| 060 SENSOR SWITCH AND CLOCK One Type TL084 lc and an old quartz watch enable the con- struction of a de luxe on-off switch. Two of the four...
Elektor Team (9503)
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| 18V 8A LM317 LM317 BC547 04. C5 1N4001 B1 10A * see text C1 = C2 Nom 2 47009 35V ELEKTOR ELECTRONICS JULY 1989 SUPPLEMENT 5W The circuit des...
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| *see text 5x iN4148 062 RADIO & TV Amateur VHF relay stations are normally actuated by a 1750 Hz call tone. This may give problems when the...
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| 063 GENERAL INTEREST MAINS FAILURE INDICATOR When the mains voltage is present at the input terminals, the transistor in the optocoupler is...
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| • am U 064 ELECTROPHONICS The control of this compressor is based on the dependence of the dynamic resistance of a diode on the current fl...
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| C Z 70n R2 U D1 02 LT V I 180n •• 470 p H 065 TEST & MEASUREMENT =Ma 560p 6n8 =On C4 5 270n 1I0In LC SINE WAVE GENERATOR R33c1 100nH...1...
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| The current range in multimeters, par- ticularly the more inexpensive ones, is restricted by the load limits of the internal shunts to 1-2 A...
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| 14 INTERMEDIATE PROJECT A series of projects for the not-so-experienced constructor. Although each article will describe in detail the opera...
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| 20 CMOS SWITCHES FOR AUDIO APPLICATIONS T. Giffard When about ten years ago the first analogue CMOS switches and multiplexers reached the au...
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| 24 TEST AND MEASUREMENT 8-DIGIT FREQUENCY METER by T. Giffard A state-of-the-art frequency meter module is presented that has an 8-digit, 7-...