Elektor Team (9534)

1-07-1984 | based on a current source The 78XX/79XX series voltage regulators have become so typecast in their main application that we tend to forget t...

1-07-1984 | exotic, perhaps, but not esoteric Perhaps it is a longing for nature in our technological society that prompts so many readers" requests for...

1-07-1984 | by opto-electronics It is true, of course, that it has been possible for many years to release a camera shutter remotely. But that is normal...

1-07-1984 | for alarm extension The "alarm extension" described in the September 1983 issue of Elektor, when used with a telephone cannot make a clear d...

1-07-1984 | use 8" drives with a 51/4" interface Someone once said "Small is beautiful" and we wholeheartedly agree with him. In the case of this circui...

1-07-1984 | with digital read-out The circuit presented is not only a suitable replacement of an existing mechanical rev counter, but may also be fitted...

1-07-1984 | july/august 1984 a power-photo transistor The 2N3055, strange though it may seem, can operate very well as.a photo transistor, as the circui...

1-07-1984 | for hibernating batteries. This is a charger designed specially for batteries that are not used for long periods, e.g. those of motor- cycle...

1-07-1984 | provides 1 x 5 V and 3 x 12 V The attraction of this power supply is based on two of its characteristics. First of all it is extremely compa...

1-07-1984 | to thwart would-be housebreakers The disadvantage of almost every available code lock is that some sort of keyboard must be mounted at the d...