Elektor Team (9531)

1-07-1986 | 1 0-0 5V EE July/August 1986 58 33heart beat monitor C1 820n R4 D2 R6 R15 CA3130 4 1 C2 F 10n C3 l 820n 8 IC4 0000 D2...D5 = 1 N4148 R12 JjA...

1-07-1986 | Musical instruments are tuned with the aid of a signal source that generates a signal at a frequency of 440 kHz. An electronic tuning fork i...

1-07-1986 | EE 60 July/August 1986 135 Many direct-current monitor circuits use a resistor in series with the current-carrying wires, and actuate some i...

1-07-1986 | 361car fuse monitor This extremely simple to construct contrivance offers motorists a visible indication as to the nature of malfunc- tions...

1-07-1986 | This protective circuit is readily in- corporated in battery-powered equipment which is typically in- tended to operate for less than about...

1-07-1986 | EE July/August 1986 62 38 filtered connector Computers and computer-driven peripherals are notorious sources of RF interference, and receive...

1-07-1986 | 139 Unfortunately, we are all well aware that the annual holiday season is an anxious time for many people, since they worry about leaving t...

1-07-1986 | Obtaining TV synchronization pulses from a composite video signal gener- ally presents few problems, as can be concluded from the relative s...

1-07-1986 | 41 The objective of this circuit is to obtain a synthesizer-controlled equivalent sound as produced by such metal indefinite pitch per- cuss...

1-07-1986 | A1 ,A2 = IC1 = LM393 51 on/off 9V IC1 IC2 IC3 00 A telephone has the unfortunate dis- 2 advantage that you have to be near it to be able to...