Elektor Team (9531)

1-07-1989 | *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...

1-07-1989 | 063 GENERAL INTEREST MAINS FAILURE INDICATOR When the mains voltage is present at the input terminals, the transistor in the optocoupler is...

1-07-1989 | • 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...

1-07-1989 | 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...

1-07-1989 | 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...

1-06-1989 | 14 INTERMEDIATE PROJECT A series of projects for the not-so-experienced constructor. Although each article will describe in detail the opera...

1-06-1989 | 20 CMOS SWITCHES FOR AUDIO APPLICATIONS T. Giffard When about ten years ago the first analogue CMOS switches and multiplexers reached the au...

1-06-1989 | 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-...

1-06-1989 | 111 PRACTICAL FILTER DESIGN PART 6 by H. Baggott In this sixth part in the series we start our discourse of the tables and characteristics o...

1-06-1989 | 34 UNIVERSAL MIDI KEYBOARD INTERFACE by D. Doepfer The feature par excellence of the MIDI-compatible keyboard controller described in this a...