Elektor Team (9511)

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...

1-07-1984 | PE july/august 1984 for variable power supplies Most mains power supplies nowadays make use of a voltage regulator IC. These circuits un- do...

1-07-1984 | prevents multiple entries This electronic key-set, although similar to its mechanical counterpart (switching, interlocking, reciprocal relea...

1-07-1984 | switches up to 1750 VA Motorola ICs 3040 and 3041 enable the construction of a simple elec- tronic relay that in spite of its simplicity has...