3290W-1-100

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Trimmer Potentiometers

A trimmer potentiometer is a type of potentiometer consisting of three terminals and a sliding or rotating contact that forms an adjustable voltage divider. Also called a variable resistor, trimmer potentiometers are often used to fine-tune circuits and to adjust output voltages. When used as part of a circuit, the position of the three terminals on the circuit board create a manually adjustable voltage divider network. The position of the rotary or sliding contact determines the voltage ratio between the two outer terminals and the center terminal.

The 3290W-1-100 is a trimmer potentiometer with a single-turn adjustment that features a threaded bushing and is suitable for panel-mounting. It has a linear taper, with a full range of resistance values between 10 ohms and 10 kilo-ohms. The 3290W-1-100 is a versatile part, and can be used in a range of different circuits and applications, including audio, auto-sensing and RF applications.

Application Field

Trimmer potentiometers are used in a wide range of applications, including:

• Volume control in audio circuits.
• Adjusting frequency in RF circuits.
• Calibration & adjustment in test equipment.
• Balancing & trimming in motor control systems.
• Set-point adjustment in automatic control systems.

The 3290W-1-100 is particularly suitable for applications such as speaker crossover networks, wattage boosters, feedback systems, solenoid valve controllers, sensors and portable audio devices.

Working Principle

Trimmer potentiometers work on the principle of electrical resistance. They are wired in a resistive mid-point circuit, where the resistance of the potentiometer is connected across two points, one being connected to a power supply and the other point is connected to the load. The middle point is usually connected to a variable input, like a knob, which controls the resistance between the two terminals. As the knob is adjusted, the voltage ratio between the two ends of the resistor changes and the output voltage is adjusted accordingly.

The 3290W-1-100 is a linear taper potentiometer, which means that the resistance between the two output terminals varies in a linear fashion as the knob is adjusted. It can be used to adjust the output of any voltage-controlled device, including amplifiers, equalizers, and oscillators. It is also useful for controlling the gain of audio signals, and can be used to adjust the frequency of an RF circuit.

The 3290W-1-100 is a particularly reliable and durable trimmer potentiometer, with a threaded bushing offering smooth, precise adjustment. Its linear taper eliminates the need for complex calculations when setting new parameters, and makes it simpler to set up for a variety of applications.

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