# What is meant by negative voltage regulation

Linear Regulators with Negative Voltages

Positive and negative voltage regulation. Ask Question could I put power into one of the modules with the voltage reversed? Sure, but that will mean instant death for the module. The capacitors will not have time to blow up. I have been reading about inverter circuits to try and get a negative voltage however I am having little luck. Regulation is the description of how output voltage falls as load increases. it will always fall because copper and iron losses increase with load (principally the copper losses) Negative regulation would imply voltage going up as load increased. That is not the way passive devices behave.

What are negative voltages? With voltages, everything is relative. Between different electrical conductors, there can be different electric potentials. This means that one voltage can be higher than another voltage. Figure 1 shows an example with a supply voltage of 3.

In such a system, the signals of a sensor shall be measured and recorded. For the necessary negative voltage of —3. This voltage rail may come from a transformer-based power supply. Typically, such voltages are not regulated very accurately. For accurate —3. There is a very large selection of linear regulators available on the market suited for positive voltages. Can such a positive linear regulator be used in applications where negative voltages need to be converted?

Figure 1 shows a linear regulator used in such an application. The problem with using a typical linear regulator that is intended for positive output voltages is that it can only source current and not sink current. If we were to select a positive linear regulator that can source and sink currents, there would still be an issue with this setup. The adjustable resistor stands for the pass element of a linear regulator.

However, there are several disadvantages to using a positive linear regulator in such an environment. The circuit will use the resistive divider to regulate the output voltage based on the —5 V rail and not based on the 0 V rail, system ground. This causes disturbances and noise on the —5 V rail to couple directly onto the generated —3. Also, the regulation accuracy is rather poor. If some sequencing amongst different voltages needs to be observed in the system, some sort of level shifting might be necessary.

In Figure 2, the same system is shown, but a linear regulator is used that was specifically designed to step down negative voltages. These ICs are specifically called negative linear regulators. This makes the part very useful for how to file for baby bonding in california applications to power sensitive nodes.

If a negative linear regulator, like the how to do a mathematical proof shown in Figure 2, is being used, the generated —3.

This yields a very low noise and accurate output voltage. This makes special negative linear regulators very necessary when converting negative voltages or when filtering negative voltages.

Generally there is only a limited supply of negative linear regulators available on the market. By the way—why an LDO regulator? You are still using the standard to get a stable 5 V output? Well you need 7 V minimum input voltage for the Tip: Check the data sheet of the ADP Frederik Dostal studied microelectronics at the University of Erlangen in Germany.

Starting work in the power management business inhe has been active in various applications positions including four years in Phoenix, Arizona, where he worked on switch-mode power supplies. JUL

Simple answer: You would get 5V in your case, but referenced to V instead of ground. In other words, you would have -7V, not -5V. In addition, the regulator would only source current onto the -7V rail, not sink it as would be expected for a negative voltage. Jun 10,  · Voltage regulators are very common in electronic circuits. They provide a constant output voltage for a varied input voltage. In our case the IC is an negative 5V regulator, meaning it provides -5V as output. Negative Regulation The binding of a specific protein (repressor) inhibits transcription from occurring. DNA bound repressors often act to prevent RNA polymerase from binding to the promoter, or by blocking the movement of RNA polymerase. In order to be effective, activators and repressors must be able to exist in 2 states.

What does it mean that John is 1. Could you find his height by only looking at his head? You have to compare the top of his head to the ground he is standing on to be able to find his height. That John is 1. In a simple battery circuit, the ground point is usually the minus terminal of the battery.

Therefore the position of his feet becomes negative. Remember — a battery being 9V means the plus terminal is 9V higher than the minus terminal. What happens if we connect the plus of the second battery to the minus of the first one i. Nothing really happens with the batteries. Since the minus is 9V lower than the plus, and since the plus is connected to ground, the minus would have to be minus 9V. One example where you get negative voltage is in the astable multivibrator circuit.

This is very common for amplifier circuits. It would have been the exact same thing, just with different names. If you find these lessons useful, you should check out Ohmify. And there are a bunch of project plans you can follow to build cool things like robots, traffic lights, amplifiers, a kitchen timer, music synthesizers and more. This is the most easiest lesson I have ever seen. Very easy to understand and simple. It is good for every beginner who likes electronics. Voltage is a measurement that is always done between two points.

So when you connect two 9V batteries, you get 18V between the two ends, yes. Between the middle point to the positive terminal, you get 9V. And from the middle point to the negative terminal, you get minus 9V. The difference between 0V and 18V is also 18V. Your email address will not be published. Meet John.

He is 1. Comments easy to understand. I recommend this site for all beginners. Thank you. Warm Regards, Sudesh. This is a really interesting way of explaining it! Thanks for sharing. So do the electrons flow in the same direct in the second battery? Yes, the electrons flow in the same direction in both batteries. So we have created a negative voltage of 9V.

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