Elektor Team (9517)

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...

1-07-1984 | july/august 1984 . . . uses LEDs We present a new game that might be described as a sort of electronic one-armed bandit. The good news is, h...

1-07-1984 | audio interrupter The stereo is on, playing loud enough to do justice to your favourite rock record. The doorbell rings but in your ecstacy...

1-07-1984 | a class AB design for 4 Q or 8 Q loads This is an amplifier with a very simple layout that none the less pro- duces quite a high power. Powe...

1-07-1984 | with just six transistors To the best of our knowlegde this is the simplest FM radio that can be made. Not only that but it also works quite...