But they can be fixed, and herein I’ll show you how. Despite being one of the least complex and cheapest parts in the device in which they are used, they’re probably the most prone to failure and the cause of many volume-related faults in stereo equipment. In essence, the encoder is really just a fancy term for a digital knob. Fronting all of this is the rotary encoder – a tiny part that serves as a means to send user input to the digital brain behind these clever volume controls. Thus this change in resistance is handled not by an analogue part but by either an electronic implementation of a potentiometer, a microcontroller, a digital to analogue converter or even a series of relays switching banks of physical resistors. Many modern devices from the last 30 years or so have switched to digital control for their functions. To put it simply as a potentiometer is rotated its electrical resistance changes, thus changing the gain, or volume, of the amplifier. Traditionally the volume knob was an analogue device – a potentiometer, which is a type of variable resistor. If the volume on your stereo randomly turns up by itself, or doesn’t work at all, this article is for you. There’s a common issue that affects many amplifiers or integrated stereo systems with a digital volume control, where control of the volume on the front of the unit itself is via a physical Knob.
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