Elektor Team (9517)

1-07-1989 | 056 MAINS POWERED TIMER This timer may be inserted in a power line to provide a controllable delay before a load is energized. It was develo...

1-07-1989 | Cl D1 10n 15n 22n (loon R2 LSLK en 01...03 = 1N4148 BC547 T2 N1...N4 = ICI = 4093 R8 "Cl C8 0W5 R3 R4 00 135 057 SINGLE-CHIP MELODY GENERATO...

1-07-1989 | 058 INFRA-RED MICROPHONE The circuit of this microphone was originally designed to mon- itor a 7-segment display used on the flight deck of...

1-07-1989 | 38 059 FOUR-QUADRANT DIMMER This very special mains-operated dim- mer for domestic or industrial lights is not available in proprietary form...

1-07-1989 | 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...

1-07-1989 | 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...

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...