Elektor Team (9512)

1-07-1983 | IKi anti burgaar Iights Burglars are often grateful for the fact that someone goes on holiday for a couple of weeks and leaves the home unte...

1-07-1983 | 40 A. Scragg mains wiring tester Here we have yet snother simple cir- cuit, consisting of two neon lamps (with built in series resistors) a...

1-07-1983 | 41 very narrow crystal filter Good filters can be expensive and a manufactured one with a band-pass characteristic as good as the circuit de...

1-07-1983 | 42 P. von Berg The output of Nl wilt be logic 1 if a signal between 750. 850 Hz is applied to the inputs of the tone decoders. As long as th...

1-07-1983 | r july/august 1983 43 1~ B. Darnton horse paces simulator In horse riding it is very important to know exactly what the horse is doing with...

1-07-1983 | video pattern generator Focussing by eye is possibly accept- able with a B/W set but the resultant pattern will be an egg-shaped "circle". T...

1-07-1983 | lektor july/august 1983 45 car lights warning device L.1 Anyone who has ever forgotten to switch the car lights off, after having driven in...

1-07-1983 | ri code-lock with door opener Anyone who has ever locked him or herself out with the frontdoor key inside will appreciate the electronic doo...

1-07-1983 | 47 DC-DC converter A. Bovee When using a digital measuring instrument with another electronic circuit jt is often necessary or desir- able t...

1-07-1983 | darkroom light it to say that normal lights cannot be used in a darkroom when photo- graphs are being developed — not even if you drop you...