Skip to main content

What is potentiometers How a Potentiometer Works?


Potentiometers
A potentiometer is simply a variable resistor that can be controlled by the user. Potentiometers accomplish this by having three terminal resistors forming and a load that connect the potentiometer and the voltage source in one loop and the potentiometer and the load in another. Potentiometers have a wide range of uses, ranging from CD players to Servo mechanisms.

How Does a Potentiometer Work?
A potentiometer has 3 pins. Two terminals (the blue and green) are connected to a resistive element and the third terminal (the black one) is connected to an adjustable wiper. The potentiometer will work as a rheostat (variable resistor) or as a voltage divider.

Rheostat
To use the potentiometer as a rheostat, only two pins are used: one outside pin and the center pin. The position of the wiper determines what quantity resistance the potentiometer is imposing to the circuit, as the figure demonstrates:
If we have a 10kΩ potentiometer, it means that the maximum resistance of the variable resistor is 10kΩ and the minimum is 0Ω. This means that by changing the wiper position, you get a value between 0Ω and 10kΩ.

Voltage Divider
Potentiometers can be used as voltage dividers. To use the potentiometer as a voltage divider, all the 3 pins ar connected. One of the outer pins is connected to the GND, the other to Vcc and the middle pin is the voltage output.
When the potentiometer is employed as a voltage divider, the wiper position determines the output voltage. When you have the potentiometer connected this way, you have the following circuit:
Basically, the voltage divider is employed to show an oversized voltage into a smaller one.
                                        
Potentiometer Taper
One main thought related to potentiometers is that the taper. The taper is the relationship between the position and the resistance of the potentiometer. The most common types are linear and logarithmic tapers.
Linear potentiometers
The most common form is the simple linear taper. In a linear taper, the relationship between the resistance and the potentiometer position is linear. This means that if the knob of the potentiometer is at the medium position, the output voltage is half of the voltage through the potentiometer.
Logarithmic potentiometers
Non-linear tapers are specially used in audio control applications, namely logarithmic tapers (there are also inverse-logarithmic tapers).

Labels:

Comments

Post a Comment

Popular posts from this blog

Different types of Limit Switches

Rotary Geared Limit Switches The operating of the Limit Switch is to prevent the mechanism or drive at the intense forward/reverse positions. The Limit Switches are significantly suited to use on reversing drives like a hoist, winches, rolling mills and various other mechanisms used in steel plants such as coke ovens, feeding machinery, valve drives etc. The contacts of Limit Switches are forty amps rated ceaselessly at 500 Volts A. C. The Limit switch is often supplied with two NC contacts or four NC contacts or (2 NO + two NC) contacts as per the need. For Series Limit Switches are shields are provided. The frequency of switching of each contact is suitable for a maximum of 720 operations per hour. The speed of the driving shaft rotation shouldn't be over 60 rpm. Features:- High durable standards Optimum performance Easy to install Counter Weight Limit Switches A metal structure offers the required stability to Counter Weight Limit Switches that job on heavy c
Post a Comment
Read more

Solid State Relay AC & DC Input Circuit

Solid State Relays are semiconductor equivalents of the mechanical device relay and may be accustomed control electrical masses while not the utilization of moving parts. a normal electro-mechanical relay, SSR’s provide complete electrical isolation between their input and output contacts with its output acting as a conventional electrical switch in that it has very high, almost infinite resistance once nonconductive (open), and a really low resistance once conducting (closed). Solid State Relays can be designed to switch both AC or DC currents by using an SCR, TRIAC, or switching transistor output instead of the usual mechanical normally-open (NO) contacts. Solid State Relay DC Input Circuit When utilizing mechanical contacts, switches, push-catches, other hand-off contacts, and so forth, as the initiating signal, the supply voltage utilized can be equivalent to the SSR's base information voltage esteem, though when utilizing strong state gadgets, for example, trans
Post a Comment
Read more

What is switching regulator? How does a switching regulator work?

switching regulator  A voltage controller that uses a changing component to change the supply into a rotating current, which is then changed over to an alternate voltage utilizing capacitors, inductors, and different components, at that point changed over back to DC. The circuit incorporates guideline and separating parts to safeguard an unfaltering yield. Switching regulators or DC-DC converters are used universally in almost all electronic devices. They are popular as they have high efficiency during both step up (boost converter) and step down (buck converter) of DC voltage. Below may be a simplified diagram of a buck convertor that is used to step down DC voltage. A controller IC is needed to sense the feedback voltage and alter the switching PWM consequently. Some DC-DC converters today replace the diode with a transistor for synchronous rectification for higher efficiency. This efficiency comes at a higher cost as a more complex driver is needed. How does a switch
Post a Comment
Read more