All items tagged with time and technology (303)

1-07-1992 | When an appliance ceases to operate, there may be various causes for this, one of which isthe blowing ofthe mains fuse. The monitor prop...

1-07-1992 | Any push-button switch can be used as a bounce-free, change-over switch with the aid of two D-type bistables contained in a 74HCT74 and...

1-07-1992 | The scanner is an extension for the 'AlI-solid-state preamplifier' published tn the December 1989 / January 1990 issues of this magazine....

1-07-1992 | From time to time one comes across appliances in second-hand goods stores that were designed for operation from a 110 V a.c. (50/60 Hz)...

1-07-1992 | Although a 9.5-24 V direct voltage can be brought down to 5 V easily by a standard regulator, the converter described here has the advant...

1-07-1992 | The sidac from Motorola is best compared with a triac of which the gate connection is missing. lt switches on whenever the voltage across...

1-07-1992 | The Smartec Type SMTl60-30- 18 is a temperature sensor with a digital output, and housed in a TO-18 case. Pins 1 and 3 are are the suppIy...

1-04-1992 | Many is the time when a strange, unexpected or distorted waveform appears on your oscilloscope screen. A lot of head scratching and book...

1-03-1992 | Many people nowadays do a lot of cooking in their wok, usually on agos or electric stove, but the idea outlined below, which I have been u...

1-12-1991 | The power supply for this analogue circuit that affords delays of 330 seconds is taken directly from the mains. The direct voltage at the...