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How do you get 12V DC to 9V DC with a pot and if it can be done what value pot?
Ovality1
The answer is a very-qualified "yes."
Assuming that you buffer the output (see below), any value potentiometer can be used to get 9V from 12V. Assuming a round, linear taper pot (see below), you will get 9V at the tap when you turn the knob approximately 1/4 of the way from maximum output.
A potentiometer (or "pot") is a 3 terminal device consisting of two "fixed contacts" at the ends of a (typically) wire-wound resistor and one "wiper contact" or "tap" that can be moved along the resistor.
If you apply a 12V source to the fixed contacts of a potentiometer, you will be able to adjust the tap to any voltage between 12V and 0V. In many applications, the tap serves as a reference value. This means that you don't load the tap directly but instead buffer it using an amplification stage to drive your load. If you apply the load directly to the tap, it will change the voltage value and generally make your design more complicated. In cases where the load is tied directly to the tap, the pot is often wired differently in a configuration called a rheostat.
When you choose your potentiometer, there are a few parameters you want to pay attention to:
1. The value of the potentiometer (e.g. 1K ohms) is the value of the resistance between the fixed contacts when the tap is left open. This value is important because it usually determines the amount of current drawn from the source. If you're replacing a potentiometer that has burned out, make sure to match this value with the one you're removing.
2. The power rating of the potentiometer (e.g. 0.5W) is how much power the potentiometer can dissipate safely. Make sure that the power rating is high enough for your application or it will burn out.
3. The taper of the potentiometer (e.g. linear or logarithmic) describes how the position of the tap changes with travel. Audio applications typically use a logarithmic potentiometer because our ears distinguish sound intensity logarithmically (something that sounds "twice as loud" is probably causing several powers of ten times as much energy to strike your eardrum). If you get the wrong taper, adjusting the potentiometer will feel "wrong" and either the change will be too great or not noticeable for most of the travel.
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∙ 14y ago
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What is meaning of 9v-0-9v transformer?
It is kind of transformers called center-tap transformer its main function is to transform primary voltage to 2 secondary voltages or vice versa. In your statement the transformer will convert the input voltage to 2 voltage each is 9v or the opposite it will convert the 2 input voltages with each 9v to a certain value depending on the turns ratio of the transformer.
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They might burn but they would be very dim and the battery would last for a very short time. They are 12 volt lights therefore it will take 12 volts for them to burn at the level of brightness that they should.
What is meaning of 9v-0-9v transformer?
It is kind of transformers called center-tap transformer its main function is to transform primary voltage to 2 secondary voltages or vice versa. In your statement the transformer will convert the input voltage to 2 voltage each is 9v or the opposite it will convert the 2 input voltages with each 9v to a certain value depending on the turns ratio of the transformer.
