| A tilt sensor is a very versatile device: for example, it can be used as a (game) controller or as an alarm sensor to protect valuables. The...
More about Circuit (708)
| PP3-size 9 V batteries (IEC: 6LR22) have a considerably poorer price/energy ratio than 1.5 V AA (IEC: LR6) cells. This makes it all the more...
| This circuit can be made to produce interesting and attractive light effects using just a cluster of red LEDs and one of green LEDs. One eff...
| Anyone who's spent much time searching the web for interesting circuits is likely to have found at least one TL431 based audio amplifier...
| In some circumstances it may be necessary to select LEDs with closely matched characteristics. This design makes the job a whole lot easier....
| This circuit was designed for monitoring the charge- and discharge process of a 6-V lead-acid battery. This process takes place between 6.2 ...
| Crystal filters are often used for IF filters in receivers, where the bandwidth of this filter largely determines the selectivity of the rec...
| This is a design for a rear bicycle light that automatically switches on and off according to ambient lighting conditions. The red LEDs flas...
| On a sailboat, the condition of the battery is a major concern for obvious reasons. On the author’s boat, a 120 Ah lead-acid battery is char...
| Most hobbyists will have some tools that are battery-powered, such as a drill, screwdriver or power scissors. Unfortunately (and especially...