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1-12-1990 | Most small portable radios require a 3 V supply normally provided by two size AA or AAA batteries. Since rechargeable batteries are an op...

1-10-1990 | Following last month's introduction into the main characteristics ot the Super-VHS system, we close off the article with details ot a prac...

1-10-1990 | Here is an all-purpose d.c. power supply tor symmetrical as well as asymmetrical use, and capable ot supplying high output currents and vo...

1-09-1990 | The TDA1522 from Philips Components is a preamplifier chip for tape and cassette recorders. The circuit presented here is remarkable for...

1-07-1990 | The design of this meter is in direct response to the intention of most electricity generating boards in Europe of standardizing on a mai...

1-07-1990 | This circuit enables the automatie on/off switching of mains-powered equipment after a master unit has been switched on or off. One parti...

1-04-1990 | Among the main electrical properties of an inductor are its self-inductance, its quality (Q) factor and its self-resonance frequency. An in...

1-04-1990 | It is an undeniable fact that electric and magnetic fields affect living organisms. How strong a field the human body can withstand withou...

1-02-1990 | In order to simplify the transmitter and to improve the noise immunity of the remote control receivers described in his earlier article, M...

1-07-1989 | 056 MAINS POWERED TIMER This timer may be inserted in a power line to provide a controllable delay before a load is energized. It was develo...