The DS1669 is an electronic digital rheostat manufactured by Dallas Semiconductor. This component has a function similar to digital variable resistor/potensiometer which can be operated by push the buttons.
You can adjust the audio volume, LCD contrast, frequency, etc. by using two buttons instead of a common potentiometer/trimpot. This circuit explains how we do it with IC DS1669 IC. This IC is very popular and is widely used because it is a variable resistor that never wears down. By using S1 and S2 push buttons you can adjust the resistance. C1 is only a 0.1uF ceramic capacitor. You can use the datasheet of IC DS1669 to get more detailed information.
DS1669 Digital Variable Resistor Features:
DS1669-10 ~ 10 k?
DS1669-50 ~ 50 k?
DS1669-100 ~ 100 k?
Download the Digital Variable Resistor DS1669 Datasheet:
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very good