Elektor Team (9517)

1-07-1989 | 046 HCMOS SQUARE WAVE GENERATOR This pulse generator supplies three rectangular output signals with a duty factor of 0.5. The signals have a...

1-07-1989 | 047 HIGH-POWER ZENER DIODE Although its regulation characteristics are not as good as those of an integrated voltage regulator, a high-power...

1-07-1989 | TEST & MEASUREMENT 048 VOLTAGE-CONTROLLED OSCILLATOR A1,A2 = 1C2 = TL072 N1...N4 =1C3 = 4071 T 00® T On e5V 894100 • 11 The voltage-contr...

1-07-1989 | COMPUTERS 049 MONITORING TEMPERATURE WITH THE C64 Maplin"s module Type FE33L provides an inexpensive and convenient means of monitoring temp...

1-07-1989 | 050 SIMPLE VARIABLE POWER SUPPLY This low-cost power supply has an output voltage range of 1.5-15 V at a maximum current of 500 mA. Regulati...

1-07-1989 | 051 GENERAL INTEREST D4 11441 48 I S1 15 09 013 1C3 4060 PI 0 5V 0 Bz O R8 680n BC547B 11•111•11 894071 - 11 DL TOnTOOR 16V 03 Re1 1N414...

1-07-1989 | 052 IMPROVED LOW FUEL INDICATOR The indicator described here obviates the flickering of the "low fuel" warning light on the dashboard caused...

1-07-1989 | 053 AUDIO & HI-FI A vox is a voice-operated switch that is often used as a substi- tute for the press-to-talk switch on a microphone. The on...

1-07-1989 | 054 LOW-NOISE MICROPHONE PREAMPLIFIER The microphone preamplifier described is based on the SSM2015 from Precision Monolithics Inc. (Pmi), w...

1-07-1989 | 055 HIGH-VOLUME ALARM When this alarm is actuated by a low-level signal at input W, the (FiF) loudspeaker produces a number of 4-tone sequen...