Search

Differential Resistive Sensor (MEC193E)

This circuit is from in my book Robotics, Mechatronics and Artificial Intelligence (sold out) published in the United States. It shows how to mount a second simple differential resistive sensor. See more about resistive sensors in the article MEC188E. The circuit can be used in mechatronics or robotics projects with microcontrollers or as a building block for simple projects. The circuit shown in Figure 1 operates with two sensors, comparing the resistance of each.

Read more: Differential Resistive Sensor (MEC193E)

Timer (ART450E)

Turning off a device after a certain amount of time is something that many readers would like to do automatically. With the timer described here, this is possible. The circuit shuts off the load and itself after a time interval of up to one hour, set in a potentiometer. With it, you can turn off the TV automatically, even if it sleeps, saving energy and not disturbing the neighbors.

Read more: Timer (ART450E)

Electroscope for physics classes and technical courses (ART448E)

In the technical courses of electronics and in the second grade schools the presence of electric charges in the bodies is studied as part of the Physics denominated Electrostatic. The use of an electroscope for practical experiments is common, but the old version of gold leaf can be replaced with an electronic version. Likewise, static charges are dangerous and may affect the integrity of delicate components, such as CMOS chips widely used in digital logic, computers, microprocessors, etc. A simple means of detecting whether or not an object is charged with static electricity is through the use of an electroscope. A circuit for this purpose is what we described in this article.

Read more: Electroscope for physics classes and technical courses (ART448E)

Metal detector (ART447E)

This metal detector can be used to find small objects lost in lawns or carpets, pipes and metal wires embedded in walls, or to detect weapons and metal objects in boxes and suitcases. The range, like that of all circuits operating according to this principle, depends on the size of the object and can range from a few centimeters for coins and jewelry up to 10 cm for a weapon or a beer can.

Read more: Metal detector (ART447E)

Circuit Bench

MultiSIM Blue