Contents
What is a potentiometer used for?
A potentiometer is a type of position sensor. They are used to measure displacement in any direction. Linear potentiometers linearly measure displacement and rotary potentiometers measure rotational displacement.
What is passive volume control?
A passive volume control is a passive device (no active electronics and therefore no power supply required) that replaces the traditional preamplifier. Today, many signal sources such as CD players have sufficient output level to drive most power amplifiers directly.
How does the volume work?
Volume is the intensity of a sound wave. It is directly related to amplitude, which is the height of a sound wave. Sound waves and ocean waves may be made of different things, but they work the same way. Changing the amplitude of a sound wave changes its loudness or intensity.
How do I control the volume on my external TV speakers?
Steps
- Press the HOME button, then select [Settings].
- Select [Sound] → [Headphone/Audio Out] → [Audio Out] → [Audio Out] in the sound setting menu → [Fixed] or [Variable]. Select [Fixed] to adjust the volume using the connected audio system’s remote control.
What can a potentiometer be used to control?
A potentiometer is a type of variable (adjustable) resistor. Potentiometers are widely used to control the output of electrical devices (e.g. volume of a radio or amplifier, speed of a toy or tool, lighting levels, etc.).
When to use a logarithmic potentiometer for volume?
Due to the logarithmic response of the human ear to sound pressure levels a logarithmic potentiometer is required to get a perceived even increase in volume with rotation. A 1 kΩ to 10 kΩ pot should be fine. If you use too high a value for the potentiometer the amplifier input impedance will load it excessively and distort the volume curve.
How to determine resistance for volume ( input side ) potentiometer?
To add a simple volume knob between the source (a phone or ipod) and the input jack of the amp, what is the logical process for determining a resistance value, and type (Lin/Log)? I have an amp that delivers 30W to each of the two (2) channels.
Can a pot over 80 Ω load the potentiometer?
Using the 10:1 rule any pot over 80 Ω would not load the output significantly. The amplifier input is typically >= 100 kΩ (but check the specifications). To prevent it loading the potentiometer too much we’ll drive it with a source impedance of <= 10 kΩ.