Potentiometers, often known as pots, are a kind of resistor that is used to regulate the output signal of an electrical device such as a guitar, amplifier, or speaker. They feature a little shaft on top that acts like a knob; as the user twists the shaft, the resistance on the signal increases or decreases. This change in resistance is then utilized to modulate the loudness, gain, or strength of the electrical signal. To install and wire a pot, ground the first terminal, connect the input signal to the third terminal, and then connect the output signal to the terminal in the center. To do this, solder each wire to the correct terminal. Fortunately, if you’ve worked with soldering equipment before, understanding how to wire a potentiometer is a rather simple task.
Selecting and Preparing a Pot
1. Determine the three major terminals that protrude from the center of the pot. Place your pot on a flat surface with the three prongs facing you. These are your access points. Your ground is the first terminal, or terminal 1. The center terminal, or terminal 2, is the pot’s input signal. The output signal is connected to the third terminal, or terminal 3. The top shaft controls a tiny ring connected to the second terminal. By turning it, you may adjust how low or high the input is.
- Consider a potentiometer to be a dimmer switch. Terminal 1 is the ground, terminal 2 is the switch, and terminal 3 is the switch set all the way up.
- A potentiometer is generally often used to alter an input signal by throttling it. A pot may sometimes be used to overclock a device with a stronger signal.
2. Read the resistance figures on your pot to determine the range you can reach. Pots are seldom used to regulate signals higher than a few volts, yet the amount of resistance they give is significant. The greater the range, the more your control over your gadget. The number on the front of the pot indicates the pot’s maximum degree of resistance. So a 200K pot may produce a maximum resistance of 200,000 ohms.
- Because it offers a wide range for audio equipment, 100K potentiometers are the most prevalent kind on the market.
- These numbers are always immediately written on a pot. They’re usually on the other side of the terminals, directly close to the shaft.
- Tip: You need to know how much resistance a pot gives in order to determine whether or not it is acceptable for the task at hand. A 2,000 ohm pot won’t provide enough range for a stereo system, but it should enough for a dimmer switch.
3. Place your pot on a level surface so that the three terminals face you. Place your pot near to your electrical device on a level surface. If you know you’ll be installing the pot in a certain spot, start there. Turn the three terminals so that they face you. Remove any panels from your electrical equipment to reveal any input or output ports. If using a breadboard, place the pot on the uppermost set of rows, terminals facing you.
Before opening any panels or soldering any connections, unplug your electrical equipment. You don’t want to get electrocuted or permanently damage your device.
4. Measure and remove any wires that you want to use. To connect the terminals to the device, use any kind of soldering wire that is not acid-core. Measure each length of wire from the terminal to the device if you have an installation site lined up. Using wire cutters, strip any wires to expose the copper. Cut and remove 0.5–1 in (1.3–2.5 cm) of plastic off the tip of each wire using the notches on the cutter’s blades.
- Set your wire stripper to match the gauge of the wire to achieve a smooth strip.
- You’ll need to solder your wires, so prepare your soldering iron and flux on your work area.
- Plumbing makes use of acid-core soldering wire. It is incompatible with your gadgets.
- If you’re connecting a certain kind of electrical gadget that requires specialty wires, use them if the soldering wires fail.
Soldering Your Terminals
1. Connect a ground wire from terminal 1 on the left to the chassis. Tin a tiny piece of wire by tapping it with your soldering iron and flux on the exposed section. After the wire has absorbed some flux, lower it and attach it to the exposed metal section on terminal 1. To connect the wire to the terminal, press your soldering tip against the connector. The other end should be soldered to any exposed, unpainted metal surface of your electrical gadget.
- If you like, you may utilize terminal 3 on the right, but you’ll have to move the knob clockwise to reduce the signal.
- If you want to test your wires before soldering them, use a breadboard.
2. Connect your device’s output circuit to the center terminal. Tin another piece of wire in the same manner and attach it to the pot’s center terminal. Because this is where the signal enters the pot, it must be connected to the device’s output. Solder the wire to the metal connector on the rear of the output connection of your electrical gadget.
- The potentiometer’s input is connected to the center terminal. This indicates that the signal exits the electronic, enters terminal 2, and finally exits terminal 3. As a result, terminal 2 must be connected to the port that sends the device’s original signal out.
- This would imply connecting terminal 2 to the output jack of a guitar. This would imply connecting terminal 2 to the speaker output terminal of an integrated audio amplifier.
3. Connect terminal 3 to the device’s input. Terminal 3 is the output of the pot. It is the location where the pot delivers data back to the device. Tin a length of exposed soldering wire and put it immediately on the terminal. Connect the wire to the input port of your electrical gadget after heating it with your soldering pen. Look for the exposed metal aperture on the back of the knob or cable connector at the rear of the port. To attach the pot, solder the wire straight to it.
- Terminal 3 is where the signal from your pot exits, thus it must be linked to the spot where you wish to transmit the signal.
- This would imply connecting terminal 3 to the input jack of a guitar. Terminal 3 on an audio amplifier would be connected to the input channels.
Using Your Potentiometer
1. Using a voltmeter, check that your pot is operational. Connect the voltmeter’s terminals to the pot’s input and output terminals. To feed a signal, turn on the voltmeter and turn the dial. To modify the signal, turn the knob on top of your pot. If the signal reading on the voltmeter changes as you turn the knob, your potentiometer is operational.
If the voltmeter reports a signal from your pot yet the device does not operate when you switch your electronic on, there is a problem with the soldered connections.
2. Turn the shaft to adjust the signal on your smartphone. Turn on your electronic device and send a signal to the pot by playing music, striking a guitar note, or switching on a light. To reduce the volume or brightness, twist the shaft to the left. To increase the volume or intensity of light, twist the shaft to the right. To switch off the output, spin the shaft all the way to the left.
- You may now adjust the amount of resistance that your signal gets by using your pot.
- Turning the shaft all the way to the right will maximize the signal output to the extent that the pot permits. This output will not necessarily be the maximum signal that the device is capable of.
3. If you like, you may add a knob by sliding it over the potentiometer. If you like, you may install a potentiometer with the shaft naked and exposed. However, if you want to improve the look of your potentiometer, you may always add a knob. There are several knobs on the market that are meant to slip over the shaft of a pot and improve its appearance.
Look online or at an electronics shop to discover what possibilities are available for your specific make and model.
What are the 3 terminals on a potentiometer?
A potentiometer is a three-terminal variable resistor that may be adjusted manually. Two terminals are attached to opposing ends of a resistive element, while the third terminal is connected to a sliding contact, known as a wiper, that moves across the resistive element.
Which side of potentiometer is ground?
The ground is usually turned off, terminal 2 is the primary switch, and terminal 3 is a variable switch that may be changed. A potentiometer is often used to control and regulate an input signal.
What are the 3 legs on a potentiometer?
Take note of the potentiometer’s three legs. The outside legs provide power and ground, while the central leg serves as an input. This implies that depending on how far the knob is cranked, the value coming out of the third leg will fluctuate.
Can you wire a potentiometer backwards?
A potentiometer is just a resistor; current may flow in any direction via it (including from/to both ends to/from the wiper).
Why are there 3 pins on a potentiometer?
A three-terminal potentiometer is essentially a voltage divider when used with three terminals. As you move the wiper, one resistor in the voltage divider increases while the other decreases. A three-terminal pot is therefore a variable voltage divider.
Should potentiometer be grounded?
Anatech said that pot bodies should always be ground. They are meant to be grounded, as are the metal shafts. Otherwise, contacting the shaft or body of the control will cause a hum (or worse).