3269P-1-253LF

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Trimmer potentiometers are a type of adjustable resistor widely used as a variable voltage divider in multiple circuit applications. The 3269P-1-253LF is a trimmer potentiometer with a resistance of 1KΩ and tolerance of ±20%. It is a sealed, 3-terminal simple horizontal adjustment potentiometer, with an incremental resistance adjustment of up to 250Ω.

The most common application fields for the 3269P-1-253LF potentiometer are volume control and microphone preamplifiers. The preamplifier is a low-power amplifier integrated circuit that is used to amplify a weak signal from a microphone before sending it to the loudspeaker. The trimmer potentiometer can be used to adjust the gain and the frequency response of the microphone preamplifier, to get a better sound from the loudspeaker.

The working principle of the 3269P-1-253LF relies on a three-terminal circuit containing two fixed resistors in series. The third terminal is a movable contact that slides across both resistors, forming two potential dividers. The three terminals of the potentiometer are labeled as the positive, negative and sense terminals. The “sense” terminal is the moving contact or “wiper”. When the wiper is moved to increase resistance between the positive terminal and the sense terminal, the output voltage decreases. Conversely when the wiper is moved to decrease resistance between the positive terminal and the sense terminal the output voltage increases.

The resistance of the potentiometer can be adjusted by either turning a knob or by using a pair of tweezers to move the wiper. The adjustment range of the 3269P-1-253LF is ±20%, which is suitable for most general-purpose applications. It features a low temperature coefficient of resistance, low noise operation, and quick response.

In conclusion, the 3269P-1-253LF is a trimmer potentiometer with a resistance of 1KΩ and a tolerance of ±20%. It features a low temperature coefficient of resistance, low noise operation, and quick response which makes it suitable for multiple general-purpose applications such as volume control and microphone preamplifiers. It works on the principle of two fixed resistors in series, with the third being a movable contact or wiper whose position affects the output voltage.

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