The circuit shown in figure 1 can detect the circulation of alternating currents in electrical installations from values as low as 300 mA without the need for contact. The circuit can also be adapted to be used as shield for microcontrollers.
The circuit shown in figure 1 can be used both to detect earthquakes and vibrations of foundations and the soil itself during the operation of heavy industrial machinery and equipment. An important application would be in assessing the degree of vibrations transmitted by maladjusted or poorly fixed machines that could cause long-term damage to the structure of the buildings and in which they function.
Lead-Acid Batteries are used as an alternative source of power and even main source in many industrial equipment and other applications. The monitoring of the state of such a battery can be done with the aid of a simple circuit which makes use of LEDs, as shown in figure 1.
A battery charger is nothing more than a constant current source connected in series with the battery you want to charge. Nicad small batteries have load currents of 15 mA to 45 mA, depending on the size and type. In most of them, indications of charge current and time are recorded in the enclosure itself. The circuit shown in Figure 1 is a constant current source which serves precisely for this purpose.
A system, based on a piezoelectric transducer, can generate enough power to power a small wireless sensor system. This article is from 2007.
Response speed, sensitivity and immunity to external factors, such as pollution, are some of the characteristics of Hall sensors that make them ideal for critical applications. Learn in this article the TLE 4921-3U.
This circuit uses a sensitive reed relay to control external loads. The time delay is given by the...
This circuit was found in an old publication about transistor. The original trasistors are...
This conventional astable uses two NPN transistor and was found in a publication of the year 1968. The...
This basic configuration of an astable multivibrator was found in a publication of the year 1968....
This oscillator can run in frequencies up 10 MHz depending on the Power supply voltage. The 1 µF...
This one-digit counter is part f the samples bench of the MultiSIM in one of its versions. The...
This simple timer can be used in many applications such as egg timer. The LED glows up when S1 is...
The circuit shown by the figure below can produce signals in the range between 20 kHz and 30 kHz....