Elektor Team (9517)

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...

1-07-1983 | portable egg timer Packing a rucksack to go camping always poses problems. Either you pack everything exept the kitchen sink and stagger und...

1-07-1983 | 50 frequency comparator In the circuit described here, a refer- ence voltage level is derived from the comparison of the frequencies of two...

1-07-1983 | 9V 9V 1Nl 51 1T3 2 JJ P1 C1 look 10n 14 T C5 "cl 9V op 1C2 cricket simulator 9+ This simulator gives a faithful repro- duction of the chirp...

1-07-1983 | elektor july/august 1983 52 pulse/pulse train generator This circuit has two modes of oper- ation. If the pushbutton is just pressed once a...

1-07-1983 | 53 offset-Iess 4 MKH rectifier In an active rectifier the offset of the op-amp can cause the rectified output voltage to be incorrect. This...