| The Type NH-3 humidity sensor used in the ‘automatic air humidifier’ (July/August 1998) may be replaced by a lightdependent resistor, LD...
H. Bonekamp (119)
| The input impedance of a.c.-coupled op amp circuits depends almost entirely on the resistance that sets the d.c. operating point. If CMO...
| A photo-diode is a p-n diode whose reverse current depends on the amount of light falling on its junction. The reverse current is greatl...
| The current source in the diagram, which react very fast to changes in the input signal, may be used, for instance, in certain measureme...
| The consumer unit (or ‘electricity meter’) cupboard in some older houses is a badly lit place. If the bell transformer is also located i...
| Over the years this magazine has published a variety of light dimmers. Invariably, these were designs based on discrete components. Th...
| When construction of the barometer/altimeter, which is based on a precision airpressure sensor with integral signal processor from Mo...
| It is just about ten years ago that this magazine published the design of a barometer/altimeter. In these ten years electronics techno...
| This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingd...
| This is an electronic equivalent of the traditional builder’s spiritlevel using a small glass tube nearly filled with alcohol but contai...