| elektor july/august 1985 A bicycle or tricycle should, as everyone knows, be fitted with front and rear lights. The noteworthy aspect of the...
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| Even in this era of programmable, polyphonic synthesizers, interest in simple, monophonic keyboard instruments remains. Many FORM- ANT owner...
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| Infra-red light barriers enjoy great popularity as timing devices at sports venues, as detectors in alarm instal- lations, as optoelectronic...
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| It is sometimes required in certain cir- cuits that are powered from just one battery to derive a negative supply voltage from the positive...
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| This little unit may be used to give an audible alarm when, for instance, a washing machine hose has burst, or when it starts to rain so you...
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| In contrast to the other metal detector in this issue, the present one works on the principle that the frequency of an LC oscillator changes...
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| a delayed trigger pulse or an .external trigger input. None the less, the com- parator remains an almost indispens- able aid in the testing...
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| An appreciable part of short-wave radio traffic takes place via morse and radio teletype transmission. To ensure optimum reception of these...
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| elektor july/august 1985 1110111B.111 moitigie Which amateur film maker has not wished sometime that he could experiment with time exposures...
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| All types of operational amplifier can be functionally checked with the tes- ter proposed here. The principle of the tester is quite simple:...