How do you choose a potentiometer resistance?
In general, you want the potentiometer to be as small as possible without putting too much of a load on the source. A quick rule of thumb for selecting the resistance of a potentiometer is that you want the input impedance to be an order of magnitude (10 times) higher than the output (source) impedance.
What is the resistance range of a potentiometer?
Potentiometers with R = 10Ω have 0-10Ω range. It’s always from 0 to nominal R (+/- tolerance). Typical potentiometer (and other basic electronic parts) values are defined in IEC 60063. There are few number series – E6 and E12 are very common.
How to select resistance of a potentiometer circuit?
Use Paint if you need to. The pot you tried is likely a taper pot. You want a linear. At 12V, your going to drop ~.6 v across the diode, so 11.4v/.33amp gives you about 34 ohm, which will be your current limiting resistor.
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.
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 can I check the resistance of my pot?
You can check the resistance of your Pot by taking an ohm reading of the two outside lugs. The Pot is the foundation for all the possibilities you can achieve. From Volume Pots to Tone Pots – let’s check out a few variations to see how we get many uses from one pot: WHICH POT TO CHOOSE? 250K OR 500K?