This study is made possible by the availability of a motor potentiometer from All Electronics at small cost. The item is catalog number MPOT-10K, and costs $4. 00. It is manufactured by Alps, and the motor is marked MD157320, the body 725t 10BX2. The potentiometer is dual 10k, so one potentiometer can be used for feedback of the position, while the
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other serves as the output. What we are going to do here is to make a remote-controlled potentiometer that repeats the setting of the control potentiometer. This is a typical feedback system, but since it involves a mechanical element, it is called aservomechanism, orservo, for short. The output could be the shaft position, as well as the electrical output of the controlled potentiometer. In fact, the output of most servos is mechanical. The motor pot consists of a small DC motor, gearing that drives the sliders, the support for the potentiometer resistances, and a shaft. The connections are shown at the right. We are looking at the motor end; the shaft is at the other end. It is slightly disappointing that the potentiometers are Siamese twins, so they are not completely independent, but that is little matter for our purposes. A clockwise rotation of the shaft, looking from the shaft end, increases the resistance between the common end and the sliders. A voltage applied to the motor terminals with the marked polarity turns the shaft anticlockwise, bringing the sliders toward the common ends. The motor requires a little more than 2 V to begin turning, so that 5 V is a reasonable maximum. The motor draws about 30 mA or a bit more. There are two connection pins (not shown) on the shaft side of the potentiometer connections that light a red LED that shines through the hole in the shaft. As you face the shaft, the anode is at...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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