge a battery from a laptop, mobile phone or PMR handheld using an ordinary laboratory power supply. It...

1-12-2005 | This article shows a simple circuit for slow charging while preventing any risk of overloading the battery. The circuit consists of just fou...

1-10-2005 | The TIRIS family of RFIDs from Texas Instruments can be found in many consumer applications ranging from vehicle security to logging maratho...

1-07-2005 | After buying a number of DECT telephones, we noticed that these became quite warm while charging. That surprised us, because the manufacture...

1-07-2005 | This circuit was designed to ‘baby-sit’ SLA (sealed lead-acid or ‘gel’) batteries using freely available solar power. SLA batteries suffer f...

1-07-2005 | This small but very effective circuit protects a lead-acid battery (12-V solar battery or car battery) against overcharging by a solar modul...

1-07-2005 | Professional (directional) microphones often require a phantom supply of 48 V. This is fed via the signal lines to the microphone and has to...

1-05-2005 | This circuit was originally designed to power a motorcycle intercom from the vehicle supply system.