Elektor Team (9512)

1-07-1985 | In circuits where two signal paths must be electrically isolated, use is often made of an opto-coupler. Unfor- tunately, these devices requi...

1-07-1985 | elektor July/august 1985 The type UAA170 integrated circuit is normally used to drive up to sixteen LEDs, and the present circuit is no exce...

1-07-1985 | electronic dog To produce a faithful reproduction of the voice of man"s best friend, we have borrowed several ideas from our music synthesiz...

1-07-1985 | elektor July/august 1985 Microphones, unfortunately, produce onlyasmallsignalandthey,therefore, require a special pre-amplifier to boost the...

1-07-1985 | elektor july/august 1985 L. __ — —.J Most burglar deterrent systems are based on the same principle: once the presence of an unwanted or...

1-07-1985 | siren Agsrimi In spite of its modest configuration, the circuit shown here is capable of generating quite a sound. This is made possible by...

1-07-1985 | Water and gas pipes, as well as elec- trical conduit, embedded in walls are not easy to trace, although this is essential when work is to be...

1-07-1985 | If you still alter your central heating system"s boiler thermostat according to the season (many people nowadays leave it at the same — fa...

1-07-1985 | The LM35 is a temperature sensor which provides an output voltage that is directly proportional to the tempera- ture being measured in degre...

1-07-1985 | capacitor itself is charged to about 12 V. Diode D3 is then reverse biased, but D4conducts, so that C4 is charged to just over 20 V, which i...