More about power supplies (359)

1-07-1978 | This DC power supply, whose output voltage can be modulated by an audio-frequency or other LF signal, is intended for such applications...

1-03-1978 | Although this power supply is primarily intended for use with the SC/MP system, its general-purpose design renders it suitable for other mi...

1-07-1977 | A drawback of conventional integrator cir- cuits (figure a) is that the R-C junction is at virtual earth; this means that C appea...

1-02-1977 | Three terminal, IC, fixed voltage regulators are now commonplace, and most readers will be familiar with the LM309 and similar device...

1-07-1976 | Mechanical lap counters for m de! racetracks have a repu- tation for unreliability. They either suffer from poor contacts, or the mech...

1-03-1976 | Most tuners with varicap front-ends require two supply voltages. One for the front-end and i.f. amplifier {usually about +12 V) and a t...

1-07-1975 | Many different methods are followed to generate mains synchronised pulses. This circuit employs an opto-coupler to give complete isolatio...

1-07-1975 | Many pocket calculators have a constant factor memory. If a 1 is stored in this memory, depressing the t key adds l to the number al...

1-07-1975 | Many amplifier designs, both do-it- yourself efforts and commercial cir- cuits, have the bad habit of delivering a more or less hefty switc...