All items tagged with time and technology (303)

1-07-1994 | An ideal power supply maintains its e.m.f., irrespective of whether it is providing current or sinking it. The present supply approaches...

1-07-1994 | Many guitarists still swear by the good old valve amplifier. It is fact that valve amplifiers produce a sound different frorn that of a...

1-07-1994 | A part from use as a standard charger, the present unit may also be used for continuous trickle charging to keep a 12 V lead-acid battery...

1-07-1994 | Soldering is an unhealthy activity: when the tin melts it releases harmful vapours. lt is, therefore, advisable, to install a small 12 V...

1-07-1994 | When a three-phase mo-tor is being installed, it is essential to know the sequence of phases R, Y and B, since an error may have disastro...

1-07-1994 | Reversal of the supply lines to a circuit normally has disastrous consequences. The protection described here can prevent such a disaste...

1-07-1994 | Electric points of a model railway system contain two small magnets. To set the potnts ina gtven position, one ofthese magnets must be e...

1-07-1994 | Quartz crystals are ground by the manufacturers to oscillate either on the fundamental frequency or on one of the odd harmonics (overton...

1-07-1994 | It is not two well-known that If the characteristics of the two transistors making up a multivibrator are near-identical, it is very dif...

1-07-1994 | Occasionally, an ideal fullwave rectifier is required, for example inadynamie compressor where switching thresholds and non-linear behav...