| This circuit was originally designed to control the brightness of an electric torchlight, but may find many other applications because o...
| This circuit was originally designed to control the brightness of an electric torchlight, but may find many other applications because o...
| Button or coin cells that appear to be flat in their normal function may yet be discharged further. This is because in many cases, for i...
| The alarm circuit uses infra-red light beams to bridge distances between 3 m and 5 m (10 ft to 16 ft), but if the transmit diode is give...
| Simple triangle-wave generators have a weakness in that the waveform of their output signal normally cannot be modified. The circuit pre...
| Digital systems need an interface to communicate with the outside world. Since only voltage drops can be used by the hardware, auxiliary...
| Designs that produce sound or light effects are always sure to appeal to a large audience. That is not surprising in itself, because t...
| A simple switching clock which keeps one light on in the evening hours when you are not at home is no Ionger taken seriously as a burg...
| This running light circuit drives a matrix consisting of 8 up to 32 LEDs, and is primarily intended for playful and decorative application...
| A flash tube control circuit is described wh ich is suitable for playful as weil as serious applications. The unit has a flash frequency o...
| When a battery is charged by a solar panel during the day, it may discharge via that panel after sunset. This may, of course, be prevente...